New methods for treating patents for urothelial cancer (UC) include combining selected phenotypic variables with levels of genotypic expression into a metric, the “G+P INDEX.” The G+P INDEX combines age, sex, smoking history, presence of hematuria, and frequency of hematuria with genotypic expression of the genetic markers, MDK, CDC2, HOXA13, IGFBP5, and optionally IL8Rb, then determining of the G+P INDEX value obtained for a patient is within one of three groups, either: (1) at High Risk of UC, (2) at Risk of UC, or (3) at Low Risk of UC. For groups 1 and 2, further clinical and laboratory work up or treatment is indicated, and patients in group 3 are monitored periodically to determine the need for further clinical workup. Using the G+P INDEX can save substantial time, effort, and funds by avoiding unnecessary medical diagnostic procedures for patients having or are at risk for developing UC.