Trans-ancestral genetic study of diabetes mellitus risk in survivors of childhood cancer: a report from the St. Jude Lifetime Cohort and the Childhood Cancer Survivor Study
Im, C.; Neupane, A.; Baedke, J. L.; Delaney, A.; Dixon, S. B.; Chow, E. J.; Mostoufi Moab, S.; Richard, M. A.; Gramatges, M. M.; Lupo, P. J.; Sharafeldin, N.; Bhatia, S.; Armstrong, G. T.; Hudson, M. M.; Ness, K. K.; Robison, L. L.; Yasui, Y.; Wilson, C. L.; Sapkota, Y.
Show abstract
Type 2 diabetes mellitus (T2D) is an established late effect of treatment for childhood cancer. Leveraging detailed cancer treatment and whole-genome sequencing data among survivors of childhood cancer of European (EUR) and African (AFR) genetic ancestry in the St. Jude Lifetime Cohort (N=3,676; 304 cases), five novel diabetes mellitus (DM) risk loci were identified with independent trans-/within-ancestry replication, including in 5,965 survivors of the Childhood Cancer Survivor Study. Among these, common risk variants at 5p15.2 (LINC02112), 2p25.3 (MYT1L), and 19p12 (ZNF492) modified alkylating agent-related risks across ancestry groups, but AFR survivors with risk alleles experienced disproportionately greater risk of DM (AFR, variant ORs: 3.95-17.81; EUR, variant ORs: 2.37-3.32). Novel risk locus XNDC1N was identified in the first genome-wide DM rare variant burden association analysis in survivors (OR=8.65, 95% CI: 3.02-24.74, P=8.1x10-6). Lastly, a general-population 338-variant multi-ancestry T2D polygenic risk score was informative for DM risk in AFR survivors, and showed elevated DM odds after alkylating agent exposures (quintiles: combined OREUR=8.43, P=1.1x10-8; ORAFR=13.85, P=0.033). This study supports future precision diabetes surveillance/survivorship care for all childhood cancer survivors, including those with AFR ancestry.
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