Neoplasms

Urinary Tract, Sexual Organs, and Pregnancy Conditions

All Conditions

Symptoms and General Pathology

Endometrial Neoplasms

Death

Uterine Neoplasms

Genital Neoplasms, Female

Urogenital Neoplasms

Uterine Diseases

Genital Diseases, Female

Genital Diseases

Urogenital Diseases

Female Urogenital Diseases

Pregnancy Complications

Female Urogenital Diseases and Pregnancy Complications

Antineoplastic Agents

All Drugs and Chemicals

Anti-Infective Agents

Paclitaxel

Lenvatinib

Doxorubicin

Liposomal doxorubicin

Pembrolizumab

Albumin-Bound Paclitaxel

Endothelial Growth Factors

Mitogens

Tubulin Modulators

Antimitotic Agents

Antineoplastic Agents, Immunological

Immune Checkpoint Inhibitors

Anti-Bacterial Agents

Antibiotics, Antitubercular

Enzyme Inhibitors

Protein Kinase Inhibitors

Participants will receive pembrolizumab 200 milligram (mg) administered by intravenous (IV) infusion on Day 1 of each 21-day cycle plus lenvatinib 20 mg administered orally (PO) once daily (QD) during each 21-day cycle for up to 35 cycles.

Participants will receive either of the following treatments: doxorubicin 60 milligram per square meter (mg/m\^2) administered by IV on Day 1 of each 21-day cycle for up to a maximum cumulative dose of 500 mg/m\^2 OR paclitaxel 80 mg/m\^2 administered by IV on a 28-day cycle: 3 weeks receiving paclitaxel once a week and 1 week not receiving paclitaxel.

200 mg administered by IV infusion on Day 1 of each 21-day cycle.

20 mg administered orally (PO) QD during each 21-day cycle.

80 mg/m\^2 administered by IV on a 28-day cycle: 3 weeks receiving paclitaxel once a week and 1 week not receiving paclitaxel.

60 mg/m\^2 administered by IV on Day 1 of each 21-day cycle.

Medical Director

This is a study of pembrolizumab (MK-3475, KEYTRUDA®) in combination with lenvatinib (E7080) versus treatment of physician's choice (doxorubicin or paclitaxel) for the treatment of advanced endometrial cancer. Participants will be randomly assigned to receive either pembrolizumab and lenvatinib or treatment of physician's choice. The primary study hypothesis is that pembrolizumab in combination with lenvatinib prolongs progression free survival (PFS) and overall survival (OS) when compared to treatment of physician's choice.

Lenvatinib in Combination With Pembrolizumab Versus Treatment of Physician's Choice in Participants With Advanced Endometrial Cancer (MK-3475-775/E7080-G000-309 Per Merck Standard Convention [KEYNOTE-775])

A Multicenter, Open-label, Randomized, Phase 3 Trial to Compare the Efficacy and Safety of Lenvatinib in Combination With Pembrolizumab Versus Treatment of Physician's Choice in Participants With Advanced Endometrial Cancer

PFS was defined as the time from the date of randomization to the date of the first documentation of disease progression, as determined by Blinded Independent Central Review (BICR) per Response Evaluation Criteria In Solid Tumors (RECIST) version 1.1 or death due to any cause (whichever occurred first). Disease progression was defined as at least 20 percent (%) increase (including an absolute increase of at least 5 millimeter \[mm\]) in the sum of diameter of target lesions, taking as reference the smallest sum and/or unequivocal progression of existing non-target lesions and/or appearance of 1 or more new lesions. PFS was estimated and analyzed using Kaplan-Meier method.

OS was defined as the time from the date of randomization to the date of death due to any cause. Participants who were lost to follow-up and those who were alive at the date of data cut-off were censored at the date the participant was last known alive, or date of data cut-off, whichever occurred first.

ORR was defined as the percentage of participants who had best overall response of either complete response (CR) or partial response (PR) as determined by BICR per RECIST 1.1. CR was defined as the disappearance of all target and non-target lesions (non-lymph nodes). All pathological lymph nodes (whether target or non-target) must have a reduction in their short axis to less than (\<) 10mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum of diameters.

EORTC QLQ-C30 was a questionnaire which included 30 questions that rates the overall quality of life in cancer participants. The first 28 questions use a 4-point scale (1=not at all to 4=very much) for evaluating function (physical, role, social, cognitive, emotional), symptoms (diarrhea, fatigue, dyspnea, appetite loss, insomnia, nausea/vomiting, constipation, and pain) and financial difficulties. The last 2 questions use a 7-point scale (1=very poor to 7=excellent) to evaluate overall health and quality of life. Scores are transformed to a range of 0 to 100 using a standard EORTC algorithm. A high score for a functional scale represents a high/healthy level of functioning, a high score for the global health status/quality of life (QoL) represents a high QoL, but a high score for a symptom scale/item represents a high level of symptomatology/problem. Data for this outcome measure will be reported after study completion (anticipated study completion date is November 2023).

TEAEs was defined as AEs that occurred (or worsened, if present at Baseline) after the first dose of study drug through 28 days after the last dose of study drug. AE was defined as any untoward medical occurrence in a participants or clinical study participant temporally associated with the use of study treatment, whether or not considered related to the study treatment. A SAE was defined as any untoward medical occurrence at any dose if it resulted in death or life-threatening AE or required inpatient hospitalization or prolongation of existing hospitalization or resulted in persistent or significant incapacity or substantial disruption of the ability to conduct normal life functions or was a congenital anomaly/birth defect. irAE was defined as any unfavorable and unintended immune-related sign, symptom, or disease (new or worsening) temporally associated with the use of study therapy, regardless of whether or not a causal relationship with the study therapy can be determined.

TEAEs was defined as those AEs that occurred (or worsened, if present at Baseline) after the first dose of study drug through 30 days after the last dose of study drug. An AE was defined as any untoward medical occurrence in a participants or clinical study participant temporally associated with the use of study treatment, whether or not considered related to the study treatment.

Time to treatment failure due to toxicity was defined as the time from the date of randomization to the date a participant discontinued study treatment due to TEAEs. Data for this outcome measure will be reported after study completion (anticipated study completion date is November 2023).

Sparse pharmacokinetic (PK) samples were collected and analyzed using a population PK approach to estimate PK parameters. Individual predicted CL/F for lenvatinib was then derived from the PK model. The data was collected and analyzed for lenvatinib plus pembrolizumab arm only.

Sparse PK samples were collected and analyzed using a population PK approach to estimate PK parameters. Individual predicted AUC for lenvatinib was then derived from the PK model. The data was collected and analyzed for lenvatinib plus pembrolizumab arm only.

Merck Sharp & Dohme LLC

Eisai Inc.

Participants with EC received lenvatinib 20 mg orally, once daily, plus pembrolizumab 200 mg intravenously, every 3 weeks in each 21-day cycle. Participants continued to receive treatment until disease progression, development of unacceptable toxicity, withdrawal of consent, completion of 35 treatments (approximately 2 years) with pembrolizumab, or sponsor termination of the study.

Lenvatinib 20 mg + Pembrolizumab 200 mg

Participants with EC received either doxorubicin 60 mg/m\^2 intravenously, every 3 weeks, in each 21-day treatment cycle, or paclitaxel 80 mg/m\^2 intravenously, weekly (3 weeks on/1 week off), in each 28-day treatment cycle. Participants continued to receive treatment until a lifetime cumulative dose of 500 mg/m\^2 doxorubicin, a maximum dose of paclitaxel per standard of care, or until disease progression, development of unacceptable toxicity, withdrawal of consent, or sponsor termination of the study.

Treatment of Physician's Choice: (TPC) Doxorubicin or Paclitaxel

Treatment of Physician's Choice (TPC): Doxorubicin or Paclitaxel

Total

Age, Continuous

Sex: Female, Male

Ethnicity (NIH/OMB)

Race (NIH/OMB)

The Intention-to-treat (ITT) population included all randomized participants.

Eisai Medical Information

The ITT population included all randomized participants.

Progression-free Survival (PFS)

Overall Survival (OS)

Objective Response Rate (ORR)

Health-Related Quality of Life (HRQoL) Assessed by European Organisation for the Research and Treatment of Cancer (EORTC) Quality of Life Questionnaire C30 (QLQC30) Score

Participants With TEAEs

Participants With SAEs

Participants With irAEs

Safety analysis population included all randomized participants who received at least 1 dose of study treatment.

Number of Participants With Treatment-emergent Adverse Events (TEAEs), Serious Adverse Events (SAEs) and Immune-Related Adverse Events (irAEs)

Percentage of Participants Discontinued Study Treatment Due to TEAEs

Time to Treatment Failure Due to Toxicity

The population pharmacokinetic analysis set includes all the participants who have received at least 1 dose of study treatment with documented dosing history in the lenvatinib plus pembrolizumab arm, and have measurable plasma levels of lenvatinib. Here "overall number of participants analyzed" signifies participants who were evaluable for this outcome measure.

Model Predicted Apparent Total Clearance (CL/F) for Lenvatinib

Model Predicted Area Under the Plasma Drug Concentration-time Curve (AUC) for Lenvatinib

Participants with Endometrial cancer (EC) received lenvatinib 20 milligrams (mg) orally, once daily, plus pembrolizumab 200 mg intravenously, every 3 weeks in each 21-day cycle. Participants continued to receive treatment until disease progression, development of unacceptable toxicity, withdrawal of consent, completion of 35 treatments (approximately 2 years) with pembrolizumab, or sponsor termination of the study.

Participants with EC received either doxorubicin 60 milligrams per square meter (mg/m\^2) intravenously, every 3 weeks, in each 21-day treatment cycle, or paclitaxel 80 mg/m\^2 intravenously, weekly (3 weeks on/1 week off), in each 28-day treatment cycle. Participants continued to receive treatment until a lifetime cumulative dose of 500 mg/m\^2 doxorubicin, a maximum dose of paclitaxel per standard of care, or until disease progression, development of unacceptable toxicity, withdrawal of consent, or sponsor termination of the study.

Study title	NCT ID	Conditions	Interventions	Eligibility	Organization	Link
Lenvatinib in Combination With Pembrolizumab Versus Treatment of Physician's Choice in Participants With Advanced Endometrial Cancer (MK-3475-775/E7080-G000-309 Per Merck Standard Convention [KEYNOTE-775])	NCT03517449	Endometrial Neo...	Pembrolizumab Lenvatinib Paclitaxel Doxorubicin	18 Years -	Eisai Inc.
Lenvatinib in Combination With Pembrolizumab Versus Treatment of Physician's Choice in Participants With Advanced Endometrial Cancer (MK-3475-775/E7080-G000-309 Per Merck Standard Convention [KEYNOTE-775])	NCT03517449	Endometrial Neo...	Pembrolizumab Lenvatinib Paclitaxel Doxorubicin	18 Years -	Eisai Inc.

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