All authors: Memorial Sloan-Kettering Cancer Center, New York, NY.
J Clin Oncol. 2014 Feb 20;32(6):513-8. doi: 10.1200/JCO.2013.51.7904. Epub 2014 Jan 13.
PURPOSE: Although neoadjuvant chemoradiotherapy achieves low local recurrence rates in clinical stages II to III rectal cancer, it delays administration of optimal chemotherapy. We evaluated preoperative infusional fluorouracil, leucovorin, and oxaliplatin (FOLFOX)/bevacizumab with selective rather than consistent use of chemoradiotherapy. PATIENTS AND METHODS: Thirty-two patients with clinical stages II to III rectal cancer participated in this single-center phase II trial. All were candidates for low anterior resection with total mesorectal excision (TME). Patients were to receive six cycles of FOLFOX, with bevacizumab included for cycles 1 to 4. Patients with stable/progressive disease were to have radiation before TME, whereas responders were to have immediate TME. Postoperative radiation was planned if R0 resection was not achieved. Postoperative FOLFOX × 6 was recommended, but adjuvant regimens were left to clinician discretion. The primary outcome was R0 resection rate. RESULTS: Between April 2007 and December 2008, 32 (100%) of 32 study participants had R0 resections. Two did not complete preoperative chemotherapy secondary to cardiovascular toxicity. Both had preoperative chemoradiotherapy and then R0 resections. Of 30 patients completing preoperative chemotherapy, all had tumor regression and TME without preoperative chemoradiotherapy. The pathologic complete response rate to chemotherapy alone was 8 of 32 (25%; 95% CI, 11% to 43%). The 4-year local recurrence rate was 0% (95% CI, 0% to 11%); the 4-year disease-free survival was 84% (95% CI, 67% to 94%). CONCLUSION: For selected patients with clinical stages II to III rectal cancer, neoadjuvant chemotherapy and selective radiation does not seem to compromise outcomes. Preoperative Radiation or Selective Preoperative Radiation and Evaluation Before Chemotherapy and TME (PROSPECT), a randomized phase III trial to validate this experience, is now open in the US cooperative group network.
目的:尽管新辅助放化疗可使临床 II 期至 III 期直肠癌的局部复发率降低,但它会延迟最佳化疗的应用。我们评估了术前输注氟尿嘧啶、亚叶酸钙和奥沙利铂(FOLFOX)/贝伐单抗,选择性而非常规使用放化疗。
患者和方法:32 例临床 II 期至 III 期直肠癌患者参与了这项单中心 II 期试验。所有患者均适合行低位前切除术和全直肠系膜切除术(TME)。患者接受 6 个周期的 FOLFOX,贝伐单抗用于前 4 个周期。疾病稳定/进展的患者将在 TME 前进行放疗,而缓解的患者将立即进行 TME。如果未达到 R0 切除,则计划进行术后放疗。建议术后行 6 个周期的 FOLFOX,但辅助方案由临床医生决定。主要结局是 R0 切除率。
结果:2007 年 4 月至 2008 年 12 月,32 例(100%)研究参与者均行 R0 切除术。有 2 例因心血管毒性而未能完成术前化疗。这 2 例均行术前放化疗,然后行 R0 切除术。在完成术前化疗的 30 例患者中,所有患者均接受了肿瘤退缩和无术前放化疗的 TME。单独化疗的病理完全缓解率为 32 例中的 8 例(25%;95%CI,11%至 43%)。4 年局部复发率为 0%(95%CI,0%至 11%);4 年无病生存率为 84%(95%CI,67%至 94%)。
结论:对于特定的临床 II 期至 III 期直肠癌患者,新辅助化疗和选择性放疗似乎不会影响预后。目前,在美国合作组网络中,一项验证该经验的随机 III 期试验——术前放疗或选择性术前放疗和化疗前评估(PROSPECT)已开放。
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