Clinical Analysis of HIPEC for T4 Colorectal Cancer After Surgery

Background: Colorectal cancer (CRC) is the third most common malignancy worldwide, nearly 1.4 million new cases every year, for about 694000 deaths. Surgery is the primary treatment and results in a cure rate of approximately 50% of the patients. However, recurrence following surgery is a major problem, the second most common site of recurrence was peritoneum, which was as a result of the intraperitioneal free cancer cells (FCC) and microscopic cancer (MC). The remaining free cancers and microscopic cancer in abdominal cavity can not be killed completely because of the "peritoneal-plasma barrier" and "non-sufficient drug concentration in abdominal cavity by systemic venous chemotherapy". In recent years, hyperthermic intraperitioneal chemotherapy(HIPEC) has already been shown to be effective in improving the 5 year survival rate of colorectal cancer. However, lots of clinically studies for patients with colorectal cancer are advanced, it is not sure yet whether surgery combined with HIPEC is effective on decreasing the rate of peritoneal carcinomatosis in T4 stage colorectal cancer. The efficacy tend to be magnified when stage T4 patients account for less, confusing HIPEC for treatment of patients with advanced colorectal cancer. Therefore, the aim of this study is to investigate the clinical efficacy of HIPEC in T4 stage patients, ruling out the effects of different T stages on curative effect. The results of this study will hopefully provide the clinical basis for improving the prognosis of patients with advanced colorectal cancer. Study design： This is a multicenter study in which 300 patients with T4 colorectal cancer will be randomized to surveillance alone (control group) or HIPEC (experimental group) after resection of the primary tumor, either by laparoscopy or open approach. Subsequently, all patients started mfolfox6 chemotherapy after operation in a month. Adverse reaction of chemotherapy during chemotherapy and post chemotherapy period will be recorded. Study population: The patients with colorectal cancer (T4N0-2M0) will undergo a curative resection by laparoscopy or open approach. Intervention: HIPEC equipment used in the perfusion fluid (Lobaplatin of 50mg completely dissolved in 3000ml saline solution) is headed to 43℃. Then, it is injected into the peritoneal cavity by flow velocity of 200-400ml/min for 60 minutes. Outcomes: Primary endpoint is incidence of endoperitoneal recurrence at 36 months. Secondary endpoints are disease-free survival, overall survival, incidence of peritoneal carcinomatosis at end of follow-up with or without concomitant liver/lung metastases, quality of life and morbidity rate.