A Clinical Trial of Sac-TMT in People With Non-HRD Positive Advanced Ovarian Cancer (MK-2870-021)

Participants will receive sac-TMT on days 1, 15, and 29 (q2W) of every 6-week cycle, until disease progression, prohibitive toxicity, or other protocol-defined reason for discontinuation. Participants receive optional bevacizumab at investigator's discretion on Days 1 and 22 (q3w) of every 6-week cycle, for up to 22 courses.

Drug: Sacituzumab tirumotecan · Drug: Bevacizumab · Drug: Rescue Medications

Participants will either receive bevacizumab q3w of every 6-week cycle for up to 22 courses until disease progression, prohibitive toxicity, or other protocol-defined reason for discontinuation of study intervention, or will be observed only and actively followed if not receiving bevacizumab.

Drug: Bevacizumab

Administered via intravenous (IV) infusion at a dose of 4mg/kg

Administered via IV infusion at a dose of 15mg/kg

Participants must receive prophylactic steroid mouthwash (dexamethasone or equivalent). It is recommended that participants receive the following rescue medications prior to sac-TMT infusion, per approved product label: histamine-1 receptor antagonist, histamine-2 receptor antagonist, acetaminophen or equivalent, and dexamethasone or equivalent.

Plazo: Up to approximately 49 months

PFS is defined as the time from randomization to the first documented progressive disease (PD) per Response Evaluation Criteria In Solid Tumors (RECIST) 1.1 by blinded independent central review (BICR) or death due to any cause, whichever occurs first. Per RECIST 1.1, PD is defined as ≥20% increase in the sum of diameters of target lesions. In addition to the relative increase of 20%, the sum must also have demonstrated an absolute increase of ≥5 mm. The appearance of one or more new lesions is also considered PD.

Plazo: Up to approximately 78 months

OS is defined as the time from randomization to death due to any cause.

Plazo: Up to approximately 78 months

PFS2 as assessed by investigator is defined as the time from randomization to the documented subsequent objective disease progression after initiation of new anticancer therapy or death due to any cause, whichever occurs first.

Plazo: Up to approximately 78 months

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study intervention.

Plazo: Up to approximately 78 months

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study intervention.

Plazo: Baseline and up to approximately 78 months

EORTC QLQ-C30 is a questionnaire to assess the overall quality of life (QoL) of cancer patients. Participant responses to the questions "How would you rate your overall health during the past week?" and "How would you rate your overall quality of life during the past week?" are scored on a 7- point scale (1= Very poor to 7=Excellent). Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. A higher score indicates a better overall health status. The change from baseline in EORTC QLQ-C30 Items 29 and 30 combined score will be presented.

Plazo: Baseline and up to approximately 78 months

EORTC QLQ-C30 is a questionnaire to assess the overall QoL of cancer patients. Participant responses to 5 questions about their physical functioning are scored on a 4-point scale (1 = Not at All to 4 = Very Much). The combined score is computed by averaging the raw scores of the 5 questions and then applying a linear transformation to standardize the average score, so that the combined score ranges from 0 to 100. A higher score indicates a better outcome. The change from baseline in the EORTC QLQ-C30 physical functioning combined score will be presented.

Plazo: Baseline and up to approximately 78 months

EORTC QLQ-C30 is a questionnaire to assess the overall QoL of cancer patients. Participant responses to 2 questions about their role functioning are scored on a 4-point scale (1 = Not at All to 4 = Very Much). The combined score is computed by averaging the raw scores of the 2 items and then applying a linear transformation to standardize the average score, so that the combined score ranges from 0 to 100. A higher score indicates a better outcome. The change from baseline in the EORTC QLQ-C30 role functioning combined score will be presented.

Plazo: Baseline and up to approximately 78 months

EORTC QLQ-OV28 is an OC-specific module to supplement the EORTC QLQ-C30. Participant responses to the 6 abdominal/GI symptoms scale questions are scored on a 4-point scale (1=not at all, 4=very much). The combined score is computed by averaging the raw scores of the 6 items and then applying a linear transformation to standardize the average score, so that the combined score ranges from 0 to 100. The change from baseline in abdominal and gastrointestinal symptoms (EORTC QLQ-OC28 Items 31-36) score will be presented. A lower score indicates a better outcome.

A Phase 3, Randomized, Open-label, Multicenter Study of Sacituzumab Tirumotecan (Sac-TMT, MK-2870) Maintenance Treatment With or Without Bevacizumab Versus Standard of Care in Participants With Newly Diagnosed Advanced Non-HRD Positive Ovarian Cancer Following First-line Platinum-based Chemotherapy (TroFuse-021/ENGOTov85/GOG-3102)