RPN1 and rectal cancer: The crossing point (CP) value in rectal cancer samples for GAPDH ranges from 13.69 to 17.18, CP value for PUM1 ranges from 18.37 to 21.52, CP value for B2M ranges from 9.72 to 14.53, CP value for RPN1 ranges from 16.66 to 19.64, and CP value for PMM1 ranges from 19.89 to 23.71 as represented in Table 2.