Objective To analyze the clinical and biological features of familial nonmedullary thyroid carcinoma(FNMTC).Methods Clinical data of 66 FNMTC cases of 32pedigrees was retrospectively analyzed,compared with that of 182 control cases taken randomly from the patients with sporadic papillary thyroid carcinoma(SPTC),who Objective To analyze the clinical and biological features of familial nonmedullary thyroid carcinoma (FNMTC). Methods Clinical data of 66 FNMTC cases of 32 pedigrees was retrospectively analyzed, compared with that of 182 control cases taken randomly from the patients with sporadic papillary thyroid carcinoma (SPTC) , who