Abstract:
Objective Pseudomyxoma peritonei (PMP) is a clinically malignant tumor syndrome derived from mucin-producing appendiceal tumors, and cytoreductive surgery (CRS) plus hyperthermic intraperitoneal chemotherapy (HIPEC) is a standard treatment for PMP recommended by the Peritoneal Surface Malignancy Group International (PSOGI). This retrospective study analyzed the efficacy and safety of CRS+HIPEC for PMP at our center.
Methods This was a retrospective study on the PMP database established at our center. The clinicopathological features, treatment details, and follow-up information on PMP patients were systematically established in this database. Survival analysis was conducted to evaluate the efficacy of treatment; univariate and multivariate analyses were performed to identify the independent prognostic factors. Perioperative adverse events were assessed to evaluate the safety of CRS + HIPEC.
Results Among the 182 PMP patients that received CRS+HIPEC, 73 (40.1%) had low-grade PMP, 50 (27.5%) had low-and-high mixed-grade PMP, 53 (29.1%) had high-grade PMP, and 6 (3.3%) had PMP with signet ring cells. The median peritoneal cancer index (PCI) was 30, and 74.0% of the patients had a PCI ≥20. There were 79 patients (44.1%) who had a completeness of cytoreduction (CC) score of 0-1. Of 182 patients, 48 (26.4%) died and 134 (73.6%) were alive, with the median overall survival (OS) from surgery being 64.7 months (95% CI: 43.1-84.3 months). Multivariate analysis and Cox proportional regression model analysis identified 4 independent prognostic factors: age (HR=12.079, 95% CI: 1.605-90.916), CC score (HR=0.211, 95% CI: 0.069-0.641), presence of anastomosis (0 vs. >1) (HR=5.519, 95% CI: 1.176-25.907), and number of anastomoses (1 vs. >1) (HR=7.543, 95% CI: 1.592-35.732). The perioperative mortality rate and serious adverse events rate was 1.6% and 19.8%, respectively.
Conclusions PMP patients treated with CRS+HIPEC to achieve complete cytoreduction at experienced centers may experience survival benefits with acceptable safety.