Abstract: Background: Gender dimorphism and marital status on colorectal cancer mortality have 9 been previously documented, but the relationship between these factors and DNA mismatch repair 10 protein (MMRP) expression status is unknown. Methods: Colectomy specimens were reviewed ret- 11 rospectively for patients between 2018 to 2023 with demographics including race/ethnicity, gender, 12 marital status, faith, body mass index, pathologic staging, and MMRP expression status. Statistical 13 analyses were performed by using baseline characteristics tables and various programs in R-pack- 14 age. Results: A total 1018 colectomies were reviewed, and the tumor stages were significantly higher 15 in right colon (stage 3 and 4) than those in left colon and rectosigmoid colon (p<0.01). Marital status 16 was significantly associated with patients’ gender, age, tumor size and tumor stages (all p<0.01). 17 MMRP status were available in 775 cases, and 139 (17.9%) were MMRP deficient, and 636 (82%) 18 MMRP proficient. MMRP deficiency was significantly associated with older female patients, larger 19 tumor in size, higher tumor stages, higher histologic grade and more common in right colon (all 20 p<0.01). In addition, MMRP deficiency was statistically associated with higher percentage of di- 21 vorced and widowed patients (p<0.01). Multivariate linear regression analysis revealed persistent 22 association of MMRP deficiency with tumor size, tumor grade, tumor stage and nodal metastasis, 23 but the associations with gender and marital status no longer existed. Conclusion: The differences 24 in prevalence of CRC by gender and marital status and tumor MMRP status illustrate the im- 25 portance of these factors on tumor stages and nodal metastasis but these associations were more 26 complex with other confounding factors.