4.7 Article

Long-course oxaliplatin-based preoperative chemoradiation versus 5 x 5 Gy and consolidation chemotherapy for cT4 or fixed cT3 rectal cancer: results of a randomized phase III study

期刊

ANNALS OF ONCOLOGY
卷 27, 期 5, 页码 834-842

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OXFORD UNIV PRESS
DOI: 10.1093/annonc/mdw062

关键词

rectal cancer; preoperative chemoradiation

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资金

  1. Polish Ministry of Science and Higher Education [N N403 580538]

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This is a first phase III study to test preoperative short-course radiotherapy with consolidation chemotherapy (group A) against long-course chemoradiation (group B). Local effectiveness of the two methods was similar. Acute toxicity was lower in group A than in group B. Furthermore, results showed improved overall survival in group A compared with group B.Improvements in local control are required when using preoperative chemoradiation for cT4 or advanced cT3 rectal cancer. There is therefore a need to explore more effective schedules. Patients with fixed cT3 or cT4 cancer were randomized either to 5 x 5 Gy and three cycles of FOLFOX4 (group A) or to 50.4 Gy in 28 fractions combined with two 5-day cycles of bolus 5-Fu 325 mg/m(2)/day and leucovorin 20 mg/m(2)/day during the first and fifth week of irradiation along with five infusions of oxaliplatin 50 mg/m(2) once weekly (group B). The protocol was amended in 2012 to allow oxaliplatin to be then foregone in both groups. Of 541 entered patients, 515 were eligible for analysis; 261 in group A and 254 in group B. Preoperative treatment acute toxicity was lower in group A than group B, P = 0.006; any toxicity being, respectively, 75% versus 83%, grade III-IV 23% versus 21% and toxic deaths 1% versus 3%. R0 resection rates (primary end point) and pathological complete response rates in groups A and B were, respectively, 77% versus 71%, P = 0.07, and 16% versus 12%, P = 0.17. The median follow-up was 35 months. At 3 years, the rates of overall survival and disease-free survival in groups A and B were, respectively, 73% versus 65%, P = 0.046, and 53% versus 52%, P = 0.85, together with the cumulative incidence of local failure and distant metastases being, respectively, 22% versus 21%, P = 0.82, and 30% versus 27%, P = 0.26. Postoperative and late complications rates in group A and group B were, respectively, 29% versus 25%, P = 0.18, and 20% versus 22%, P = 0.54. No differences were observed in local efficacy between 5 x 5 Gy with consolidation chemotherapy and long-course chemoradiation. Nevertheless, an improved overall survival and lower acute toxicity favours the 5 x 5 Gy schedule with consolidation chemotherapy. The trial is registered as ClinicalTrials.gov number NCT00833131.

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