[1] Johns Hopkins Univ, Sch Med, Dept Oncol, Baltimore, MD 21287 USA
[2] Sidney Kimmel Comprehens Canc Ctr, Baltimore, MD 21287 USA
[3] Johns Hopkins Univ, Sch Med, Dept Surg, Baltimore, MD 21287 USA
[4] Johns Hopkins Univ, Sch Med, Dept Dermatol, Baltimore, MD 21287 USA
[5] Johns Hopkins Univ, Sch Med, Dept Oncol, Div Biostat & Bioinformat, Baltimore, MD 21287 USA
[6] Johns Hopkins Univ, Sch Med, Dept Pathol, Baltimore, MD 21287 USA