Sacituzumab Tirumotecan (MK-2870) in Post Platinum and Post Immunotherapy Endometrial Cancer (MK-2870-005)

Inclusion Criteria

• Has a histologically-confirmed diagnosis of endometrial carcinoma or carcinosarcoma.
• Has radiographically evaluable disease, either measurable or nonmeasurable per response evaluation criteria in solid tumors (RECIST 1.1), as assessed by blinded independent central review (BICR).
• Has received prior platinum-based chemotherapy and anti-programmed cell death 1 protein (PD-1)/anti- programmed cell death ligand 1 (PD-L1) therapy, either separately or in combination.

Exclusion Criteria

• Has neuroendocrine tumors or endometrial sarcoma, including stromal sarcoma, leiomyosarcoma, adenosarcoma, or other types of pure sarcomas
• Has a history of documented severe dry eye syndrome, severe Meibomian gland disease and/or blepharitis, or severe corneal disease that prevents/delays corneal healing
• Has active inflammatory bowel disease requiring immunosuppressive medication or previous history of inflammatory bowel disease
• Has had a recurrence of endometrial carcinoma or carcinosarcoma more than >12 months after completing platinum-based therapy administered in the curative-intent setting without any additional platinum-based therapy received in the recurrent setting. Note: 1) If Immunotherapy-based treatment is administered in the recurrent setting, then platinum rechallenge is not required, regardless of the duration of the platinum-free interval from time of adjuvant therapy 2) For Stage IVb disease, treatment that includes gynecological surgery followed by a platinum-based regimen is NOT considered curative-intent per protocol and does not require platinum rechallenge in the recurrent setting, regardless of the duration of the platinum-free interval
• Has received more than 3 prior lines of therapy for endometrial carcinoma or carcinosarcoma
• Has history of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease
• Has received prior treatment with single-agent nonplatinum based chemotherapy in the third-line setting
• Has received prior treatment with a trophoblast cell surface antigen 2 (TROP2)-targeted antibody drug conjugate (ADC) (eg, sacituzumab govitecan)
• Has received prior treatment with a topoisomerase I inhibitor-containing ADC (eg, sacituzumab govitecan or fam-trastuzumab deruxtecan-nxki)
• Has previously received both single-agent paclitaxel and single-agent doxorubicin in any setting for prior treatment of endometrial cancer
• Requires recurrent drainage of effusions (e.g., pleural, ascitic, etc.) within 6 weeks before randomization