HRH1 and urinary bladder neoplasm: The mRNA expression of TPRG1, cyclooxygenase (COX)1, COX2, mitogen-activated protein kinase (MAPK) 14, cyclin D1 (CCND1), histamine receptor H1 (HRH1), poly(ADP-ribose) polymerase 1 (PARP1), cyclin-dependent kinase 1 (CDK1) and Raf-1 Proto-Oncogene, Serine/Threonine Kinase (RAF) was increased in the CG group compared with normal bladder specimens obtained from patients undergoing transurethral bladder tumor resection (Normal group) (Figure 1A).