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Shapiro CL, Gelman RS, Hayes DF, Osteen R, Obando A, Canellos GP, Frei E 3rd, Henderson IC.Shapiro CL, et al.J Natl Cancer Inst. 1993 May 19;85(10):812-7. doi: 10.1093/jnci/85.10.812.J Natl Cancer Inst. 1993.PMID: 8487326Clinical Trial.