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Background: Ovarian carcinoma represents 30% of all cancers of the female genital tract, of which high-grade serous carcinomas (HGSCs) are predominant, accounting for 70%. Aims and Objectives: To study the clinicopathological findings and to analyze the postchemotherapy changes in tumors treated with neoadjuvant chemotherapy (NACT). Materials and Methods: All cases diagnosed as ovarian serous carcinoma between 2015 and 2017 at our institute were retrospectively reviewed. Clinical and gross findings were collected, microscopic findings were reviewed, and tumor grade was reassessed as per the World Health Organization 2014 criteria. Chemotherapy response score (CRS) was assessed in cases which received prior chemotherapy. Results: Among malignant ovarian tumors, serous carcinoma was the most common, accounting to 38 cases (44.7%). Of these, six were low-grade serous carcinoma and 32 were HGSC. Among HGSC, six (18.75%) cases showed serous tubal intraepithelial carcinoma. Among 18 (47.4%) cases with prior NACT, CRS-1 was seen in six cases, CRS-2 in seven cases, and CRS-3 in five cases. Cancer antigen (CA)-125 levels were markedly raised in all cases. In six cases postchemotherapy, CA-125 levels were below normal with a CRS-2–3. Omental deposits were seen in 15 (39.47%) cases and showed lesser response to prior NACT compared to tumor in the ovary. Conclusion: HGSC is the most common ovarian serous carcinoma. There is correlation between the biochemical and morphological response to chemotherapy in our study. Pathologists should be well aware of postchemotherapy morphological changes in ovarian serous carcinoma.

Ovarian serous carcinoma: A retrospective study of clinicopathological findings and postchemotherapy changes