Expression of Cyclin D1 in Colorectal Cancer and Its Association With Clinicopathologic Parameters in Patients Underwent Colectomy

Colorectal cancer (CRC) is common cancer with a high mortality rate worldwide. Cyclin D1 is a gene that regulates cell cycle passage from stage G1 to S (G1/S checkpoint) and has recently been linked to the prognosis of a variety of cancers. Therefore, the aim of this study was to investigate the expression of cyclin D1 in colorectal cancers and its relationship with clinicopathologic factors. In this retrospective study, paraffin blocks of tumors of consecutive CRC patients registered in the histopathology laboratory of hospitals affiliated with Ahvaz Jundishapur University of Medical Sciences were used. Patients' clinicopathologic findings were extracted from their files, and using paraffin blocks, specific staining for cyclin D1 was performed using the immunohistochemistry method. Data were analyzed by SPSS software. In terms of staining, 11 samples (28.9%) scored 4, 11 samples (28.9%) scored 3, 8 samples (1/21%) scored 2, 3 samples (7.9%) scored 1, and 5 samples (2/13٪) scored zero. Staining intensity was severe in 10 cases (26.3%), moderate in 14 cases (36.8%), mild in 8 cases (21.1%), and negative in 6 cases (15.8%). The severity and extent of staining had no significant relationship with sex, age, tumor location, degree of differentiation (grade), depth of invasion, tumor size, lymph node involvement, and vascular and perineural invasion (P>0.05). Despite the high expression of cyclin D1 in colorectal carcinoma, no significant relationship was observed between its expression and prognostic factors, which is probably due to the small sample size.