CYSLTR1 and transitional cell carcinoma: Overexpression of a cysteinyl leukotriene receptor, CysLT1R, has been shown in colorectal cancer, prostate cancer, renal cell carcinoma, transitional cell carcinoma and testicular cancer, and montelukast induces apoptosis of these cancer cells8, 9, 10, 11, 12, 13, 14.