Incidence of statin-associated muscle symptoms in patients taking statins with RYR1 or CACNA1S variants.

Background: Statins are commonly used medications. Variants in SLCO1B1 , CYP2C9 , and ABCG2 are known predictors of muscle effects when taking statins. More exploratory genes include RYR1 and CACNA1S , which can also be associated with disease conditions. Methods: Patients with pathogenic/likely pathogenic variants in RYR1 or CACNA1S were identified through an elective genomic testing program. Through chart review, patients with a history of statin use were assessed for statin-associated muscle symptoms (SAMS) along with collection of demographics and other known risk factors for SAMS. Results: Of the 23 patients who had a pathogenic or likely pathogenic RYR1 or CACNA1S variant found, 12 had previous statin use; of these, SAMS were identified in four patients. Conclusion: These data contribute to previous literature suggesting patients with RYR1 variants may have an increased SAMS risk. Additional research will be helpful in further investigating this relationship and providing recommendations.