Epithelial Ovarian Cancer Management
A 58-year-old woman reports 6 months of pelvic heaviness and increasing abdominal distension. Examination shows a distended, diffusely tender abdomen with a large abdominopelvic mass. CT and ultrasound show a 12 cm solid left ovarian mass, moderate ascites, and diffuse peritoneal thickening. CA-125 is 640 U/mL. Which of the following is the mainstay of treatment for the most likely diagnosis?
- A.Surgery alone
- B.Radiation therapy alone
- C.Cytoreductive surgery followed by chemotherapyCorrect
- D.Cytoreductive surgery followed by radiation therapy
Explanation
A large solid adnexal mass with ascites, peritoneal thickening and a markedly elevated CA-125 in a postmenopausal woman is epithelial ovarian carcinoma with peritoneal spread until proven otherwise. Ovarian cancer disseminates by transcoelomic exfoliation of cells onto peritoneal surfaces, which is why omental caking, peritoneal thickening and malignant ascites appear early and why the disease is usually advanced stage at diagnosis. Standard care is exploratory laparotomy for complete surgical staging plus maximal cytoreduction (debulking), because residual disease volume is the strongest modifiable predictor of survival. Surgery alone leaves microscopic and often macroscopic disease throughout the peritoneum, so adjuvant platinum-based chemotherapy, typically carboplatin plus paclitaxel for six cycles, is mandatory. In selected patients with very bulky disease, neoadjuvant chemotherapy precedes interval debulking, but the surgery plus chemotherapy backbone is unchanged. Radiation has essentially no role in primary management because the disease is distributed across the whole peritoneal cavity, which cannot be irradiated at tumoricidal dose. Percutaneous biopsy of an operable adnexal mass is avoided for fear of rupture and upstaging. CA-125 is then used to monitor response and detect recurrence.
Why each option
- A.
- Surgery alone leaves microscopic peritoneal disease and yields inferior survival; adjuvant chemotherapy is required in essentially all stages beyond low-risk stage IA.
- B.
- Radiation alone is not used for primary ovarian cancer; the disease involves the whole peritoneal cavity, which cannot be safely irradiated.
- C.
- Correct. Complete surgical staging with maximal debulking followed by platinum and taxane chemotherapy is the standard of care.
- D.
- The correct adjuvant modality after debulking is chemotherapy, not radiation.
Reference: NCCN Guidelines, Ovarian Cancer, 2024; Williams Gynecology, 4th ed., 2020
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