Radiotherapy alone and chemoradiation for nonmetastatic esophageal carcinoma. A critical review of chemoradiation.

Abstract

Sixty-five patients with nonmetastatic (Stages I, II, and III) esophageal cancer (EC) were treated with radiotherapy (RT) alone (56.00 to 61.00 Gy in 6 to 7 weeks) or synchronous combinations of radiotherapy and chemotherapy (RT-CT). RT-CT consisted of 41.40 to 50.40 Gy in 4.5 to 8 weeks with continuous infusion 5-fluorouracil 5-FU (1000 mg/m2/d for 4 days in weeks 1, 4, and 8), mitomycin C (10 mg/m2 intravenously [IV] in weeks 1 and 8), cisplatin (75 mg/m2 IV in week 4). Maintenance CT consisted of methotrexate (200 mg/m2 IV), leucovorin (10 mg/m2 orally every 6 hours for 5 doses), and 5-FU (600 mg/m2 IV) in weeks 10, 12, and 14. Thirty-five patients treated by RT alone (Group A) were comparable in terms of age, sex, AJC staging, histologic condition, and location of primary with 30 patients treated by RT-CT (Group B). In Group A (range, 2- to 144+ months), two patients (42 and 144 months) are alive and well. In Group B (range, 2- to 59+ months), 12 patients (7 to 59 months) are alive and well. Median survival in Group A is 8 months, compared with 15 months for patients achieving a complete response (CR) in Group B. Patients in Group B achieved a 77% CR rate by endoscopy-biopsy, whereas 30% of the patients in Group A achieved a CR (P = 0.0001). The recurrence rates at the primary site/regional nodes were 77% and 27% in Groups A and B, respectively (P = 0.0001). The incidences of distant metastases were 29% and 20%, respectively (P = 0.423). In Group A, the 1-year and 2-year cumulative survival rates were 27% and 13%, respectively. In Group B, the cumulative survival rates were 53% at 1 year and 29% at 2 years (P = 0.023). Aside from reversible myelotoxicity, the incidences of pulmonary fibrosis, esophagitis, and fistulae formation were less frequent in the combined technique treatment group. A compilation of reported chemoradiation protocols for EC indicates consistently improved 1-year and 2-year survival rates, compared with surgical and RT series. The key to further improvement in the treatment of EC appears to lie in increasing the biologic response (RT fractionation and endocavitary RT) and optimal use of multiple effective CT agents with nonadditive toxicities.