Abstract:
Objective Pseudomyxoma peritonei (PMP) is a rare clinical syndrome. Cytoreductive surgery (CRS) combined with hyperthermic intraperitoneal chemotherapy (HIPEC) is gradually being accepted as the standard treatment for PMP. At Aerospace Hospital, we have been treating patients with PMP since 2008 and performing total peritoneal resection since 2016. This study summarizes the experience at our center and collates past data.
Methods We performed a retrospective analysis of a prospectively maintained database of all patients who had undergone CRS and HIPEC for PMP at our center. Clinical data, such as the surgical approach, completeness of cytoreduction, and surgical complications, were collected. The results from follow-up were analyzed to simultaneously evaluate the clinical value of CRS+HIPEC and peritonectomy procedures.
Results A total of 854 consecutive patients with PMP were included in the study. Their mean age was 50 years. The median modified peritoneal cancer index (PCI) was 29. Of the patients, 25.5% underwent radical surgery with complete cytoreduction (CC) 0/1. The overall complication rate was 21.7%, and the perioperative mortality rate was 1.1%. Since the adoption of peritonectomy from 2016, the proportion of patients who underwent CC-0/1 at our center increased from 14.3% to 36.5%, and the incidence of complications decreased significantly (16.8% vs. 28.8%, P < 0.001). The 5- and 10- year survival rates of patients who had undergone CC-0/1 were 77% and 64.3%, respectively, which were significantly better than those of patients who had undergone CC-2/3 (45.8% and 39.4%, respectively). There was also a significant difference in the survival rate between patients who had undergone CC-2 and those who had undergone CC-3 (10-year OS 45.5% vs. 34.5%, P=0.006). The modified PCI, surgical approach, intraoperative HIPEC, pathological grade, and CA125 levels were independent risk factors for postoperative overall survival.
Conclusions CRS+HIPEC is a safe and effective treatment for PMP. The technique of peritoneal resection can significantly improve the degree of radical care, while reducing the risks of complications. For patients in whom radical resection cannot be achieved, maximal tumor reduction may also prolong long-term survival.