Jemperli (Dostarlimab) Package Insert

1 INDICATIONS AND USAGE

1.1 Endometrial Cancer

JEMPERLI, in combination with carboplatin and paclitaxel, followed by JEMPERLI as a single agent, is indicated for the treatment of adult patients with primary advanced or recurrent endometrial cancer (EC).

JEMPERLI, as a single agent, is indicated for the treatment of adult patients with mismatch repair deficient (dMMR) recurrent or advanced EC, as determined by an FDA‑authorized test, that has progressed on or following prior treatment with a platinum‑containing regimen in any setting and are not candidates for curative surgery or radiation [see Dosage and Administration (2.1)].

1.2 Microsatellite Instability-High or Mismatch Repair Deficient Locally Advanced Rectal Cancer

JEMPERLI, as a single agent, is indicated for the treatment of adult patients with Stage II/III, locally advanced rectal cancer (LARC) that is microsatellite instability‑high (MSI‑H) or dMMR, as determined by an FDA‑authorized test for solid tumors [see Dosage and Administration (2.1)]. This indication is approved under accelerated approval based on sustained clinical complete response for 12 months [see Clinical Studies (14.2)]. The long-term risk of relapse is unknown, with additional follow-up expected. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial(s).

1.3 Mismatch Repair Deficient Recurrent or Advanced Solid Tumors

JEMPERLI, as a single agent, is indicated for the treatment of adult patients with dMMR recurrent or advanced solid tumors, as determined by an FDA‑authorized test, that have progressed on or following prior treatment and who have no satisfactory alternative treatment options [see Dosage and Administration (2.1)]. This indication is approved under accelerated approval based on tumor response rate and durability of response [see Clinical Studies (14.3)]. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial(s).

2 DOSAGE AND ADMINISTRATION

2.1 Patient Selection

Single Agent

Select patients for treatment with JEMPERLI as a single agent based on the presence of MSI-H and/or dMMR in tumor specimens in:

• recurrent or advanced EC [see Clinical Studies (14.1)].
• LARC [see Clinical Studies (14.2)].
• recurrent or advanced solid tumors [see Clinical Studies (14.3)].

Information on FDA‑authorized tests for the detection of MSI‑H/dMMR status is available at https://www.fda.gov/companiondiagnostics.

Because the effect of prior chemotherapy on test results for dMMR in patients with high‑grade gliomas is unclear, it is recommended to test for this marker in the primary tumor specimen obtained prior to initiation of temozolomide chemotherapy in patients with high‑grade gliomas.

2.2 Recommended Dosage

The recommended dosage for JEMPERLI is presented in Table 1.

Administer JEMPERLI as a 30-minute intravenous infusion [see Dosage and Administration (2.4)].

Table 1. Recommended Dosage of JEMPERLI

2.3 Dosage Modifications for Adverse Reactions

No dose reductions of JEMPERLI are recommended. In general, withhold JEMPERLI for severe (Grade 3) immune‑mediated adverse reactions. Permanently discontinue JEMPERLI for life‑threatening (Grade 4) immune‑mediated adverse reactions, recurrent severe (Grade 3) immune‑mediated reactions that require systemic immunosuppressive treatment, or an inability to reduce corticosteroid dose to 10 mg or less of prednisone equivalent per day within 12 weeks of initiating steroids.

Dosage modifications for JEMPERLI for adverse reactions that require management different from these general guidelines are summarized in Table 2.

Table 2. Recommended Dosage Modifications for Adverse Reactions

2.4 Preparation and Administration

Preparation for Intravenous Infusion

• Visually inspect the solution for particulate matter and discoloration. The solution is clear to slightly opalescent, colorless to yellow. Discard the vial if visible particles are observed.
• Do not shake.
• JEMPERLI is compatible with an infusion bag made of polyolefin, ethylene vinyl acetate, or polyvinyl chloride with di(2-ethylhexyl) phthalate (DEHP).
• For the 500-mg dose, withdraw 10 mL of JEMPERLI from a vial using a disposable sterile syringe made of polypropylene and dilute into an intravenous infusion bag containing 0.9% Sodium Chloride Injection, USP or 5% Dextrose Injection, USP to a final concentration between 2 to 10 mg/mL (maximum 250 mL).
• For the 1,000-mg dose, withdraw 10 mL from each of 2 vials (withdraw 20 mL total) and dilute into an intravenous bag containing 0.9% Sodium Chloride Injection, USP or 5% Dextrose Injection, USP to a final concentration between 4 to 10 mg/mL (maximum 250 mL).
• Mix diluted solution by gentle inversion. Do not shake.
• Discard any unused portion left in the vial.

Storage of Infusion Solution

Store in the original carton until time of preparation in order to protect from light. The prepared dose may be stored either:

• At room temperature for no more than 6 hours from the time of preparation until the end of infusion.
• Under refrigeration at 2°C to 8°C (36ºF to 46ºF) for no more than 24 hours from time of preparation until end of infusion. If refrigerated, allow the diluted solution to come to room temperature prior to administration.

Discard after 6 hours at room temperature or after 24 hours under refrigeration.

Do not freeze.

Administration

Administer infusion solution intravenously over 30 minutes through an intravenous line using tubing made of polyvinyl chloride or platinum cured silicone; fittings made of polyvinyl chloride or polycarbonate; and a sterile, non‑pyrogenic, low‑protein binding, 0.2‑micron, in‑line or add‑on filter.

JEMPERLI must not be administered as an intravenous push or bolus injection. Do not co‑administer other drugs through the same infusion line.

3 DOSAGE FORMS AND STRENGTHS

Injection: 500 mg/10 mL (50 mg/mL) clear to slightly opalescent, colorless to yellow solution in a single-dose vial for intravenous infusion after dilution.

4 CONTRAINDICATIONS

None.

5 WARNINGS AND PRECAUTIONS

5.1 Severe and Fatal Immune-Mediated Adverse Reactions

JEMPERLI is a monoclonal antibody that belongs to a class of drugs that bind to either the programmed death receptor-1 (PD-1) or PD-ligand 1 (PD-L1), blocking the PD-1/PD-L1 pathway, thereby removing inhibition of the immune response, potentially breaking peripheral tolerance, and inducing immune-mediated adverse reactions. Important immune-mediated adverse reactions listed in WARNINGS AND PRECAUTIONS may not include all possible severe and fatal immune‑mediated reactions.

Immune-mediated adverse reactions, which can be severe or fatal, can occur in any organ system or tissue. Immune‑mediated adverse reactions can occur at any time after starting a PD-1/PD-L1–blocking antibody. While immune-mediated adverse reactions usually manifest during treatment with PD-1/PD-L1–blocking antibodies, they can also manifest after discontinuation of PD-1/PD-L1–blocking antibodies.

Early identification and management of immune-mediated adverse reactions are essential to ensure safe use of PD‑1/PD‑L1–blocking antibodies. Monitor closely for symptoms and signs that may be clinical manifestations of underlying immune-mediated adverse reactions. Evaluate liver enzymes, creatinine, and thyroid function tests at baseline and periodically during treatment. In cases of suspected immune-mediated adverse reactions, initiate appropriate workup to exclude alternative etiologies, including infection. Institute medical management promptly, including specialty consultation as appropriate.

Withhold or permanently discontinue JEMPERLI depending on severity [see Dosage and Administration (2.3)]. In general, if JEMPERLI requires interruption or discontinuation, administer systemic corticosteroids (1 to 2 mg/kg/day prednisone or equivalent) until improvement to Grade 1 or less. Upon improvement to Grade 1 or less, initiate corticosteroid taper and continue to taper over at least 1 month. Consider administration of other systemic immunosuppressants in patients whose immune-mediated adverse reaction is not controlled with corticosteroids.

Toxicity management guidelines for adverse reactions that do not necessarily require systemic steroids (e.g., endocrinopathies, dermatologic reactions) are discussed below.

Immune-Mediated Pneumonitis

JEMPERLI can cause immune‑mediated pneumonitis, which can be fatal. In patients treated with other PD‑1/PD‑L1–blocking antibodies, the incidence of pneumonitis is higher in patients who have received prior thoracic radiation.

Immune‑mediated pneumonitis occurred in 2% (15/759) of patients receiving JEMPERLI as a single agent, including Grade 2 (1.2%), Grade 3 (0.7%), and Grade 4 (0.1%) pneumonitis. Pneumonitis led to discontinuation of JEMPERLI in 1.1% of patients.

Systemic corticosteroids were required in 80% (12/15) of patients with pneumonitis. Pneumonitis resolved in 12 of the 15 patients. JEMPERLI was withheld for 9 patients. Five patients reinitiated JEMPERLI after symptom improvement; of these, 2 patients had recurrence of pneumonitis.

Immune‑Mediated Colitis

JEMPERLI can cause immune‑mediated colitis. Cytomegalovirus infection/reactivation have occurred in patients with corticosteroid‑refractory immune‑mediated colitis treated with PD‑1/PD‑L1–blocking antibodies. In cases of corticosteroid‑refractory colitis, consider repeating infectious workup to exclude alternative etiologies.

Immune‑mediated colitis occurred in 1.2% (9/759) of patients receiving JEMPERLI as a single agent, including Grade 2 (0.7%) and Grade 3 (0.5%) adverse reactions. Colitis led to discontinuation of JEMPERLI in 1 (0.1%) patient.

Systemic corticosteroids were required in 78% (7/9) of patients with colitis. Colitis resolved in 5 of the 9 patients. Of the 4 patients in whom JEMPERLI was withheld for colitis, all reinitiated treatment with JEMPERLI; of these, 1 patient had recurrence of colitis.

Immune‑Mediated Hepatitis

JEMPERLI can cause immune‑mediated hepatitis, which can be fatal.

Immune‑mediated hepatitis occurred in 0.5% (4/759) of patients receiving JEMPERLI as a single agent; all were Grade 3. Hepatitis led to discontinuation of JEMPERLI in 2 (0.3%) patients. Systemic corticosteroids were required in 3 patients with hepatitis and the events resolved in 1 of the 4 patients.

Immune‑Mediated Endocrinopathies

Adrenal Insufficiency: JEMPERLI can cause primary or secondary adrenal insufficiency. For Grade 2 or higher adrenal insufficiency, initiate symptomatic treatment per institutional guidelines, including hormone replacement as clinically indicated. Withhold or permanently discontinue JEMPERLI depending on severity [see Dosage and Administration (2.3)].

Adrenal insufficiency occurred in 1.1% (8/759) patients receiving JEMPERLI as a single agent, including Grade 2 (0.4%) and Grade 3 (0.7%). Adrenal insufficiency resulted in discontinuation in 1 (0.1%) patient and resolved in 5 of the 8 patients. Of the 4 patients in whom JEMPERLI was withheld for adrenal insufficiency, all reinitiated treatment with JEMPERLI. Systemic corticosteroids were required in 6 of the 8 patients with adrenal insufficiency.

Hypophysitis: JEMPERLI can cause immune-mediated hypophysitis. Hypophysitis can present with acute symptoms associated with mass effect such as headache, photophobia, or visual field cuts. Hypophysitis can cause hypopituitarism. Initiate hormone replacement as clinically indicated. Withhold or permanently discontinue JEMPERLI depending on severity [see Dosage and Administration (2.3)].

JEMPERLI in Combination with Carboplatin and Paclitaxel: Hypophysitis (Grade 3) occurred in 0.4% (1/241) of patients receiving JEMPERLI in combination with carboplatin and paclitaxel. Systemic corticosteroids were required, and the event resolved. JEMPERLI was withheld and the patient reinitiated treatment.

JEMPERLI as a Single Agent: Hypophysitis (Grade 2) occurred in 0.3% (2/759) of patients receiving JEMPERLI as a single agent. Systemic corticosteroids were required in both patients, and in 1 patient, thyroid replacement therapy was also required; neither event resolved. JEMPERLI was withheld in 1 patient and the patient reinitiated treatment.

Thyroid Disorders: JEMPERLI can cause immune-mediated thyroid disorders. Thyroiditis can present with or without endocrinopathy. Hypothyroidism can follow hyperthyroidism. Initiate thyroid hormone replacement or medical management of hyperthyroidism as clinically indicated. Withhold or permanently discontinue JEMPERLI depending on severity [see Dosage and Administration (2.3)].

Thyroiditis: Thyroiditis occurred in 0.4% (3/759) of patients receiving JEMPERLI as a single agent; all were Grade 2. Systemic corticosteroids were required in 1 of 3 patients and anti‑thyroid therapy was required for 2 of 3 patients with thyroiditis. JEMPERLI was withheld for 1 patient and the patient reinitiated treatment. None of the events of thyroiditis resolved; there were no discontinuations of JEMPERLI due to thyroiditis.

Hypothyroidism: JEMPERLI in Combination with Carboplatin and Paclitaxel: Hypothyroidism occurred in 12% (30/241) of patients receiving JEMPERLI in combination with carboplatin and paclitaxel, all of which were Grade 2. Hypothyroidism led to discontinuation of JEMPERLI in 1 patient and resolved in 23% (7/30) of patients. JEMPERLI was withheld for 5 patients and all reinitiated treatment with JEMPERLI. Thyroid hormone replacement was required for 27 of the 30 patients with hypothyroidism.

JEMPERLI as a Single Agent: Hypothyroidism occurred in 8% (58/759) of patients receiving JEMPERLI as a single agent, all of which were Grade 2. Hypothyroidism did not lead to discontinuation of JEMPERLI and resolved in 33% (19/58) of patients. JEMPERLI was withheld for 2 patients and both reinitiated treatment. Thyroid hormone replacement therapy was required for 57 of the 58 patients with hypothyroidism.

Hyperthyroidism: JEMPERLI in Combination with Carboplatin and Paclitaxel: Hyperthyroidism occurred in 3.3% (8/241) of patients receiving JEMPERLI in combination with carboplatin and paclitaxel, including Grade 2 (2.9%) and Grade 3 (0.4%). Hyperthyroidism did not lead to discontinuation of JEMPERLI and resolved in 75% (6/8) of patients. JEMPERLI was withheld for 1 patient and the patient reinitiated treatment. Anti-thyroid therapy was required for 2 of the 8 patients while systemic corticosteroids were required for 1 of the 8 patients with hyperthyroidism.

JEMPERLI as a Single Agent: Hyperthyroidism occurred in 2.2% (17/759) of patients receiving JEMPERLI as a single agent, including Grade 2 (2.1%) and Grade 3 (0.1%). Hyperthyroidism did not lead to discontinuation of JEMPERLI and resolved in 76% (13/17) of patients. JEMPERLI was withheld for 2 patients and both reinitiated treatment. Anti‑thyroid therapy was required for 12 of the 17 patients with hyperthyroidism.

Type 1 Diabetes Mellitus, Which Can Present with Diabetic Ketoacidosis: JEMPERLI can cause type 1 diabetes mellitus, which can present with diabetic ketoacidosis. Monitor patients for hyperglycemia or other signs and symptoms of diabetes. Initiate treatment with insulin as clinically indicated. Withhold or permanently discontinue JEMPERLI depending on severity [see Dosage and Administration (2.3)].

JEMPERLI in Combination with Carboplatin and Paclitaxel: Type 1 diabetes mellitus (Grade 3) occurred in 0.4% (1/241) of patients receiving JEMPERLI in combination with carboplatin and paclitaxel. Type 1 diabetes mellitus led to withholding JEMPERLI; the patient reinitiated treatment and required long-term insulin therapy.

JEMPERLI as a Single Agent: Type 1 diabetes mellitus occurred in 0.1% (1/759) of patients receiving JEMPERLI as a single agent, which was Grade 3. Type 1 diabetes mellitus did not result in treatment discontinuation and did not resolve.

Immune-Mediated Nephritis with Renal Dysfunction

JEMPERLI can cause immune‑mediated nephritis, which can be fatal. Nephritis, including tubulointerstitial nephritis, occurred in 0.4% (3/759) of patients receiving JEMPERLI as a single agent; all were Grade 2. Nephritis led to discontinuation of JEMPERLI in 1 (0.1%) patient and resolved in all patients. JEMPERLI was withheld for 1 patient and the patient reinitiated treatment. Systemic corticosteroids were required in 2 of the 3 patients experiencing nephritis.

Immune‑Mediated Dermatologic Adverse Reactions

JEMPERLI can cause immune‑mediated rash or dermatitis. Bullous and exfoliative dermatitis, including Stevens‑Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), and drug rash with eosinophilia and systemic symptoms (DRESS), have occurred with PD‑1/PD‑L1–blocking antibodies. One patient receiving JEMPERLI experienced Grade 3 SJS, which resolved. Topical emollients and/or topical corticosteroids may be adequate to treat mild to moderate non‑bullous/exfoliative rashes. Withhold or permanently discontinue JEMPERLI depending on severity [see Dosage and Administration (2.3)].

Other Immune‑Mediated Adverse Reactions

The following clinically significant immune‑mediated adverse reactions occurred in <1% of the 759 patients treated with JEMPERLI or were reported with the use of other PD‑1/PD‑L1–blocking antibodies. Severe or fatal cases have been reported for some of these adverse reactions.

Nervous System: Meningitis, encephalitis, myelitis and demyelination, myasthenic syndrome/myasthenia gravis, Guillain‑Barré syndrome, nerve paresis, autoimmune neuropathy.

Cardiac/Vascular: Myocarditis, pericarditis, vasculitis.

Ocular: Uveitis, iritis, other ocular inflammatory toxicities. Some cases can be associated with retinal detachment. Various grades of visual impairment to include blindness can occur. If uveitis occurs in combination with other immune‑mediated adverse reactions, consider a Vogt‑Koyanagi‑Harada–like syndrome, as this may require treatment with systemic steroids to reduce the risk of permanent vision loss.

Gastrointestinal: Pancreatitis, including increases in serum amylase and lipase levels, gastritis, duodenitis.

Musculoskeletal and Connective Tissue: Myositis/polymyositis, rhabdomyolysis and associated sequelae including renal failure, arthritis, polymyalgia rheumatica.

Endocrine: Hypoparathyroidism.

Hematologic/Immune: Autoimmune hemolytic anemia, aplastic anemia, hemophagocytic lymphohistiocytosis, systemic inflammatory response syndrome, histiocytic necrotizing lymphadenitis (Kikuchi lymphadenitis), sarcoidosis, immune thrombocytopenia, solid organ transplant rejection, other transplant (including corneal graft) rejection.

Other: Myocarditis-Myositis-Myasthenia Gravis (or Myasthenia-Like) Overlap Syndrome, reported as the co-occurrence of either two or all three adverse reactions.

5.2 Infusion-Related Reactions

Severe or life‑threatening infusion‑related reactions have been reported with PD‑1/PD‑L1–blocking antibodies. Severe infusion‑related reactions (Grade 3) occurred in 0.1% (1/759) of patients receiving JEMPERLI as a single agent. All patients recovered from the infusion‑related reactions.

Monitor patients for signs and symptoms of infusion-related reactions. Interrupt or slow the rate of infusion or permanently discontinue JEMPERLI based on severity of reaction [see Dosage and Administration (2.3)].

5.3 Complications of Allogeneic HSCT

Fatal and other serious complications can occur in patients who receive allogeneic hematopoietic stem cell transplantation (HSCT) before or after being treated with a PD-1/PD-L1–blocking antibody. Transplant-related complications include hyperacute graft-versus-host disease (GVHD), acute GVHD, chronic GVHD, hepatic veno-occlusive disease after reduced intensity conditioning, and steroid-requiring febrile syndrome (without an identified infectious cause). These complications may occur despite intervening therapy between PD-1/PD-L1 blockade and allogeneic HSCT.

Follow patients closely for evidence of transplant-related complications and intervene promptly. Consider the benefit versus risks of treatment with a PD-1/PD-L1–blocking antibody prior to or after an allogeneic HSCT.

5.4 Embryo-Fetal Toxicity

Based on its mechanism of action, JEMPERLI can cause fetal harm when administered to a pregnant woman. Animal studies have demonstrated that inhibition of the PD‑1/PD‑L1 pathway can lead to increased risk of immune‑mediated rejection of the developing fetus, resulting in fetal death. Advise pregnant women of the potential risk to a fetus. Advise women of reproductive potential to use effective contraception during treatment with JEMPERLI and for 4 months after the last dose [see Use in Specific Populations (8.1, 8.3)].

6 ADVERSE REACTIONS

The following clinically significant adverse reactions are described elsewhere in the labeling:

• Severe and fatal immune-mediated adverse reactions [see Warnings and Precautions (5.1)]
• Infusion-related reactions [see Warnings and Precautions (5.2)]

6.1 Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared with rates in the clinical trials of another drug and may not reflect the rates observed in practice.

The pooled safety described in WARNINGS AND PRECAUTIONS reflects exposure to JEMPERLI as a single agent in 759 patients in two non‑randomized, single-arm, open‑label trials; the multicohort GARNET trial (n = 605, patients with advanced or recurrent EC or other solid tumors) and the AZUR-1 trial (n = 154, patients with LARC). The data described in WARNINGS AND PRECAUTIONS also reflects exposure to JEMPERLI in combination with carboplatin and paclitaxel in 241 patients with primary advanced or recurrent EC in the randomized, double-blind active‑control RUBY trial.

Primary Advanced or Recurrent Endometrial Cancer: JEMPERLI in Combination with Carboplatin and Paclitaxel

The safety of JEMPERLI in patients with primary advanced or recurrent EC was evaluated in RUBY [see Clinical Studies (14.1)]. Patients received JEMPERLI 500 mg (n = 241) or placebo (n = 246) in combination with carboplatin and paclitaxel every 3 weeks for 6 cycles followed by JEMPERLI 1,000 mg or placebo every 6 weeks until disease progression or unacceptable toxicity. Among the 241 patients, 38.6% were exposed for >1 year and 24.1% were exposed for >2 years.

Serious adverse reactions occurred in 39% of patients receiving JEMPERLI in combination with carboplatin and paclitaxel; the most common serious adverse reactions were sepsis, including urosepsis (3.7%), and pulmonary embolism (3.3%). Fatal adverse reactions occurred in 1.2% of patients receiving JEMPERLI including septic shock (0.8%) and myelosuppression (0.4%).

In patients receiving JEMPERLI in combination with carboplatin and paclitaxel, JEMPERLI was permanently discontinued due to adverse reactions in 46 patients (19%). Adverse reactions that required permanent discontinuation in ≥2 patients included 3 cases (1.2%) of rash maculo-papular, and 2 cases (0.8%) each of increased alanine aminotransferase (ALT), increased aspartate aminotransferase (AST), diarrhea, pancreatitis, fatigue, pneumonitis, and arthralgia.

Dosage interruptions due to an adverse reaction occurred in 37% of patients who received JEMPERLI in combination with carboplatin and paclitaxel. Adverse reactions that required dosage interruption in ≥5% of patients who received JEMPERLI in combination with carboplatin and paclitaxel were anemia, thrombocytopenia, and peripheral neuropathy.

The most common adverse reactions, including laboratory abnormalities (≥20%), were decreased hemoglobin, increased creatinine, peripheral neuropathy, decreased white blood cell count, fatigue, nausea, alopecia, decreased platelets, increased glucose, decreased lymphocytes, decreased magnesium, decreased neutrophils, increased AST, arthralgia, rash, constipation, diarrhea, increased ALT, decreased potassium, decreased albumin, decreased sodium, increased alkaline phosphatase, abdominal pain, dyspnea, decreased appetite, increased amylase, decreased phosphate, urinary tract infection, and vomiting.

Table 3 summarizes the adverse reactions that occurred in ≥20% of patients with primary advanced or recurrent EC receiving JEMPERLI in combination with carboplatin and paclitaxel in RUBY.

Table 3. Adverse Reactions (≥20%) in Patients with Endometrial Cancer Who Received JEMPERLI with Carboplatin and Paclitaxel in RUBY

Clinically relevant adverse reactions in <20% of patients with primary advanced or recurrent EC who received JEMPERLI in combination with carboplatin and paclitaxel included:

Endocrine Disorders: Hypothyroidism, hyperthyroidism, thyroiditis, adrenal insufficiency.

Eye Disorders: Keratitis, uveitis.

Gastrointestinal Disorders: Colitis, pancreatitis.

Metabolism and Nutrition Disorders: Type 1 diabetes mellitus.

Musculoskeletal and Connective Tissue Disorders: Immune-mediated arthritis.

Respiratory, Thoracic, and Mediastinal Disorders: Pneumonitis.

Cardiac Disorders: Myocarditis.

Nervous System Disorders: Encephalopathy.

Vascular Disorders: Hypertension, hemorrhage.

Table 4 summarizes the laboratory abnormalities in patients with primary advanced or recurrent EC receiving JEMPERLI in combination with carboplatin and paclitaxel in RUBY.

Table 4. Select Laboratory Abnormalities that Worsened from Baseline Occurring in ≥20% of Patients with Endometrial Cancer Receiving JEMPERLI with Carboplatin and Paclitaxel in RUBY

Mismatch Repair Deficient Recurrent or Advanced Endometrial Cancer: JEMPERLI as a Single Agent

The safety of JEMPERLI was evaluated in GARNET in 150 patients with advanced or recurrent dMMR EC who received at least 1 dose of JEMPERLI [see Clinical Studies (14.1)]. Patients received JEMPERLI 500 mg every 3 weeks for 4 cycles followed by 1,000 mg every 6 weeks as an intravenous infusion until disease progression or unacceptable toxicity. Patients with autoimmune disease that required systemic therapy within 2 years of treatment or a medical condition that required immunosuppression were ineligible. Among patients receiving JEMPERLI, 41% were exposed for >1 year and 23% were exposed for >2 years.

A fatal adverse reaction occurred in one patient (0.7%) who received JEMPERLI, due to concurrent immune-mediated encephalitis and urinary tract infection.

Serious adverse reactions occurred in 38% of patients receiving JEMPERLI. Serious adverse reactions in >2% of patients included urinary tract infection (4%), sepsis (3.3%), acute kidney injury (2.7%), and abdominal pain (2.7%).

JEMPERLI was permanently discontinued due to adverse reactions in 15 (10%) patients, including increased transaminases, sepsis, bronchitis, pneumonitis, rash, pruritus, pancreatitis, encephalitis, and nephritis. Dosage interruptions due to an adverse reaction occurred in 28% of patients who received JEMPERLI. Adverse reactions that required dosage interruption in >1% of patients who received JEMPERLI were anemia, diarrhea, asthenia, colitis, sepsis, and pneumonitis.

The most common adverse reactions (≥20%) were fatigue/asthenia, anemia, nausea, diarrhea, constipation, vomiting, and rash.

Table 5 summarizes the adverse reactions that occurred in ≥10% of patients with dMMR EC on JEMPERLI in GARNET.

Table 5. Adverse Reactions (≥10%) in Patients with dMMR Endometrial Cancer Who Received JEMPERLI in GARNET

Clinically relevant adverse reactions in <10% of patients who received JEMPERLI included:

Endocrine Disorders: Hyperthyroidism, adrenal insufficiency, hypophysitis.

Eye Disorders: Iridocyclitis, uveitis.

Gastrointestinal Disorders: Colitis, pancreatitis, enterocolitis, gastritis.

General Disorders and Administration Site Conditions: Chills.

Musculoskeletal and Connective Tissue Disorders: Immune-mediated myositis, immune-mediated arthritis.

Nervous System Disorders: Encephalitis.

Renal and Urinary Disorders: Nephritis.

Respiratory, Thoracic, and Mediastinal Disorders: Pneumonitis, interstitial lung disease.

Table 6 summarizes laboratory abnormalities worsening from baseline to Grade 3 or 4 in ≥1% of patients with dMMR EC on JEMPERLI in GARNET.

Table 6. Laboratory Abnormalities that Worsened from Baseline to Grade 3 or 4 Occurring in ≥1% of Patients with dMMR Endometrial Cancer Receiving JEMPERLI in GARNET

MSI-H/dMMR Locally Advanced Rectal Cancer

The safety of JEMPERLI was evaluated in 154 patients with previously untreated, MSI‑H/dMMR, Stage II/III, LARC enrolled in AZUR‑1 [see Clinical Studies (14.2)]. Patients received JEMPERLI 500 mg every 3 weeks for 9 cycles. The median duration of exposure to JEMPERLI was 27 weeks [range 6 to 42 weeks].

Serious adverse reactions occurred in 20% of patients receiving JEMPERLI. Serious adverse reactions in ≥1% of patients included colitis (1.9%), gastritis, rectal stenosis, and intestinal obstruction occurring at the tumor site (1.3% each).

JEMPERLI was permanently discontinued due to adverse reactions in 3% of patients. The following adverse reactions led to discontinuation in 1 patient each including lichen planus, hepatitis, increased amylase, and intestinal obstruction occurring at the tumor site.

Dosage interruptions due to an adverse reaction occurred in 19% of patients who received JEMPERLI. Adverse reactions that required dosage interruption in ≥1% of patients who received JEMPERLI included increased lipase (1.9%), increased amylase, diarrhea, increased transaminases, and intestinal obstruction occurring at the tumor site (1.3% each).

The most common adverse reactions (≥15%) were fatigue, rash, diarrhea, and pruritus. Table 7 summarizes the adverse reactions that occurred in ≥10% of patients with MSI‑H/dMMR LARC receiving JEMPERLI.

Table 7. Adverse Reactions (≥10%) in Patients with MSI-H/dMMR LARC Who Received JEMPERLI in AZUR-1

Clinically relevant adverse reactions in <10% of patients with MSI‑H/dMMR LARC who received JEMPERLI included: rectal stenosis (3.9%), tumor site intestinal obstruction (1.3%), and rectal obstruction (0.6%), including a fatal event of sepsis associated with intestinal obstruction and complications post-surgery. Immune-mediated reactions occurred in 23% of patients and included, among others, adrenal insufficiency, immune-mediated hypophysitis, and arthralgia.

Table 8 summarizes the laboratory abnormalities worsening from baseline to Grade 3 or 4 in ≥1% of patients with MSI‑H/dMMR LARC receiving JEMPERLI.

Table 8. Laboratory Abnormalities that Worsened from Baseline to Grade 3 or 4 Occurring in ≥1% of Patients with MSI-H/dMMR LARC Receiving JEMPERLI in AZUR-1

Mismatch Repair Deficient Recurrent or Advanced Solid Tumors

The safety of JEMPERLI was investigated in 267 patients with recurrent or advanced dMMR solid tumors enrolled in GARNET [see Clinical Studies (14.3)]. Patients received JEMPERLI 500 mg every 3 weeks for 4 cycles followed by 1,000 mg every 6 weeks as an intravenous infusion until disease progression or unacceptable toxicity. Patients with autoimmune disease that required systemic therapy within 2 years of treatment or a medical condition that required immunosuppression were ineligible. The median duration of exposure to JEMPERLI was 25 weeks (range: 1 to 139 weeks).

Serious adverse reactions occurred in 34% of patients receiving JEMPERLI. Serious adverse reactions in >2% of patients included abdominal pain (3.7%), sepsis (2.6%), and acute kidney injury (2.2%). Fatal adverse reaction occurred in 1 patient who received JEMPERLI due to respiratory failure.

JEMPERLI was permanently discontinued due to adverse reactions in 9% patients; the most common adverse reaction (³1%) leading to discontinuation was increased alanine aminotransferase (1.1%).

Dosage interruptions due to an adverse reaction occurred in 23% of patients who received JEMPERLI. Adverse reactions that required dosage interruption in ≥1% of patients who received JEMPERLI were anemia, pneumonitis, diarrhea, adrenal insufficiency, increased alanine aminotransferase, and increased aspartate aminotransferase.

The most common adverse reactions (≥20%) were fatigue/asthenia, anemia, diarrhea, and nausea.

Table 9 summarizes the adverse reactions that occurred in ≥10% of patients with dMMR recurrent or advanced solid tumors in GARNET.

Table 9. Adverse Reactions (≥10%) in Patients with dMMR Recurrent or Advanced Solid Tumors in GARNET

Clinically relevant adverse reactions in <10% of patients who received JEMPERLI included:

Endocrine Disorders: Hypothyroidism, hyperthyroidism, adrenal insufficiency, hypophysitis, autoimmune thyroiditis.

Eye Disorders: Uveitis.

Gastrointestinal Disorders: Colitis, enterocolitis, enterocolitis hemorrhage, pancreatitis, acute pancreatitis.

General Disorders and Administration Site Conditions: Chills.

Injury, Poisoning, and Procedural Complications: Infusion related reaction.

Hepatobiliary Disorders: Hepatocellular injury.

Musculoskeletal and Connective Tissue Disorders: Myalgia.

Renal and Urinary Disorders: Nephritis, tubulointerstitial nephritis.

Respiratory, Thoracic, and Mediastinal Disorders: Pneumonitis, interstitial lung disease.

Table 10 summarizes laboratory abnormalities worsening from baseline to Grade 3 or 4 in ≥1% of patients with dMMR recurrent or advanced solid tumors in GARNET.

Table 10. Laboratory Abnormalities that Worsened from Baseline to Grade 3 or 4 Occurring in ≥1% of Patients with dMMR Recurrent or Advanced Solid Tumors in GARNET

8 USE IN SPECIFIC POPULATIONS

8.1 Pregnancy

Risk Summary

Based on its mechanism of action, JEMPERLI can cause fetal harm when administered to a pregnant woman [see Clinical Pharmacology (12.1)]. There are no available data on the use of JEMPERLI in pregnant women. Animal studies have demonstrated that inhibition of the PD‑1/PD‑L1 pathway can lead to increased risk of immune‑mediated rejection of the developing fetus resulting in fetal death (see Data). Human IgG4 immunoglobulins (IgG4) are known to cross the placental barrier; therefore, dostarlimab‑gxly has the potential to be transmitted from the mother to the developing fetus. Advise women of the potential risk to a fetus.

In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.

Data

Animal Data: Animal reproduction studies have not been conducted with JEMPERLI to evaluate its effect on reproduction and fetal development. A central function of the PD-1/PD-L1 pathway is to preserve pregnancy by maintaining maternal immune tolerance to the fetus. In murine models of pregnancy, blockade of PD-L1 signaling has been shown to disrupt tolerance to the fetus and to result in an increase in fetal loss; therefore, potential risks of administering JEMPERLI during pregnancy include increased rates of abortion or stillbirth. As reported in the literature, there were no malformations related to the blockade of PD-1/PD-L1 signaling in the offspring of these animals; however, immune-mediated disorders occurred in PD-1 and PD-L1 knockout mice. Based on its mechanism of action, fetal exposure to dostarlimab-gxly may increase the risk of developing immune-mediated disorders or altering the normal immune response.

8.2 Lactation

Risk Summary

There is no information regarding the presence of dostarlimab‑gxly in human milk or its effects on the breastfed child or on milk production. Maternal IgG is known to be present in human milk. The effects of local gastrointestinal exposure and limited systemic exposure in the breastfed child to JEMPERLI are unknown. Because of the potential for serious adverse reactions in a breastfed child, advise women not to breastfeed during treatment and for 4 months after the last dose of JEMPERLI.

8.3 Females and Males of Reproductive Potential

JEMPERLI can cause fetal harm when administered to a pregnant woman [see Use in Specific Populations (8.1)].

Pregnancy Testing

Verify pregnancy status in females of reproductive potential prior to initiating JEMPERLI [see Use in Specific Populations (8.1)].

Contraception

Females: Advise females of reproductive potential to use effective contraception during treatment with JEMPERLI and for 4 months after the last dose.

8.4 Pediatric Use

The safety and efficacy of JEMPERLI have not been established in pediatric patients.

8.5 Geriatric Use

In Combination with Carboplatin and Paclitaxel

Of the 241 patients treated with JEMPERLI in RUBY, 52.3% were younger than 65 years, 36.5% were aged 65 through 74 years, and 11.2% were 75 years or older. No overall differences in safety or effectiveness were observed between these patients and younger patients.

As A Single Agent

Of the 605 patients treated with JEMPERLI in GARNET, 51.6% were younger than 65 years, 36.9% were aged 65 through 74 years, and 11.5% were 75 years or older. No overall differences in safety or effectiveness were observed between these patients and younger patients.

Of the 154 patients treated with JEMPERLI in AZUR-1, 58% were younger than 65 years, 26% were aged 65 through 74 years, and 16% were 75 years or older. No overall differences in safety or effectiveness were observed between these patients and younger patients.

11 DESCRIPTION

Dostarlimab-gxly is a programmed death receptor-1 (PD-1)–blocking IgG₄ humanized monoclonal antibody. Dostarlimab‑gxly is produced in Chinese hamster ovary cells and has a calculated molecular weight of about 144 kDa.

JEMPERLI (dostarlimab-gxly) injection is a sterile, clear to slightly opalescent, colorless to yellow solution essentially free from visible particles. It is supplied as single-dose vials.

Each vial contains 500 mg of JEMPERLI in 10 mL of solution with a pH of 6. Each mL of solution contains 50 mg of dostarlimab-gxly, citric acid monohydrate (0.48 mg), L-arginine hydrochloride (21.07 mg), polysorbate 80 (0.2 mg), sodium chloride (1.81 mg), trisodium citrate dihydrate (6.68 mg), and Water for Injection, USP.

12 CLINICAL PHARMACOLOGY

12.1 Mechanism of Action

Binding of the PD-1 ligands, PD-L1 and PD-L2, to the PD-1 receptor found on T cells inhibits T-cell proliferation and cytokine production. Upregulation of PD-1 ligands occurs in some tumors, and signaling through this pathway can contribute to inhibition of active T-cell immune surveillance of tumors. Dostarlimab-gxly is a humanized monoclonal antibody of the IgG4 isotype that binds to the PD-1 receptor and blocks its interaction with PD-L1 and PD-L2, releasing PD-1 pathway-mediated inhibition of the immune response, including the anti-tumor immune response. In syngeneic mouse tumor models, blocking PD-1 activity resulted in decreased tumor growth.

12.2 Pharmacodynamics

The exposure-response relationship and time course of pharmacodynamic response for safety and effectiveness of dostarlimab-gxly have not been fully characterized.

Dostarlimab-gxly provides sustained target engagement as measured by direct PD-1 binding and stimulation of IL-2 production throughout the dosing interval at the recommended dosage.

12.3 Pharmacokinetics

The pharmacokinetics of dostarlimab‑gxly as a single agent and in combination with carboplatin and paclitaxel were evaluated in patients with various solid tumors, including patients with EC. Mean C_max, AUC_0‑inf, and AUC_0‑tau increased proportionally over the dose range of 1 to 10 mg/kg. The Cycle 1 mean (coefficient of variation [%CV]) C_max and AUC_0‑tau of dostarlimab‑gxly as a single agent were 171 mcg/mL (20%) and 35,730 mcg•h/mL (20%), respectively at the dosage of 500 mg once every 3 weeks and 309 mcg/mL (31%) and 95,820 mcg•h/mL (29%), respectively at the dosage of 1,000 mg every 6 weeks.

Distribution

The mean (%CV) volume of distribution of dostarlimab‑gxly at steady state is approximately 5.8 L (15%).

Elimination

The mean terminal elimination half‑life of dostarlimab‑gxly at steady state is 23.5 days and its mean (%CV) clearance at steady state is 0.007 L/h (30%).

Metabolism: Dostarlimab‑gxly is expected to be metabolized into small peptides and amino acids by catabolic pathways.

Specific Populations

No clinically significant differences in the pharmacokinetics of dostarlimab‑gxly were observed based on age (24 to 86 years), sex, race/ethnicity (75% White, 2% Asian, and 5% African American), tumor type, and renal impairment based on the estimated creatinine clearance (eGFR ≥15 mL/min/1.73 m²), and mild to moderate hepatic impairment (total bilirubin [TB] >ULN to 3 times ULN or AST>ULN to any AST).

Drug Interaction Studies

Dostarlimab exposure when administered in combination with carboplatin and paclitaxel was comparable to single agent exposure and there was no evidence to suggest a clinically relevant change of dostarlimab‑gxly clearance over time in patients with recurrent or advanced EC.

12.6 Immunogenicity

The observed incidence of anti‑drug antibodies is highly dependent on the sensitivity and specificity of the assay. Differences in assay methods preclude meaningful comparisons of the incidence of anti‑drug antibodies in the studies described below with the incidence of anti‑drug antibodies in other studies, including those of JEMPERLI or of other dostarlimab‑gxly products.

Among patients who received JEMPERLI 500 mg every 3 weeks for 6 cycles followed by 1,000 mg every 6 weeks thereafter in RUBY, no one (n = 225) developed anti‑dostarlimab antibodies.

Among patients who received JEMPERLI 500 mg every 3 weeks for 4 cycles followed by 1,000 mg every 6 weeks thereafter in GARNET, 2.1% (8/384) of patients developed anti-dostarlimab antibodies with 50% (4/8) of these patients developing neutralizing antibodies.

Among patients who received JEMPERLI 500 mg every 3 weeks for 9 cycles in AZUR-1, 1% (2/153) of patients developed anti-dostarlimab antibodies; none of these patients developed neutralizing antibodies.

Because of the low occurrence of anti‑drug antibodies, the effect of these antibodies on the pharmacokinetics, effectiveness, and safety of dostarlimab products is unknown.

13 NONCLINICAL TOXICOLOGY

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

No studies have been performed to assess the potential of dostarlimab-gxly for carcinogenicity or genotoxicity.

Fertility studies have not been conducted with dostarlimab-gxly. In 1- and 3-month repeat‑dose toxicology studies in monkeys, there were no notable effects in the male and female reproductive organs; however, many animals in these studies were not sexually mature.

13.2 Animal Toxicology and/or Pharmacology

In animal models, inhibition of PD-L1/PD-1 signaling increased the severity of some infections and enhanced inflammatory responses. Mycobacterium tuberculosis-infected PD-1 knockout mice exhibit markedly decreased survival compared with wild-type controls, which correlated with increased bacterial proliferation and inflammatory responses in these animals. PD-1 blockade using a primate anti-PD-1 antibody was also shown to exacerbate M. tuberculosis infection in rhesus macaques. PD-L1 and PD-1 knockout mice and mice receiving PD-L1–blocking antibody have also shown decreased survival following infection with lymphocytic choriomeningitis virus.

14 CLINICAL STUDIES

14.1 Endometrial Cancer

In Combination with Carboplatin and Paclitaxel for the Treatment of Primary Advanced or Recurrent Endometrial Cancer

The efficacy of JEMPERLI in combination with carboplatin and paclitaxel, followed by JEMPERLI as a single agent, was evaluated in RUBY (NCT03981796), a randomized, multicenter, double-blind, placebo-controlled trial conducted in 494 patients with primary advanced or recurrent EC.

The trial enrolled patients with primary Stage III or Stage IV disease (per FIGO Staging Classification), including Stage IIIA to IIIC1 patients with evaluable or measurable disease, Stage IIIC1 patients with carcinosarcoma, clear cell, serous, or mixed histology regardless of presence of evaluable or measurable disease, Stage IIIC2 or Stage IV disease regardless of presence of evaluable or measurable disease. The trial also enrolled patients with first recurrent disease with a low potential for cure by radiation therapy or surgery alone or in combination, including patients who were naïve to systemic anticancer therapy or who had received prior neo-adjuvant/adjuvant systemic anticancer therapy and had a recurrence or disease progression ≥6 months after completing treatment.

Patients were randomized (1:1) to one of the following treatment arms:

• JEMPERLI 500 mg, carboplatin AUC 5 mg/mL/min, paclitaxel 175 mg/m² intravenously on Day 1 of each 21-day cycle for 6 cycles followed by JEMPERLI 1,000 mg intravenously every 6 weeks. JEMPERLI was administered prior to chemotherapy on Day 1.
• Placebo, carboplatin AUC 5 mg/mL/min, paclitaxel 175 mg/m² intravenously on Day 1 of each 21-day cycle for 6 cycles followed by placebo intravenously every 6 weeks.

Randomization was stratified by mismatch repair (MMR)/microsatellite instability (MSI) status, prior external pelvic radiotherapy, and disease status (recurrent, primary Stage III, or primary Stage IV). Treatment with JEMPERLI continued until disease progression, unacceptable toxicity, or a maximum of 3 years. Administration of JEMPERLI was permitted beyond disease progression (defined by Response Evaluation Criteria in Solid Tumors [RECIST] v1.1) if the patient was clinically stable and considered to be deriving clinical benefit by the investigator.

Assessment of tumor status was performed every 6 weeks through Week 25, every 9 weeks through Week 52 and every 12 weeks thereafter. The major efficacy outcomes were Progression-Free Survival (PFS) using RECIST v1.1 as assessed by investigator in the dMMR/MSI-H and overall populations, and Overall Survival (OS) in the overall population. Additional efficacy outcome measures included Objective Response Rate (ORR) per RECIST v1.1 as assessed by investigator and Duration of Response (DOR).

Among the 494 patients evaluated, the baseline characteristics were: median age 65 years (51% aged 65 years or older); 77% White, 12% Black, 3% Asian, 3% Hispanic or Latino; Eastern Cooperative Oncology Group (ECOG) Performance Status 0 (63%) or 1 (37%); and primary stage III (18%); primary stage IV (34%) and recurrent EC (48%). Overall, 24% were dMMR/MSI-H tumors and 76% were mismatch repair proficient (MMRp)/microsatellite stable (MSS) tumors.

Efficacy results are presented in Table 11 and Figures 1, 2 and 3. Treatment with JEMPERLI in combination with carboplatin and paclitaxel demonstrated statistically significant improvements in OS in the overall population and PFS in both the dMMR/MSI-H and overall population versus placebo in combination with carboplatin and paclitaxel. Pre-specified exploratory analyses of PFS and OS were performed in patients with MMRp/MSS EC.

Table 11. Efficacy Results of Endometrial Cancer Population in RUBY

In patients with MMRp/MSS EC (n = 372), the OS hazard ratio (HR) was 0.82 (95% CI: 0.62, 1.08) with a median OS of 32.5 (95% CI: 28.6, NR) months for JEMPERLI in combination with carboplatin and paclitaxel versus 28.2 (95% CI: 21.9, 36.1) months for placebo in combination with carboplatin and paclitaxel. The PFS HR was 0.78 (95% CI: 0.60, 1.00) with a median PFS of 9.8 (95% CI: 9.0, 12.6) months for JEMPERLI in combination with carboplatin and paclitaxel (n = 185) versus 7.9 (95% CI: 7.6, 9.8) months for placebo in combination with carboplatin and paclitaxel (n = 187).

Figure 1. Kaplan-Meier Curve for Overall Survival in Patients (Overall Population) with Endometrial Cancer in RUBY

Figure 2. Kaplan-Meier Curve for Progression-Free Survival in Patients (Overall Population) with Endometrial Cancer in RUBY

Figure 3. Kaplan-Meier Curve for Progression-Free Survival in Patients with dMMR/MSI-H Endometrial Cancer in RUBY

dMMR = Mismatch Repair Deficient; MSI-H = Microsatellite Instability High.

As A Single Agent for the Treatment of dMMR Recurrent or Advanced Endometrial Cancer

The efficacy of JEMPERLI as a single agent was evaluated in the GARNET trial (NCT02715284), a multicenter, multicohort, open‑label trial conducted in patients with advanced solid tumors. The efficacy population consisted of a cohort of 141 patients with dMMR recurrent or advanced EC who had progressed on or after treatment with a platinum‑containing regimen. Patients with prior treatment with PD‑1/PD‑L1–blocking antibodies or other immune checkpoint inhibitor therapy and patients with autoimmune disease that required systemic therapy with immunosuppressant agents within 2 years were excluded from the trial.

Patients received JEMPERLI 500 mg intravenously every 3 weeks for 4 doses followed by 1,000 mg intravenously every 6 weeks. Treatment continued until disease progression or unacceptable toxicity. The major efficacy outcome measures were ORR and DOR as assessed by blinded independent central review (BICR) according to the RECIST v1.1.

The baseline characteristics were: median age 65 years (53% aged 65 years or older); 77% White, 4% Asian, 3% Black, 4% Hispanic or Latino; and Eastern Cooperative Oncology Group Performance Status 0 (38%) or 1 (62%).

The most common histology seen was endometrioid carcinoma type 1 (65%), Grade 3 endometrioid (15%), followed by serous (5%), mixed (5%) and undifferentiated (2.8%).

All patients with dMMR EC had received prior anticancer treatment, with 89% of patients receiving prior anticancer surgery and 71% receiving prior anticancer radiotherapy. Sixty‑three percent of patients had one prior line of anticancer treatment and 37% had two or more prior lines. Forty‑eight patients (34%) received treatment only in the neoadjuvant or adjuvant setting before participating in the study.

The dMMR tumor status was retrospectively confirmed using the VENTANA MMR RxDx Panel assay.

Efficacy results are presented in Table 12.

Table 12. Efficacy Results of dMMR Endometrial Cancer Population in GARNET

14.2 MSI-H/dMMR Locally Advanced Rectal Cancer

AZUR-1

The efficacy of JEMPERLI as a single agent was evaluated in AZUR‑1 (NCT05723562), a multicenter, single-arm, open‑label trial. The population consisted of 154 patients with previously untreated, histologically confirmed, MSI-H/dMMR, Stage II (T3–T4, N0)/III (any T, N+) LARC. MSI‑H/dMMR tumor status was determined based on local testing assays (IHC, PCR, or NGS), or central testing (IHC) when no local result was available. Patients were required to have endoscopically and radiologically evaluable disease at baseline.

Patients received JEMPERLI 500 mg intravenously every 3 weeks for 9 cycles unless unacceptable toxicity or disease progression occurred.

To assess tumor response, a composite of clinical endoscopic, rectal magnetic resonance imaging (MRI), and computed tomography of the chest, abdomen, and pelvis was utilized during treatment and follow-up.

Response assessments included evaluations at Week 6 (endoscopy only), Week 12, and approximately 3 weeks after treatment completion. Patients transitioned to a non-operative management (NOM) period if clinical complete response (cCR) was determined at either the first or second response assessment after treatment with JEMPERLI. Patients who did not experience cCR, or whose disease recurred or progressed, were evaluated for standard of care management at investigator discretion. During the NOM period, patients were closely monitored for recurrence through regular multi-modal assessments conducted every 4 months for the first 2 years and every 6 months thereafter.

The primary efficacy outcome was sustained cCR for 12 months (cCR12) per independent central review (ICR). Sustained cCR began from the first disease assessment after the last dose of JEMPERLI where cCR was observed. Additional efficacy outcomes included cCR12 based on investigator tumor response assessments and objective response rate as per ICR and per investigator. Data were also collected on rectal cancer surgery, specifically, if patients underwent total mesorectal excision or were able to avoid surgery and preserve their rectum.

Among the 154 patients evaluated, the baseline characteristics were: median age 61.5 years (42% aged 65 years or older); male (62%), female (38%); 88% White, 7% Asian, 4% Black, 1% Unknown; 95% Not Hispanic or Latino, 5% Hispanic or Latino; Eastern Cooperative Oncology Group (ECOG) Performance Status 0 (71%) or 1 (29%); Stage II (14%) or Stage III (86%); and tumor stage T1/2 (9%), T3 (65%), and T4 (26%).

At the interim analysis (cut-off date 20 APR 2026) with median follow-up of 26 months, of the 154 patients, 110 (71%) patients did not receive further oncological treatment after JEMPERLI and had not progressed or relapsed, 26 (17%) underwent surgery (with or without additional systemic therapy or radiation), 13 (8%) received additional systemic therapy or radiation, 1 (0.6%) had progressive disease without further treatment, and 4 (2.5%) withdrew or were lost to follow-up. Among the 15 patients who underwent surgery after JEMPERLI alone, 12 had pathological complete response. Six patients died including 4 in the setting of progressive disease without initial response to JEMPERLI, 1 due to sepsis following treatment for intestinal obstruction, and 1died after withdrawal from the study.

Efficacy results are presented in Table 13.

Table 13. Efficacy Results of MSI-H/dMMR LARC Population in AZUR-1

MSKCC 19-288

Memorial Sloan Kettering Cancer Center (MSKCC) 19-288 study (NCT04165772) is a single-arm, open-label trial that assessed JEMPERLI as a single agent in 50 patients with previously untreated, MSI-H/dMMR, Stage II/III LARC. Patients received JEMPERLI 500 mg intravenously every 3 weeks for 9 cycles unless unacceptable toxicity or disease progression occurred. After treatment with JEMPERLI, patients in cCR would move into a NOM period and those not in cCR would receive chemoradiation and/or rectal cancer surgery if residual disease was observed.

The baseline characteristics were: median age 51 years (16% aged 65 years or older); female (56%), male (44%); 78% White, 12% Black, 10% Asian, 88% Not Hispanic or Latino, 12% Hispanic or Latino; ECOG Performance Status 0 (82%) or 1 (18%); Stage II (14%) or Stage III (86%); tumor stage T1/2 (20%), T3 (48%), and T4 (32%).

The cCR12 rate was 93% (95% CI: 82%, 99%) and the ORR was 100% (95% CI: 93%, 100%). No patients received chemoradiation and/or rectal cancer surgery as part of the treatment of LARC. Of the 27 patients who have been followed for at least 3 years, 1 patient had a local recurrence treated with lymphadenectomy, 1 patient withdrew, and 1 patient died unrelated to disease under study.

14.3 Mismatch Repair Deficient Recurrent or Advanced Solid Tumors

The efficacy of JEMPERLI as a single agent was evaluated in GARNET (NCT02715284), a non‑randomized, multicenter, open‑label, multicohort trial. The efficacy population consisted of a cohort of 209 patients with dMMR recurrent or advanced solid tumors who progressed following systemic therapy and had no satisfactory alternative treatment options. Patients with dMMR EC must have progressed on or after treatment with a platinum‑containing regimen. Patients with dMMR colorectal cancer must have progressed after or been intolerant to a fluoropyrimidine, oxaliplatin, and irinotecan.

Patients with prior treatment with PD‑1/PD‑L1–blocking antibodies or other immune checkpoint inhibitor therapy and patients with autoimmune disease that required systemic therapy with immunosuppressant agents within 2 years were excluded from the trial.

Patients received JEMPERLI 500 mg intravenously every 3 weeks for 4 doses followed by 1,000 mg intravenously every 6 weeks. Treatment continued until disease progression or unacceptable toxicity.

The major efficacy outcome measures were ORR and DOR as determined by a BICR according to RECIST v 1.1.

The baseline characteristics were female (77%); median age 63 years (47% aged 65 years or older); 63% White, 3% Asian, 2% Black; and Eastern Cooperative Oncology Group Performance Status 0 (39%) or 1 (61%).

At time of trial entry, 97.2% of patients (103/106) with non‑endometrial dMMR solid tumors had Stage IV disease, and 68.0% (70/103) of patients with dMMR endometrial tumors had FIGO Stage IV disease.

Approximately 43% of patients had received 1 prior line of systemic anticancer treatment, 36% had received 2 prior lines, and 21% had received 3 or more prior lines.

The dMMR tumor status was retrospectively confirmed using the VENTANA MMR RxDx Panel assay.

Efficacy results are presented in Tables 14 and 15.

Table 14. Efficacy Results of dMMR Recurrent or Advanced Solid Tumors in GARNET

Table 15. Efficacy Results of dMMR Tumor Types in GARNET

16 HOW SUPPLIED/STORAGE AND HANDLING

JEMPERLI (dostarlimab-gxly) injection is a clear to slightly opalescent, colorless to yellow solution supplied in a carton containing one 500 mg/10 mL (50 mg/mL), single-dose vial (NDC 0173-0898-03).

Store vial refrigerated at 2°C to 8°C (36°F to 46°F) in original carton to protect from light. Do not freeze or shake.

17 PATIENT COUNSELING INFORMATION

Advise the patient to read the FDA-approved patient labeling (Medication Guide).

Immune-Mediated Adverse Reactions

Inform patients of the risk of immune-mediated adverse reactions that may be severe or fatal, may occur after discontinuation of treatment, and may require corticosteroid or other treatment and interruption or discontinuation of JEMPERLI. These reactions may include:

• Pneumonitis: Advise patients to contact their healthcare provider immediately for new or worsening cough, chest pain, or shortness of breath [see Warnings and Precautions (5.1)].
• Colitis: Advise patients to contact their healthcare provider immediately for diarrhea or severe abdominal pain [see Warnings and Precautions (5.1)].
• Hepatitis: Advise patients to contact their healthcare provider immediately for jaundice, severe nausea or vomiting, or easy bruising or bleeding [see Warnings and Precautions (5.1)].
• Immune-mediated endocrinopathies: Advise patients to contact their healthcare provider immediately for signs or symptoms of hypothyroidism, hyperthyroidism, thyroiditis, adrenal insufficiency, hypophysitis, or type 1 diabetes mellitus [see Warnings and Precautions (5.1)].
• Nephritis: Advise patients to contact their healthcare provider immediately for signs or symptoms of nephritis [see Warnings and Precautions (5.1)].
• Severe skin reactions: Advise patients to contact their healthcare provider immediately for any signs or symptoms of severe skin reactions, SJS, TEN, or DRESS [see Warnings and Precautions (5.1)].

• Other immune-mediated adverse reactions:

  • Advise patients that immune-mediated adverse reactions can occur and may involve any organ system, and to contact their healthcare provider immediately for any new signs or symptoms [see Warnings and Precautions (5.1)].
  • Advise patients of the risk of solid organ transplant rejection and other transplant (including corneal graft) rejection. Advise patients to contact their healthcare provider immediately for signs or symptoms of organ transplant rejection [see Warnings and Precautions (5.1)].

Infusion-Related Reactions

• Advise patients to contact their healthcare provider immediately for signs or symptoms of infusion-related reactions [see Warnings and Precautions (5.2)].

Complications of Allogeneic HSCT

• Advise patients of the risk of post-allogeneic hematopoietic stem cell transplantation complications [see Warnings and Precautions (5.3)].

Embryo-Fetal Toxicity

• Advise females of reproductive potential of the potential risk to a fetus and to inform their healthcare provider of a known or suspected pregnancy [see Warnings and Precautions (5.4), Use in Specific Populations (8.1, 8.3)].
• Advise females of reproductive potential to use effective contraception during treatment with JEMPERLI and for 4 months after the last dose [see Warnings and Precautions (5.4), Use in Specific Populations (8.1, 8.3)].

Lactation

• Advise women not to breastfeed during treatment with JEMPERLI and for 4 months after the last dose [see Use in Specific Populations (8.2)].

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