Olaparib Monotherapy and Olaparib + Pembrolizumab Combination Therapy for Ovarian Cancer

Study Overview
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Brief Summary
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To evaluate the efficacy and safety of preoperative olaparib monotherapy and preoperative olaparib plus pembrolizumab combination therapy in patients with untreated stage III, IV high-grade serous or Grade 3 endometrioid ovarian cancer with Homologous Recombination Deficiency (HRD) positivity.

Detailed Description
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To evaluate the efficacy and safety of preoperative olaparib monotherapy and preoperative olaparib plus pembrolizumab combination therapy in patients with untreated stage III, IV high-grade serous or Grade 3 endometrioid ovarian cancer with HRD positivity. The first cohort (Olaparib monotherapy : 10 cases) will be evaluated for the presence or absence of immune cell activation, and the tumor reduction effect will be evaluated in the second cohort (Olaparib plus pembrolizumab combination therapy : 20 cases).

Official Title
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A Pilot Study to Evaluate the Efficacy and Safety of Preoperative Olaparib Monotherapy and Preoperative Olaparib Plus Pembrolizumab Combination Therapy in Patients With HRD-Positive Stage III or IV Advanced Epithelial Ovarian/Fallopian Tube/Primary Peritoneal Cancer

Conditions
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Ovarian Cancer

Intervention / Treatment
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* Drug: Olaparib
* Drug: Pembrolizumab


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Has given signed informed consent to participate in the clinical trial of her own will. Is aged 20 years or older on the day of signing the informed consent. Has been diagnosed with histologically confirmed, Stage III or IV epithelial ovarian, fallopian tube, or primary peritoneal cancer by the International Federation of Gynecology and Obstetrics (FIGO) staging system (2014), with a histological type of high-grade serous or Grade 3 endometrioid carcinoma. Have measurable disease based on RECIST 1.1. Is a candidate for debulking surgery. Has an HRD-positive tumor. Has an ECOG Performance Status of 0 or 1. Laboratory test results within 21 days prior to enrollment have met the following organ function criteria. However, measurements within 14 days of blood transfusion or administration of granulocyte-colony stimulating factor (G-CSF) are excluded. Neutrophil count ≥ 1,500/mm3 Platelet count ≥ 100,000/mm3 Hemoglobin ≥ 9.0 g/dL Serum creatinine ≤ 1.5 × ULN, or creatinine clearance ≥ 50 mL/min T-Bil ≤ 2.0 mg/dL ALT and AST ≤ 100 U/L (≤ 200 U/L if liver metastasis is present) A woman of childbearing potential must agree to use contraception after signing the informed consent, throughout the study period, and until at least 120 days following the last dose of the study drug Exclusion Criteria: Has received previous allogeneic bone-marrow transplantation. Has concurrent interstitial lung disease/pneumonitis, or a history of (noninfectious) interstitial lung disease/pneumonitis that required treatment with steroids. Interstitial lung disease/pneumonitis includes radiation pneumonitis. Has received prior antitumor therapy (e.g., chemotherapy, molecular-targeted therapy, therapeutic antibody, endocrine therapy, immunotherapy, and investigational therapy). Has received surgery under general anesthesia within 28 days prior to enrollment. However, surgery to diagnose ovarian/fallopian tube/peritoneal cancer performed under general anesthesia is allowed. Has received radiation or radioactive isotope therapy within 28 days prior to enrollment. Has uncontrolled pericardial effusion, pleural effusion, or peritoneal effusion. Has a history of cerebral infarction, cerebral hemorrhage, or transient cerebral ischemia within 180 days prior to enrollment. Has a history of deep vein thrombosis or pulmonary embolism. Is receiving systemic glucocorticoid therapy or systemic immunosuppressive therapy. Has a history of autoimmune disease. Is infected with human immunodeficiency virus (HIV). Is infected with active* hepatitis B or hepatitis C. *: Active hepatitis B is defined as HBs antigen positive. Has a symptomatic infection within 14 days prior to enrollment. Has received a live vaccine within 28 days prior to enrollment. Has clinically critical cardiac disease (has a history of myocardial infarction or angina pectoris within 180 days prior to enrollment or has New York Heart Association [NYHA] class II or higher cardiac failure, uncontrolled arrhythmia, or QTc prolongation defined as QTc > 470 msec). Has active brain metastasis or a tumor causing spinal cord compression. Is pregnant or breastfeeding. Has a history of severe allergy, anaphylaxis, or hypersensitivity induced by humanized chimeric antibodies. Is allergic to biologics produced from Chinese hamster ovary (CHO) cells, carboplatin, or paclitaxel. Has a known or suspected active malignancy that is different from the disease of interest in the clinical trial or has a history of other malignancy within 3 years prior to enrollment. However, cutaneous basal cell carcinoma and cervical carcinoma in situ are not part of this exclusion criterion. Is unwilling to or unable to comply with the protocol. Is not eligible to enroll in the clinical trial based on the judgment by the Investigator or Sub-investigator.

Ages Eligible for Study
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Minimum Age: 20 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Interventional Model Description: This study has 2 cohorts. Cohort 1 is Olaparib monotherapy Cohort 2 is Olaparib plus Pembrolizumab combination therapy
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Olaparib or Olaparib Plus Pembrolizumab<br>Cohort 1 : Olaparib will be administered for 6 weeks before surgery. Cohort 2 : Olaparib and Pembrolizumab will be administered simultaneously for 2 cycles(6 weeks) before surgery. | Drug: Olaparib<br>* Olaparib will be administered at a dose of 300mg as oral dose, twice a day.<br>Drug: Pembrolizumab<br>* Pembrolizumab will be administered at a dose of 200mg as a 30-minutes IV infusion, Q3W (25 minutes to 40 minutes are acceptable).<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Objective response rate (ORR) | Objective response rate (ORR) according to Response Evaluation Criteria in Solid Tumours (RECIST) version. 1.1. | 6 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The incidence of adverse events | The incidences and types of adverse events that occur during treatment will be evaluated according to the National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) version 5.0. | Up to 30 days after the last dose | 
| Chemotherapy response score (CRS) | To evaluate the effect of histopathological treatment on patients with serous carcinoma and metastasis to the omentum. The histopathological treatment effect is determined according to the chemotherapy response score (CRS) | 6 months from the end of registration | 
| Progression-free survival (PFS) | PFS is defined as the time from the first dose to the earlier of progression assessed by the Investigator per RECIST v. 1.1 (PD) or clinical criteria, or death due to any cause. | 6 months from the end of registration | 
| Overall survival (OS) | OS is defined as the time from the first dose to death due to any cause. | 6 months from the end of registration |