While associations between genetic variations associated with this gene and fatigue have not been evaluated in patients undergoing chemotherapy, in a genome‐wide association study (GWAS) of patients with ME/CFS, genetic variations in SLCO3A1 (rs8029503, p < 5.66 × 10−11) were associated with a diagnosis of ME/CFS [126]. Here, SLCO3A1 is linked to myalgic encephalomeyelitis/chronic fatigue syndrome.