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Recessive FANCM cancer syndrome with high cancer risks, chemotherapy toxicity, chromosome fragility and gonadal failure #MMPMID40642874
Nynas E; Sulkava S; Nurmi AK; Suvanto M; Aittomaki K; Nevanlinna H
Genet Med 2025[Jul]; ä (ä): 101521 PMID40642874show ga
PURPOSE: Heterozygous FANCM variants have been associated with breast cancer (BC). Only a few studies have examined other cancer types. Biallelic truncating variants have been linked to a Fanconi anemia (FA)-like cancer prone syndrome in case reports, but the range of cancers and the risk estimates are lacking. METHODS: We studied the association of Finnish-enriched variants c.5101C>T p.(Gln1701Ter) and c.5791C>T p.(Arg1931Ter) with risk of any cancer and FA-related conditions in the FinnGen data with 500,348 individuals. RESULTS: Heterozygous c.5101C>T (N=10,940) was associated with an increased risk of BC (OR = 1.24, P = 2.7x10(-6)) but also with risks of other cancer types including hypopharyngeal (OR = 3.98, P = 3.6x10(-7)), suggesting a risk effect wider than previously described. Homozygous c.5101C>T (N=76) was associated with a high risk of breast, head and neck, gastrointestinal, gynecological, hematologic, skin, and lung cancer, whereas c.5791C>T was rare. Additionally, high recessive risks of ovarian dysfunction and hematologic side effects after cancer treatment were detected, but no risks of bone marrow failure or physical features of FA. CONCLUSION: Based on the pattern of risks associated with biallelic variants, we suggest a novel FANCM cancer syndrome that is separate from FA and other characterized cancer susceptibility syndromes.