PALB2 and thyroid cancer: 2/6 (33.3%) carriers of PALB2 variants had cutaneous melanoma before the age of 40 years, and 2/10 (20%) individuals with ATM variants had thyroid cancer before that age, but an analysis of 182 melanoma families demonstrated only one pathogenic PALB2 variant,44 and thyroid malignancies have not been reported at increased frequency in carriers of homozygous or heterozygous ATM variants.1, 45