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Papillary thyroid carcinoma usually is sporadic, but may occur in a familial form. The complete clinical and pathological phenotype of familial papillary thyroid carcinoma (fPTC) has not been determined, and the susceptibility gene(s) is unknown. We investigated the clinical and pathological characteristics of an unusually large three- generation fPTC kindred to characterize more fully the clinical phenotype. We performed linkage analysis to determine the chromosomal location of a fPTC susceptibility gene. In addition to the known association of fPTC with nodular thyroid disease, we observed the otherwise rare entity of papillary renal neoplasia (PRN) in two kindred members, one affected with PTC and the other an obligate carrier. The multifocality of PRN in one subject adds weight to the likelihood of a true genetic predisposition to PRN. Both genetic linkage and sequence analysis excluded MET, the protooncogene of isolated familial PRN, as the cause of the fPTC/PRN phenotype. A genome-wide screening and an investigation of specific candidate genes demonstrated that the fPTC/PRN phenotype was linked to 1q21. A maximum three-point log of likelihood ratio score of 3.58 was observed for markers D1S2343 and D1S2345 and for markers D1S2343 and D1S305. Critical recombination events limited the region of linkage to approximately 20 cM. A distinct inherited tumor syndrome has been characterized as the familial association of papillary thyroid cancer, nodular thyroid disease, and papillary renal neoplasia. The predisposing gene in a large kindred with this syndrome has been mapped to 1q21.

Papillary Thyroid Carcinoma Associated with Papillary Renal Neoplasia: Genetic Linkage Analysis of a Distinct Heritable Tumor Syndrome*