1. A Phase I Study of IV Doxorubicin Plus Intraperitoneal (IP) Paclitaxel and IV or IP Cisplatin in Endometrial Cancer Patients at High Risk for Peritoneal Failure (GOG 9920): An NRG Oncology/Gynecologic Oncology Group Study
- Author
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McMeekin, D. Scott, Sill, Michael W., Walker, Joan L., Moore, Kathleen N., Waggoner, Steven E., Thaker, Premal H., Rizack, Tina, Hoffman, James S., and Fracasso, Paula M.
- Abstract
One of the most important risk factors associated with recurrence and survival among patients with endometrial cancer is stage. The extent and distribution of tumor tissue in advanced stage disease define use of postoperative adjuvant therapies. Stages III and IV disease have different clinical behaviors, prognoses, and response to adjuvant chemotherapy. There is high risk of disease recurrence and a poor prognosis for stages III and IV disease in patients with intraperitoneal (IP) involvement; reported 5-year survival rates range from 5% to 20%.A Gynecologic Oncology Group (GOG) trial published in 2004 demonstrated that in patients with stage III-IV endometrial cancer, use of the 3-drug paclitaxel, doxorubicin, and cisplatin (TAP) regimen produced improved response rates, progression-free survival (PFS), and overall survival (OS) compared with doxorubicin and cisplatin: response rate, 57% versus 34%; PFS, median, 8.3 versus 5.3 months; and OS, median, 15.3 versus 12.3 months. These results led to the TAP regimen being considered a new standard of care. However, the complete response rate with TAP was still low (<25% in patients with measurable disease), and about 50% of stage III patients and 90% of stage IV patients had a recurrence and died of their disease. Intraperitoneal disease spread appears to be responsible for this poor outcome.The investigators hypothesized that the addition of IP drug delivery to the TAP regimen would be effective therapy for advanced-stage endometrial cancer and could reduce the toxicity observed with the intravenous (IV) TAP regimen. Dosing and toxicities of the IP regimen, cisplatin and paclitaxel, have been well studied in other tumors; however, this regimen has not been well studied in endometrial cancer.The present phase 1 study was conducted to determine the maximum tolerated dose of a modified TAP regimen, which incorporated IP paclitaxel or IP paclitaxel/cisplatin (IV/IP-based TAP regimen) in advanced-stage endometrial cancer. Participants had histologically confirmed endometrial cancer and FIGO (1998) stage IIIA/IIIC with positive cytologic washings/ascites, adnexal spread, or serosal involvement or stage IV (IP disease spread). A 3 + 3 dose escalation study was conducted for the dose escalation phase of the study; 5 dose levels were evaluated. A total of 6 cycles were administered to all patients on a 21-day schedule. Patients received cycles 1 to 2 with standard IV TAP and cycles 3 to 6 with IV/IP-based TAP regimen. Adverse events reported on cycles 3 and 4 were evaluated for dose-limiting toxicity (DLT) and decisions on dose escalation.Between 2008 and 2014, 21 eligible patients were enrolled; 17 of these patients were evaluable for DLT. Among these 17, 13 patients (76%) had stage IV disease, and 10 (59%) had serous or clear cell histology. The maximum tolerated dose for the IV/IP-based TAP regimen was determined to be at dose level 3 (cycles 3-6 including IP paclitaxel 90 mg/m2, IV doxorubicin 45 mg/m2, and IV cisplatin 50 mg/m2). Three DLT events occurred that were related to grades 3 to 4 metabolic (electrolyte) toxicities. Although 1 patient developed a grade 2 sensory neuropathy event, none developed grades 3 to 4 sensory neuropathy, and myelosuppression was tolerable without the need for granulocyte colony-stimulating factor. Fifteen of the evaluable patients (88%) received all 6 cycles of IV/IP. At a median follow-up time of 22 months, 46% of patients remained progression-free at 2 years. The 2-year survival rate was 55%, with a median OS of 30 months.These findings suggest that treatment of advanced-stage endometrial cancer with an IV/IP based-modification of a standard TAP regimen may enhance efficacy and reduce toxicity. Further study of IP therapy in endometrial cancer is warranted based on the high rate of completing 6 cycles of therapy, low rates of neuropathy, and tolerable myelosuppression, as well as promising PFS and OS.
- Published
- 2015
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