Locally Advanced Rectal Carcinoma: Curative Surgery Alone vs. postoperative Radiotherapy and Chemotherapy / 대한치료방사선과학회지

ABSTRACT

PURPOSE: To evauate the effects of postoperative radiotherapy an dchemotherapy on the pattern of failure and survival for locally advanced rectal carcinoma, we analyzed the two groups of patients who received curative resection only and who received postoperative radiochemotherapy retrospectively. MATERIALS AND METHODS: From June 1989 to December 1992, ninety nine patients with rectal cancer were treated by curative resection and staged as B2-3 or C. Group I(25) patients received curative resection only and group II(74) patients postoperative adjuvant therapy. Postoperative adjuvant group received radiation therapy (4500 cGy/ 25fx to whole pelvis)with 5-FU (500 mg/M2 , day 1-3 IV infusion) as radiosensitizer and maintenance chemotherapy with 5-FU(400mg/m2 for 5 days) and leuconvorin (20mg/m2 for 5 days) for 6 cycles. RESULTS: The patients in group I and group II were comparable in terms of age, sex, performance status, but in group II 74% of patients showed stage C compared with 56% of group I. All patients were flowed from 6 to 60 months with a median follow up of 29 months. Three year overall survival rates and disease free survival rates were 68%, 64% respectively in group I and 64%, 61%, respectively in group II. There was no statistical difference between the two treatment groups in overall survival rate and disease free survival rate. Local recurrences occurred in 28% of group I, 21% of group II (>0.05) and distant metastases occurred in 20% of group I, 27% of group II(p>0.05). The prognostic value of several variables other that treatment modality was assessed. In multivariate anaysis for prognostic factors stage and histologic grade showed statistically significant effect on local recurrences, and lymphatic or vessel invasion on distant metastasis. CONCLUSION: This retrospective study showed no statistical difference between two groups on the pattern of failure and survival. But considering that group II had more advanced stage and poor prognostic factors that group I, postoperative adjuvant radiochemotherapy improves the results for locally advanced rectal carcinoma as compared with curative surgery alone.