17 research outputs found

    Pregnancy in acromegaly

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    Expression of p53, Ki-67 and c-erb B2 in growth hormone-and/or prolactin-secreting pituitary adenomas Expressão de p53, Ki-67 e c-erb B2 em adenomas hipofisários secretores de prolactina e/ou hormônio de crescimento

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    The subcellular events implicated on the formation and behavior of pituitary adenomas are not fully understood. In this study we investigated the presence of p53, Ki-67 and c-erb B2 in 38 pituitary adenomas with immunohistochemical positivity for GH and prolactin (n=26; 68.4%), for prolactin (n=9; 23.7%) and for GH (n=3. 7.8%). The analyses revealed the following results: 24 (63.2%) tumors expressed variable positivity for c-erb B2, 11 (28.9%) expressed p53 positivity and 11 (28.9%) tumors were variably positive for Ki-67. Our results demonstrated a high percentage of GH/prolactin-, prolactin- and GH-secreting tumors with immunohistochemical positivity for c-erb B2. Once this membrane receptor is related to growth factors EGF and TGFalpha and both have a definite effect on tumor growth, our data suggest a possible role for c-erb B2 on the evolution of these tumors.<br>Os eventos subcelulares implicados na formação e comportamento dos adenomas hipofisários não são completamente compreendidos. Neste estudo nós investigamos a presença de p53, Ki-67 e c-erb B2 em 38 adenomas hipofisários com positividade imuno-histoquímica para GH e prolactina (n=26, 68,4%), para prolactina (n=9, 23,7%) e para GH (n=3, 7,8%). A análise revelou os seguintes resultados: 24 tumores (63,2%) expressaram positividade variável para c-erb B2, 11 (28,9%) expressaram positividade para p53 e 11 tumores (28,9%) foram variavelmente positivos para Ki-67. Nossos resultados demonstraram elevada percentagem de tumores secretores de GH/prolactina, prolactina e GH com positividade imuno-histoquímica para c-erb B2. Desde que este receptor de membrana está relacionado aos fatores de crescimento EGF e TGFalfa e ambos têm efeito definido no crescimento tumoral, nossos dados sugerem possível função para o c-erb B2 na evolução destes tumores

    How does pregnancy affect the patients with pituitary adenomas: a study on 113 pregnancies from Turkey

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    Objective Data regarding pregnancies in relation to pituitary tumors are limited. The effects of pregnancy on pituitary adenomas and the effects of adenoma itself (hormonal activity, mass effects and pituitary insufficiency) and/or treatment on the ongoing gestation and developing fetus were evaluated
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