Dostarlimab

What it is and how it works

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.

Mechanism class: Programmed Death Receptor-1-directed Antibody Interactions

Indications

is a programmed death receptor-1 (PD-1)–blocking antibody indicated: Endometrial Cancer • in combination with carboplatin and paclitaxel, followed by JEMPERLI as a single agent, for the treatment of adult patients with primary advanced or recurrent endometrial cancer (EC). • as a single agent for the treatment of adult patients with mismatch repair deficient (dMMR) recurrent or advanced EC, as determined by an FDA-approved 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. ( 1.1 , 2.1 ) Mismatch Repair Deficient Recurrent or Advanced Solid Tumors • as a single agent for the treatment of adult patients with dMMR recurrent or advanced solid tumors, as determined by an FDA-approved test, that have progressed on or following prior treatment and who have no satisfactory alternative treatment options. 1 ( 1.2 , 2.1 ) 1 This indication is approved under accelerated approval based on tumor response rate and durability of response.

Dosage and administration (summary)

• JEMPERLI, in combination with carboplatin and paclitaxel, for primary advanced or recurrent EC: 500 mg every 3 weeks for 6 cycles followed by 1,000 mg monotherapy every 6 weeks for all cycles thereafter. • JEMPERLI, as a single agent, for dMMR recurrent or advanced EC: 500 mg every 3 weeks for 4 cycles followed by 1,000 mg every 6 weeks for all cycles thereafter. • JEMPERLI, as a single agent, for dMMR recurrent or advanced solid tumors: 500 mg every 3 weeks for 4 cycles followed by 1,000 mg every 6 weeks for all cycles thereafter. • Administer as an intravenous infusion over 30 minutes. • For complete dosing instructions, see full prescribing information.

Contraindications

None. None.

Warnings and precautions

• Immune-mediated adverse reactions, which may be severe or fatal, can occur in any organ system or tissue, including the following: immune‑mediated pneumonitis, immune-mediated colitis, immune‑mediated hepatitis, immune-mediated endocrinopathies, immune-mediated nephritis with renal dysfunction, immune‑mediated dermatologic adverse reactions, and solid organ transplant rejection. Monitor for signs and symptoms of immune‑mediated adverse reactions. Evaluate clinical chemistries, including liver enzymes, creatinine, and thyroid function, at baseline and periodically during treatment.

Pregnancy

Pregnancy Risk Summary Based on its mechanism of action, JEMPERLI can cause fetal harm when administered to a pregnant woman . There are no available data on the use of JEMPERLI in pregnant women.

Storage and supply

(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.

Source: Dostarlimab (Jemperli) — US FDA prescribing information, 2025-09-02, DailyMed. Summarised and shortened; the full label governs. Iranian registration, indications and labelling may differ.