Clinical trial NCT05440578: First-line Olaparib Combined With Bevacizumab Maintenance Therapy
Official title: Outcomes of First-line Olaparib Combined With Bevacizumab Maintenance Therapy in Newly Diagnosed Ovarian Cancer Patients With tBRCA Wild-type Tumors: a Real-world Study
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Ovarian Neoplasms
Keywords: tBRCA， olaparib，bevacizumab
Lead sponsor: Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University
Sponsor class: OTHER
First posted: 2022-07-01
Enrollment: 50
Sex: FEMALE
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: RETROSPECTIVE
Sampling method: PROBABILITY_SAMPLE
Study population: Patients diagnosed with HGSOC who started first-line olaparib plus bevacizumab maintenance therapy from Aug 2018 up to Dec 2020 (the time range could be extended in order to recruit enough eligible subjects as required) will be identified from the electronic medical record system.

Brief summary: Four phase III trials in ovarian cancer consistently showed that front-line poly(ADP-ribose) polymerase (PARP) inhibition can significantly improve progression-free survival. Based on these findings, current clinical guidelines recommend the olaparib plus bevacizumab combination as a maintenance therapy for ovarian cancer patients with BRCA1/2 wild-type or unknown mutation status who have a complete response (CR)/ partial response (PR) after completing bevacizumab-containing first-line therapy. However, bevacizumab is not a NATIONAL MEDICAL PRODUCTS ADMINSTRATION（ NMPA） -approved agent for ovarian cancer patients. In this setting, there is no olaparib plus bevacizumab maintenance therapy RWS data amongst 1st tBRCAwt patients in China, while this treatment regimen has been used in Chinese clinical practise by some doctors based on above-mentioned data.

Detailed description: The main objective is to evaluate the outcome of olaparib plus bevacizumab combination maintenance therapy by proportion of patients alive and progression free at 1 year (1-yr PFSrate) We hypothesize that olaparib plus bevacizumab maintenance therapy could be beneficial for tBRCAwt high-grade serous ovarian cancer (HGSOC) patients who are treated with platinum-based first-line chemotherapy.

The secondary objectives are to evaluate the outcomes of olaparib plus bevacizumab maintenance therapy by: 1) 2-yr PFS rate; 2) median PFS; 3) median Time to First Subsequent Therapy or death (mTFST) ; 4) post-progression treatment after first progression; 5) reason for olaparib plus bevacizumab dose adjustment, dose interruptions, and dose discontinuations; 6) Reason for use of concomitant therapy.

Eligibility criteria: Inclusion Criteria:

* Female Patients must be ≥18 years old at diagnosis.
* Patients with newly diagnosed, histologically confirmed, advanced (FIGO stage III-IV) ovarian cancer, primary peritoneal cancer and / or fallopian-tube cancer and received olaparib and plus bevacizumab from Aug 2018 up to Dec 2020 (the time range could be extended in order to recruit enough eligible subjects as required)
* Patients must have a tumor BRCA testing result which is tBRCAwt, defined as tumor BRCA wild type (patients without evidence of BRCA 1 and/or BRCA 2 deleterious or suspected deleterious mutations)
* Patients who have completed first-line platinum-based chemotherapy and were in clinical complete response (CR) or in partial response (PR)
* Patients who were still in CR or PR before receiving maintenance therapy
* Patients who received at least one dose of olaparib plus bevacizumab maintenance therapy within three months after platinum-based chemotherapy and without disease progression

Exclusion Criteria:

* Patient with multiple primary cancers as reported in EMR
* Concomitant any anti- cancer therapy (chemotherapy, immunotherapy, hormonal therapy (Hormone replacement therapy (HRT) is acceptable), radiotherapy, biological therapy or other novel agent) during olaparib plus bevacizumab maintenance therapy.
* Any previous treatment with PARP inhibitor.
* Patients with myelodysplastic syndrome/acute myeloid leukaemia or with features suggestive of MDS/AML.
* Patients with symptomatic uncontrolled brain metastases.
* Any other concerns related to decreased efficacy and safety of maintenance therapy.

Primary outcomes:
measure: 1-yr PFS rate
timeFrame: 12 months after date of first dose
Secondary outcomes:
measure: 2-yr PFS rate
timeFrame: 24 months after date of first dose
measure: Median PFS
timeFrame: Median time from date of randomization until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 100 months.
measure: mTFST
timeFrame: Median time from date of randomization until the date of first documented progression or date of death from any cause, whichever came first, assessed up to 100 months.
measure: Post-progression treatment
timeFrame: Through study completion, an average of 1 year
Other outcomes:
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