[1] Indiana Univ, Sch Med, Div Hematol & Oncol, Melvin & Bren Simon Comprehens Canc Ctr, Indianapolis, IN 46204 USA
[2] Indiana Univ, Sch Med, Dept Biostat & Hlth Data Sci, Indianapolis, IN USA
[3] Genentech Inc, San Francisco, CA 94080 USA
[4] Indiana Univ, Simon Canc Ctr, Indianapolis, IN 46204 USA
[5] Roudebush VAMC, Indianapolis, IN USA
[6] Indiana Univ Sch Med, Indianapolis, IN 46202 USA