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Langer CJ, Stephenson P, Thor A, Vangel M, Johnson DH; Eastern Cooperative Oncology Group Study 2598.Langer CJ, et al.J Clin Oncol. 2004 Apr 1;22(7):1180-7. doi: 10.1200/JCO.2004.04.105. Epub 2004 Feb 23.J Clin Oncol. 2004.PMID: 14981103Clinical Trial.