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Activating mutations of the Gs alpha gene, termed gsp, have been identified in various endocrine tumors. Recently, a high frequency of gsp mutation in patients with multiple endocrinopathies was reported, and a family with both McCune-Albright syndrome and multiple endocrine neoplasia type 1 was described. Each suggests that the oncogenic mutations of Gs alpha may play an important role in tumorigenesis in patients with multiple neoplastic endocrinopathies, and a search for the gsp mutation in multiple endocrine neoplasia type 1 (MEN1) should be undertaken. We, therefore, reevaluated the frequency of gsp mutations in endocrine tumors of patients with MEN1. Of 18 tumors from 13 patients with MEN1, we found no gsp mutations regardless of heredity. We conclude that the gsp mutation may be uncommon in endocrine tumors of MEN1 patients, and thus, this mutation plays little, if any, role in their tumorigenesis.

Gs alpha mutation may be uncommon in patients with multiple endocrine neoplasia type 1.