Actividad de tirosina-proteina-quinasas en cáncer de mama: comparación con la actividad obtenida en patologías benognas y en tejidos normales / Tyrosina-protein-kinase activity in breath cancer: comparison between benign pathologies and normal tissues activity

Tyrosine protein kinase (TPK) activity is associated to malignant cellular transformation. This work compares TPK activity in 27 surgical biopsy samples of mammary carcinoma, 10 samples of normal mammary tissue. TPK activity was determined in tissue homogenates using (Val5) angiotensin II as exogenous substrate. In samples of mammary carcinoma, TPK activity was 33.86 ñ 31.98 pmol P32/mg protein/30 min. This value was significantly higher that those observed in fibrocystic disease (3.92 ñ 2.35), fibroadenomas (13.86 ñ 10.9) and normal tissue (3.56 ñ 3.02)