Abstract
534 Background: The purpose was to identify predictors of non-adherence to MSI testing in young CRC patients and identify factors associated with an increased risk of high microsatellite instability (MSI-H) disease. Methods: Patients 18-49 years old diagnosed with invasive colorectal adenocarcinoma between 2010-2012 and known MSI testing status were identified using the National Cancer Data Base. Multivariable logistic regression was used to identify independent predictors of receipt of MSI testing, as well as MSI-H status among those tested. Results: Among 17,218 patients identified, only 7,422 (43%) underwent MSI testing; the proportion of patients tested increased between 2010 (36%) and 2012 (48%; p < 0.001). Higher educational level, early stage disease, and number of regional lymph nodes examined > 12 were independently associated with MSI testing, whereas older age (40-49), Hispanic ethnicity, non-private insurance status, non-academic/research facility, facility location, rectosigmoid/rectal tumor location, non-mucinous histology, unknown grade, non-receipt of definitive surgery were associated with underuse. Among 6,358 tested patients with known MSI status, 531 (8%) patients had MSI-H disease. Lower income, previous cancer history, and stage II disease were independently associated with MSI-H status, whereas older age (40-49), female sex, advanced comorbidity, non-metropolitan facility status, facility location, distal tumor location, non-mucinous histology, unknown/lower tumor grade, and non-receipt of chemotherapy were inversely associated with MSI-H status. Conclusions: Despite national guidelines, significant underuse of routine MSI testing in young patients diagnosed with colorectal cancer persists. Interventions are warranted to improve adherence to guideline-based care in these patients, particularly among those at increased risk of MSI-H disease. [Table: see text]
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