label: NTHL1-deficiency tumor predisposition syndrome
label_lc: nthl1-deficiency tumor predisposition syndrome
description: Biallelic constitutional/germline loss-of-function NTHL1 variants confer predisposition to tumor formation demonstrating ‘COSMIC Signature 30’ mutation profile. Tumors have been reported at multiple primary sites; in particular adenomatous polyposis of colon (~10-50 polyps), colorectal cancer, and breast cancer.