Cáncer gástrico y regulación del crecimiento tumoral: estudio de marcadores de proliferación celular y del complejo proteínas p53/p21WAF1/CIP1/mdm-2 / Gastric cancer and tumor growth regulation: study of cell proliferation markers and protein complex p53/p21WAF1/CIP1/mdm-2
Rev. méd. Chile
;
128(2): 127-36, feb. 2000. ilus, tab
Article
Dans Espagnol
| LILACS
| ID: lil-258109
RESUMO
Gastric cancer and tumor growth regulation. Study of cell proliferation markers and protein complex p53/p21WAF1/CIP1/mdm-2. Background:
p53/p21WAF1/CIP1 and mdm-2 proteins play an important role in cell cycle regulation. The study of the pathogenesis of gastric cancer is important to understand how these tumors progress during their natural history.Aim:
To study the relationship between the immunohistochemical expression of p53/p21WAF1/CIP1 and mdm-2 and cell proliferation in gastric cancer. Material andmethods:
Fifty one gastrectomy specimens with gastric cancer were studied using immunohistochemistry for p53/p21WAF1/CIP1 and mdm-2. Cell proliferation was determined by immunolabelling with PCNA and Ki67 antigens. Mitosis figures were counted in 10 high power microscopic fields.Results:
Patients from whom gastric cancer specimens were obtained had a mean age of 59.3 years. Ki67 and mitosis counting showed the highest correlation index with proliferation indexes studied. No correlation was found between the expression of protein complex p53/p21WAF1/CIP1 and mdm-2 and morphological characteristics of gastric tumors. Mdm-2 protein overexpression was the only marker that showed an independent correlation with cell proliferation. Moreover, mdm-2 positive tumors showed the highest proliferation indexes when p53 was not immunohistochemically over-expressed, as determined by PCNA labelling index.Conclusions:
In gastric cancer, a direct correlation between mdm-2 overexpression and cell proliferation was observed. Moreover, the fact that mdm-2 positive tumors showed the highest cell proliferation when p53 was not overexpressed, entitles us to hypothesize that mdm-2 overexpression could play a major role in gastric carcinogenesis
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Tumeurs de l'estomac
/
Marqueurs biologiques tumoraux
/
Protéines tumorales
Limites du sujet:
Femelle
/
Humains
/
Mâle
langue:
Espagnol
Texte intégral:
Rev. méd. Chile
Thème du journal:
Médicament
Année:
2000
Type:
Article
/
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