The rs10041917 variant in SERINC5 was in linkage disequilibrium with a variant (rs111876221) previously reported to be associated with sulfasalazine-induced agranulocytosis (D’ = 1.0, p = 0.0068) as determined using the LDpair tool in LDlink using 1000 Genomes project data from European populations (https://ldlink.nci.nih.gov/?tab=ldpair). This evidence concerns the gene SERINC5 and Absence of circulating granulocytes.