1. Postoperative Chemoradiotherapy With Capecitabine and Oxaliplatin vs Capecitabine for Stage II to III Rectal Cancer
- Author
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Li, Ning, Zhu, Yuan, Liu, Lu-Ying, Feng, Yan-Ru, Wang, Wen-Ling, Wang, Jun, Wang, Hao, Li, Gao-Feng, Tang, Yuan, Hu, Chen, Liu, Wen-Yang, Ren, Hua, Wang, Shu-Lian, Wang, Wei-Hu, Song, Yong-Wen, Liu, Yue-Ping, Fang, Hui, Tang, Yu, Lu, Ning-Ning, Chen, Bo, Qi, Shu-Nan, Liu, Xin-Fan, Li, Ye-Xiong, and Jin, Jing
- Subjects
Male ,Postoperative Care ,Antimetabolites, Antineoplastic ,China ,genetic structures ,Rectal Neoplasms ,Research ,Antineoplastic Agents ,Chemoradiotherapy ,Middle Aged ,Neoadjuvant Therapy ,Oxaliplatin ,Online Only ,Treatment Outcome ,Oncology ,health services administration ,Humans ,Female ,Fluorouracil ,therapeutics ,Capecitabine ,Original Investigation - Abstract
Key Points Question Can adding oxaliplatin to postoperative capecitabine-based chemoradiotherapy (CRT) and contemporary adjuvant chemotherapy regimens in locally advanced rectal cancer improve the efficacy of treatment? Findings In this randomized clinical trial of 602 adults, the addition of oxaliplatin to capecitabine-based postoperative CRT did not significantly improve disease-free survival. Meaning These findings suggest that capecitabine-based postoperative CRT could be considered to be an alternative type of multidisciplinary management of locally advanced rectal cancer for patients who did not receive neoadjuvant CRT., This randomized clinical trial examines the efficacy and toxic effects of postoperative capecitabine vs oxaliplatin plus capecitabine with radiotherapy for stage II and III rectal cancer., Importance Several studies have explored the efficacy and toxic effects of concurrent 5-fluorouracil (5-FU)– or capecitabine-based chemoradiotherapy (CRT) with or without oxaliplatin in the neoadjuvant setting. Addition of oxaliplatin to 5-FU or capecitabine elicited similar outcomes but with significantly increased toxic effects; however, there is a need for randomized clinical trials comparing 2 CRT regimens for patients receiving CRT in the adjuvant setting. Objective To explore the efficacy and toxic effects of oxaliplatin combined with postoperative concurrent capecitabine and radiotherapy (RT) for pathological stage II and III rectal cancer. Design, Setting, and Participants This multicenter randomized clinical trial enrolled patients from 7 centers in China between April 1, 2008, and December 30, 2015. Patients with pathologically confirmed stage II and III rectal cancer were randomized (1:1) to receive concurrent CRT with capecitabine or capecitabine plus oxaliplatin. Analysis was conducted from December 31, 2019, to March 15, 2020. Interventions RT comprised 45 to 50 Gy in 25 fractions of 1.8 to 2.0 Gy over 5 weeks. In the capecitabine with RT group, concurrent chemotherapy included 2 cycles of capecitabine (1600 mg/m2) on days 1 to 14 and 22 to 35. The capecitabine and oxaliplatin with RT group received identical postoperative RT to that in the capecitabine with RT group combined with capecitabine (1300 mg/m2) on days 1 to 14 and 22 to 35 and a 2-hour infusion of oxaliplatin (60 mg/m2) on weeks 1, 2, 4, and 5. Patients in both groups received adjuvant chemotherapy (capecitabine or fluorouracil and oxaliplatin) after CRT. Main Outcomes and Measures The primary end point was 3-year disease-free survival (DFS). Results A total of 589 patients (median [IQR] age, 55 [47-52] years; 375 [63.7%] men and 214 [36.3%] women) were enrolled, including 294 patients randomized to the capecitabine with RT group and 295 patients randomized to the capecitabine and oxaliplatin with RT group. Median (IQR) follow-up was 68 (45-96) months. Most patients had stage III disease (574 patients [75.9%]). Three-year DFS was 76.3% for the capecitabine with RT group and 74.1% for the capecitabine and oxaliplatin with RT group, and 5-year DFS was 72.0% for the capecitabine with RT group and 71.1% for the capecitabine and oxaliplatin with RT group (hazard ratio [HR], 1.07; 95% CI, 0.79-1.44; P = .68). There was no significant difference between groups in overall survival (HR, 0.93; 95% CI, 0.64-1.34; P = .70) or local recurrence (HR, 0.61; 95% CI, 0.31-1.22; P = .16). More grade 3 and 4 acute toxic effects were observed in the capecitabine and oxaliplatin with RT group than in the capecitabine with RT group (114 patients [38.6%] vs 84 patients [28.6%]; P = .01). Conclusions and Relevance This randomized clinical trial found that addition of oxaliplatin to capecitabine-based postoperative CRT did not improve the efficacy of treatment but increased the risk of severe acute toxic effects. This finding highlights the basic role of postoperative capecitabine with RT for patients with locally advanced rectal cancer. Trial Registration ClinicalTrials.gov Identifier: NCT00714077
- Published
- 2021