title: Variable activity of protein tyrosine kinase in apparently normal thyroid glands.
abstract: We examined protein tyrosine kinase (PTK) activity in apparently normal thyroid tissue (n = 22) obtained from patients undergoing thyroid surgery for papillary thyroid cancer or benign disease. The PTK activity in apparently normal thyroid tissue from patients with papillary thyroid cancer progressively was elevated in the cytosolic fraction compared with that from patients without cancer (p < 0.05). The cytosolic proportion of PTK activity was also significantly increased in the normal thyroid tissue of patients with cancer (62% vs. 51%, p < 0.05). These findings suggest that alterations in PTK activity may indicate apparently normal thyroid tissue at increased risk of developing malignancy.
authors.affiliation: Second Department of Surgery, Hyogo College of Medicine, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Hatada
authors.forename: Y
authors.initials: Y
authors.lastname: Sakanoue
authors.forename: M
authors.initials: M
authors.lastname: Kusunoki
authors.forename: A
authors.initials: A
authors.lastname: Kobayashi
authors.forename: J
authors.initials: J
authors.lastname: Utsunomiya
mesh_terms: D000231:Adenocarcinoma, Papillary / Q000201:enzymology* / Q000601:surgery; D000236:Adenoma / Q000201:enzymology / Q000601:surgery; D000328:Adult; D000368:Aged; D003600:Cytosol / Q000201:enzymology; D005260:Female; D006042:Goiter / Q000201:enzymology / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D011505:Protein-Tyrosine Kinases / Q000032:analysis*; D012307:Risk Factors; D013961:Thyroid Gland / Q000201:enzymology* / Q000601:surgery; D013964:Thyroid Neoplasms / Q000201:enzymology* / Q000601:surgery
chemical_list: D011505:Protein-Tyrosine Kinases