Evaluation and response assessment
tumor, erosion, cancer, Tumors, ulcer
TUMOR, EROSION, CANCER, TUMORS, PRIMARY TUMOR, ULCER
The primary tumor was confirmed using colonoscopy, and CR for the primary tumor was achieved if the following criteria were met: (i) tumor disappearance, (ii) disappearance of ulcer and erosion, and (iii) no cancer cells found on biopsy. Treatment responses were assessed 12 weeks after the completion of radiotherapy based on the Response Evaluation Criteria in Solid Tumors (RECIST) using CT and/or MRI [