[Essential and interpretation of Japanese Society for Cancer of the Colon and Rectum (JSCCR) guidelines 2019 for the treatment of colorectal cancer].

The Japanese Society for Cancer of the Colon and Rectum (JSCCR) published the guidelines 2019 for the treatment of colorectal cancer in March 2019. The new edition expanded the indications of endoscopic treatment, enriched the follow-up recommendations after endoscopic resection of early colorectal cancer, supplemented the indications of ISR and added the recommendations of lymph node recurrence and peritoneal recurrence. In the new edition, the adjuvant and palliative chemotherapy schemes were revised and patients with first-line chemotherapy were divided into three categories as follows: appropriate for intensive systemic therapy (fit), inappropriate for intensive systemic therapy (vulnerable), and inappropriate for systemic therapy (frail). The new edition of guidelines can also provide references to the doctors of colorectal cancer in our country. This article intends to interpret the essentials of this new edition.