A 48-year-old woman with stage IB clear-cell ovarian cancer (unilateral tumor, intact capsule, negative peritoneal washings) has undergone total abdominal hysterectomy, bilateral salpingo-oophorectomy, and staging laparotomy. She has normal renal function. What is the drug of choice for adjuvant chemotherapy?

## Adjuvant Chemotherapy for Early-Stage Ovarian Cancer ### Clear-Cell Ovarian Cancer: Special Considerations **Key Point:** Clear-cell ovarian cancer is a rare, chemotherapy-resistant histotype with poor prognosis. Even in early stage, adjuvant platinum-based chemotherapy is recommended due to high recurrence risk. ### Stage IB Clear-Cell Ovarian Cancer Management **High-Yield:** Although stage IB is technically early-stage, clear-cell histology warrants adjuvant chemotherapy because: - Clear-cell tumors have inherently aggressive biology and higher recurrence rates - Platinum resistance is common (30–40% of cases) - GOG-157 trial demonstrated improved recurrence-free survival with adjuvant chemotherapy in early-stage ovarian cancer - Standard regimen: **Paclitaxel + Carboplatin** for 3–6 cycles ### Rationale for Paclitaxel + Carboplatin in This Setting **Clinical Pearl:** Despite clear-cell tumors being relatively platinum-resistant, paclitaxel + carboplatin remains the standard of care because: 1. It is the only evidence-based regimen with demonstrated benefit in early-stage disease 2. The taxane component (paclitaxel) provides additional activity against clear-cell histology 3. No superior alternative has been validated in prospective trials ### Comparison: Early-Stage Ovarian Cancer Adjuvant Therapy | Stage & Histology | Chemotherapy | Rationale | |-------------------|--------------|----------| | IA/IB serous/mucinous | Consider observation OR chemotherapy | Low recurrence risk; individualize | | IA/IB clear-cell/endometrioid | Paclitaxel + Carboplatin | High recurrence risk; recommend chemotherapy | | IC (any histology) | Paclitaxel + Carboplatin | Peritoneal spillage; chemotherapy indicated | | II (any histology) | Paclitaxel + Carboplatin | Advanced early-stage; chemotherapy indicated | **Mnemonic:** **CLEAR** = **C**hemotherapy **L**ikely **E**ven in **A**dvanced-**R**isk early-stage disease. [cite:Williams Gynecology 3e Ch 34]