PPARD and transitional cell carcinoma: Moreover, Elie-Caille et al., using RTqPCR and Western blot analyses, showed that the peroxisome proliferator-activated receptor β/δ (PPARβ/δ) agonist GW501516 significantly reduced the expression of N-cadherin in the transitional cell carcinoma of the urinary epithelium of the bladder [179].