A Prospective Phase II Study of Individualized Neoadjuvant Chemoradiotherapy for Rectal Cancer Based on Recurrence Risk

Inclusion Criteria: 1. Rectal adenocarcinoma confirmed by histopathology 2. MRI staging was stage II / III (cT3-T4N0 or cT2-4N+) 3. The age is 18-75 years old, no gender limit 3\) The distance between the lower limit of the lesion and the anal margin was less than or equal to 10 cm 4) Karnofsky score ≥ 80 or ECOG score 0-1 Exclusion Criteria: 1. History of other malignant tumors; 2. They were allergic to 5-FU, platinum, etc; 3. The patient is in thrombolytic and anticoagulant therapy, and has bleeding quality or coagulation dysfunction; or in the past year, aneurysm, stroke, transient ischemic attack, arteriovenous malformation occurred; 4. After the previous renal history, proteinuria or clinical renal function were found to be abnormal; 5. History of gastrointestinal fistula, perforation or severe ulcer; 6. At present, there are active infection; clinical obvious heart disease; New York Heart Association (NYHA) ≥ grade II congestive heart failure; unstable symptomatic arrhythmia or peripheral vascular disease ≥ grade II; myocardial infarction and cerebrovascular accident occurred within 6 months before enrollment.