[1] Univ Texas MD Anderson Canc Ctr, Dept Surg Oncol, Houston, TX 77030 USA
[2] Univ Texas MD Anderson Canc Ctr, Dept Pathol, Houston, TX 77030 USA
[3] Univ Texas MD Anderson Canc Ctr, Dept Gastrointestinal Med Oncol, Houston, TX 77030 USA
[4] Univ Texas MD Anderson Canc Ctr, Dept Urol, Houston, TX 77030 USA
[5] Med Coll Wisconsin, Dept Surg, Milwaukee, WI 53226 USA
[6] Univ Texas MD Anderson Canc Ctr, Dept Genitourinary Med Oncol, Houston, TX 77030 USA