ABCG2 and Absence of circulating granulocytes: This case suggests that genetic variants in renal transporters ABCG2 (exonic non-synonymous variant, rs2231137), SLC29A1 (rs747199 and rs628031), and ABCC4 (3′UTR SNP, rs3742106 and rs11568658) may contribute to drug-induced agranulocytosis.