Free cancer cells can be detected in peritoneal fluid at the time of colorectal surgery.Peritoneal lavage in colorectal surgery for cancer is not used in routine,and the prognostic significance of intraperitoneal free cancer cells(IPCC)remains unclear.Data concerning the technique of peritoneal lavage to detect IPCC and its timing regarding colorectal resection are scarce.However,positive IPCC might be the first step of peritoneal spread in colorectal cancers,which could lead to early specific treatments.Because of the important heterogeneity of IPCC determination in reported studies,no treatment have been proposed to patients why positive IPCC.Herein,we provide an overview of IPCC detection and its impact on recurrence and survival,and we suggest further multi-institutional studies to evaluate new treatment strategies. Free cancer cells can be detected in peritoneal fluid at the time of colorectal surgery. Peritoneal lavage in colorectal surgery for cancer is not used in routine, and the prognostic significance of intraperitoneal free cancer cells (IPCC) remains unclear. Data concerning the technique of peritoneal lavage to detect IPCC and its timing regarding colorectal resection are scarce. Despite, the positive IPCC might be the first step of peritoneal spread in colorectal cancers, which could lead to early specific treatments.Because of the important heterogeneity of IPCC determination in reported studies, no treatment have been proposed to patients why positive IPCC.Herein, we provide an overview of IPCC detection and its impact on recurrence and survival, and suggest another multi-institutional studies to evaluate new treatment strategies.