[Complete cytoreductive surgery is the key to improving survival of colorectal cancer patients with peritoneal metastases: comment on PROPHYLOCHIP and PRODIGE 7].

Peritoneal carcinomatosis (PC) is one of the difficult problems in the treatment of colorectal cancer (CRC). Based on several retrospective analyses of large samples and prospective randomized controlled studies (RCTs), NCCN and PSOGI recommend cytoreductive surgery (CRS) plus hyperthermic intraperitoneal chemotherapy (HIPEC) for selected CRC patients with mild to moderate PC. There are two important controversial issues in this field: the survival benefit of second-look surgery plus HIPEC for the patients with high risk of PC, and the specific benefit of HIPEC added to CRS for patients with PC. PROPHYLOCHIP found that second-look surgery plus HIPEC in patients at high risk of PC does not result in increased survival. PRODIGE 7 showed that overall survival (OS, 41.7 months vs. 41.2 months, P=0.99) and recurrence-free survival (RFS, 13.1 months vs. 11.1 months, P=0.43) were similar between the HIPEC group and non-HIPEC group, and suggested that HIPEC is not necessary for patients who underwent complete CRS. However, due to a series of problems in the design and implementation of this trial, the conclusion has caused great controversy and has not been widely recognized. Through detailed analysis and in-depth discussion, we believe that the benefit of HIPEC could not be denied according to PRODIGE 7. CRS + HIPEC is the embodiment and model of the concept of "Solid tumor treatment is surgery-based integrated treatment". CRS is the cornerstone of therapeutic strategies with curative intent for CRC PC and complete CRS is the key to improve the prognosis. Furthermore, HIPEC is an effective supplement to CRS.腹膜转移是结直肠癌治疗领域的热点和难点，NCCN指南和PSOGI推荐肿瘤细胞减灭术（CRS）加腹腔热灌注化疗（HIPEC）治疗轻中度结直肠癌腹膜转移。在CRS+HIPEC治疗结直肠癌腹膜转移领域，腹膜转移高风险患者行二次探查+HIPEC是否有生存获益，以及HIPEC在该整合治疗体系中的价值，是两个争议已久的重要问题。针对上述问题，法国学者开展了两项随机对照研究：PROPHYLOCHIP研究和PRODIGE 7研究。（1）PROPHYLOCHIP研究发现，腹膜转移高风险患者初次手术后，密切观察组与二次探查+HIPEC组的DFS、OS比较差异无统计学意义，认为若初次手术理想、肿瘤细胞减灭完全，则无必要行二次探查+HIPEC；（2）PRODIGE 7研究发现，结直肠癌腹膜转移患者行完全CRS，联合或不联合HIPEC，其OS（41.7个月比41.2个月，P=0.99）和无复发生存（RFS）（13.1个月比11.1个月，P=0.43）比较差异均无统计学意义，认为对于此类患者行HIPEC是非必要的。然而，由于该研究设计和实施过程中的系列问题，其结论引起了巨大争议，未得到广泛认可。经过详细分析和深入探讨，我们认为，尚不能根据PRODIGE 7研究否认HIPEC的价值。CRS+HIPEC为核心的整合技术体系是"实体瘤治疗是以手术为主的整合治疗"理念的体现和典范，CRS是基石，完全CRS是改善患者预后的关键，HIPEC是CRS的有效补充。.