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  • Title: Evidence supporting the superiority of intraperitoneal cisplatin compared to intraperitoneal carboplatin for salvage therapy of small-volume residual ovarian cancer.
    Author: Markman M, Reichman B, Hakes T, Rubin S, Lewis JL, Jones W, Barakat R, Curtin J, Almadrones L, Hoskins W.
    Journal: Gynecol Oncol; 1993 Jul; 50(1):100-4. PubMed ID: 8349150.
    Abstract:
    PURPOSE: To examine the relative efficacy of cisplatin-based intraperitoneal (IP) therapy versus carboplatin-based IP therapy as salvage treatment of small-volume residual ovarian cancer. PATIENTS AND METHODS: We retrospectively examined the surgically defined response rates of patients with ovarian cancer treated at the Memorial Sloan-Kettering Cancer Center on four organoplatinum-based salvage IP trials (cisplatin/etoposide, cisplatin/cytarabine, carboplatin/etoposide, carboplatin/etoposide + recombinant human erythropoietin). Additional criteria for inclusion in this analysis were: (a) small-volume residual disease (microscopic disease only or largest residual tumor mass < or = 0.5 cm) when IP therapy was initiated; (b) prior response to organoplatinum-based systemic therapy; (c) laparotomy evaluation for response to the IP salvage program. RESULTS: The surgically documented complete response rate for patients with microscopic disease treated with cisplatin-based or carboplatin-based therapy was 46% (6/13) versus 38% (6/16), respectively (P > 0.25). In contrast, the surgically documented overall and complete response rates for patients with small-volume macroscopic disease treated with cisplatin or carboplatin were 71% (12/17) versus 32% (6/19) (P < 0.05, chi 2 test with Yates' correction), and 41% (6/17) versus 11% (2/19) (p < 0.1), respectively. CONCLUSION: In agreement with experimental data demonstrating that the concentration of platinum within tumor is higher following equimolar doses of cisplatin, compared to carboplatin, we have observed, in this retrospective analysis, a higher surgically documented response rate for patients with small-volume residual macroscopic ovarian cancer receiving salvage cisplatin-based IP therapy. While a randomized trial will be required to definitively address the question of the relative effectiveness of the two commercially available organoplatinum agents for IP treatment of ovarian cancer, our data suggest that cisplatin is the superior agent for regional therapy in this disease.
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