title: p53 in a thyroid follicular carcinoma with foci of poorly differentiated and anaplastic carcinoma.
abstract: The clinical and pathologic features of a rare case of follicular carcinoma with small foci of poorly differentiated and anaplastic carcinoma are presented. Eight years after the removal of the primary neoplasm, the patient developed pulmonary and brain metastases that were predominantly composed of the poorly differentiated and anaplastic components. A comparative immunohistochemical and molecular analysis of p53 status in the follicular, poorly differentiated and anaplastic components of the tumor was performed. p53 immunostaining was restricted to the poorly differentiated and anaplastic areas. Single strand conformation polymorphism analysis (SSCP-PCR) from DNA obtained by microdissection demonstrated the presence of a mutation (TAT-->TGT; Tyr-->Cys) in codon 220, exon six of the p53 gene in the anaplastic component, that was absent in the well-differentiated follicular areas. The results of that study in this rare tumor support that p53 has a tumor progression role in thyroid tumorigenesis.
authors.affiliation: Department of Pathology, Hospital de la Santa Creu i Sant Pau, Universitat Autonoma de Barcelona, Spain.
authors.forename: X
authors.initials: X
authors.lastname: Matias-Guiu
authors.forename: A
authors.initials: A
authors.lastname: Villanueva
authors.forename: M
authors.initials: M
authors.lastname: Cuatrecasas
authors.forename: G
authors.initials: G
authors.lastname: Capella
authors.forename: A
authors.initials: A
authors.lastname: De Leiva
authors.forename: J
authors.initials: J
authors.lastname: Prat
mesh_terms: D018263:Adenocarcinoma, Follicular / Q000235:genetics / Q000378:metabolism* / Q000556:secondary; D001932:Brain Neoplasms / Q000235:genetics / Q000378:metabolism / Q000556:secondary*; D002277:Carcinoma / Q000235:genetics / Q000378:metabolism* / Q000556:secondary; D002454:Cell Differentiation; D006801:Humans; D007150:Immunohistochemistry; D008175:Lung Neoplasms / Q000235:genetics / Q000378:metabolism / Q000556:secondary*; D008297:Male; D008875:Middle Aged; D017354:Point Mutation; D018807:Polymorphism, Single-Stranded Conformational; D013954:Thyroglobulin / Q000378:metabolism; D013964:Thyroid Neoplasms / Q000235:genetics / Q000473:pathology*; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*
chemical_list: D016159:Tumor Suppressor Protein p53; D013954:Thyroglobulin