Background: Unlike novel molecular-targeted therapies for metastatic gastrointestinal stromal tumors (GIST), conventional treatments for peritoneal sarcomatosis (PS) are mostly ineffective. As with carcinomatosis of epithelial origin, a rationale base supports an aggressive locoregional treatment of PS, but the use of CRS and HIPEC in this setting is still controversial. We assessed the outcome of clinically and pathologically homogeneous subsets of patients with PS uniformly treated by cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC).
Methods: A prospective database of 37 patients who underwent CRS and close-abdomen HIPEC with cisplatin and doxorubicin or mitomycin-C was reviewed. PS originated from GIST (pre-imatinib era) in 8 patients, uterine leiomyosarcoma (ULS) in 11, retroperitoneal liposarcoma (RPLP) in 13, and other sarcoma in 5.
Results: CRS was macroscopically complete in 28 patients (75.7%). Operative mortality was 3.7% and morbidity 21.6%. After median follow-up of 104 (range, 1-131) months, peritoneal disease progression occurred in 16 patients, distant metastases in 5, and both in 13. For all patients, median overall survival was 26.2 months; 7 patients were alive at 46-130 months (ULS, n = 4; RPLP, n = 2; GIST, n = 1). RPLP had the best overall survival (median, 34 months) but 100% peritoneal relapse; GIST had dismal overall, local-regional-free and distant-free survival; ULS had the higher proportion of long survivors and best local-regional-free survival.
Conclusions: Overall, results of CRS and HIPEC did not compare favorably to those of conventional therapy. In a subgroup analysis, the combined approach did not change GIST and RPLS natural history. The interesting results with ULS may warrant further investigations.