Outcomes of non-high grade serous carcinoma after neoadjuvant chemotherapy for advanced-stage ovarian cancer: a Korean gynecologic oncology group study (OV 1708).
BACKGROUND
Outcomes of patients with ovarian high-grade serous carcinoma (HGSC) treated with neoadjuvant chemotherapy (NAC) have been widely studied, but there is limited information on the outcomes of patients with non-HGSC. This study aimed to evaluate the outcomes of NAC in non-HGSC patients with advanced-stage ovarian cancer.


METHODS
We conducted a retrospective cohort study of patients who underwent NAC for advanced stage non-HGSC between 2002 and 2017 in 17 institutions. Demographics, surgical outcomes, and survival rates were evaluated according to histological subtypes.


RESULTS
A total of 154 patients were included in this study, comprising 20 cases (13.0%) of mucinous adenocarcinoma, 31 cases (20.1%) of endometrioid adenocarcinoma, 28 (18.2%) cases of clear cell carcinoma, 29 (18.8%) cases of low-grade serous carcinoma and 12 cases (7.8%) of carcinosarcoma. Complete remission/partial remission after the third cycle of NAC was achieved in 100 (64.9%) patients and optimal debulking surgery (residual disease ≤1 cm) at interval debulking surgery was achieved in 103 (66.9%) patients. The most common reason for performing NAC was high tumor burden (n = 106, 68.8%). The median progression-free survival (PFS) was 14.3 months and median overall survival (OS) was 52.9 months. In multivariate analyses, mucinous and clear cell carcinoma were negative prognostic factors for both PFS (p = 0.007 and p = 0.017, respectively) and OS (p = 0.002 and p = 0.013, respectively).


CONCLUSIONS
In this study, poor survival outcomes were observed in patients with mucinous and clear cell carcinoma undergoing NAC. Different treatment strategies are urgently required to improve survival outcomes for this disease subset.
['Chung|Young Shin|YS|', 'Park|Sang-Yoon|SY|', 'Lee|Jung-Yun|JY|', 'Park|Jeong-Yeol|JY|', 'Lee|Jeong-Won|JW|', 'Kim|Hee Seung|HS|', 'Suh|Dong Soo|DS|', 'Kim|Yun Hwan|YH|', 'Lee|Jong-Min|JM|', 'Kim|Miseon|M|', 'Choi|Min Chul|MC|', 'Shim|Seung-Hyuk|SH|', 'Lee|Keun Ho|KH|', 'Song|Taejong|T|', 'Hong|Jin Hwa|JH|', 'Lee|Won Moo|WM|', 'Lee|Banghyun|B|', 'Lee|In Ho|IH|']
D000328:Adult D000368:Aged D000971:Antineoplastic Combined Chemotherapy Protocols D018284:Cystadenocarcinoma, Serous D018450:Disease Progression D005260:Female D006801:Humans D053208:Kaplan-Meier Estimate D008875:Middle Aged D020360:Neoadjuvant Therapy D060787:Neoplasm Grading D009367:Neoplasm Staging D010051:Ovarian Neoplasms D056910:Republic of Korea D012189:Retrospective Studies D016896:Treatment Outcome
Non-high grade serous carcinoma Survival Histologic subtype Neoadjuvant therapy Ovarian neoplasms