Quantification of EGFR family in canine mammary ductal carcinomas in situ: implications on the histological graduation.

The epithelial growth factor receptors are transmembrane proteins with an important role in the neoplastic progression of tumors, and in this context, DCIS is an important phase in the progression of canine mammary tumors. Studies on the molecular profile and its relationship to a progression of canine mammary tumors are important to improve the treatment of patients and for a better understanding of canine mammary carcinogenesis. The aim of this study was to determine, by immunohistochemistry, the relation between the expression of EGFR, ErbB-2, ErbB-3, and ErbB-4 in 52 canine mammary gland DCIS with high and low histological grade. A positive correlation between histological grade and expression of membrane ErbB-2 and cytoplasmic ErbB-4 was observed. Increased ErbB-4 membrane expression was correlated with increased ErbB-3 expression in low and high-grade DCIS. Our data suggest that increased expression of ErbB-2 and ErbB-4 may be related to more aggressive DCIS and probabily involved with canine mammary neoplastic progression.

Carcinoma ductal in situ de la mama: primeros 100 casos Ceclines / Ductal in situ carcinoma of breast: 100 first cases Ceclines

Describir los primeros 100 casos de carcinoma ductal in situ en nuestra institución. 100 casos tratados adoptamos la definición de mic de Silver y Tavassoli: 77 fueron puros y 23 mic. En 69 por ciento se practicó cirugía preservadora, 31 por ciento mastectomía, 24 por ciento con reconstrucción, una bilateral y 7 por ciento sin reconstrucción. 64 por ciento recibió radioterapia complementaria. 36 por ciento el tratamiento fue cirugía sola. 77 por ciento recibieron terapia hormonal adyuvante. En 46 por ciento practicamos biopsia de ganglio centinela: 25 por ciento in situ puros y 21 por ciento mic. En 83 por ciento la presentación fue micro calcificaciones. El patrón histológico cribiforme y mixtos, los más frecuentes, 75 por ciento. El tamaño mamográfico e histológico coincidieron, 20 mm, promedio. El 87 por ciento grado nuclear II o III actividad mitótica 82 por ciento fue baja o moderada sólo 4 por ciento alta. El 78 por ciento presentó necrosis. De 25 pacientes con in situ puro, que se les practicó ganglio centinela ninguna presentó enfermedad ganglionar y los 21 con in situ mic, 9,52 por ciento presentaron metástasis. 2 por ciento recaídas locales, con enfermedad infiltrante; una a 52 meses, los otros a 58 meses. Una sin radioterapia, se trataron con mastectomía de rescate. No ocurrieron muertes por enfermedad. El buen manejo de los casos, traduce satisfactorios resultados de sobre vida libre de enfermedad y sobrevida global. Podemos seleccionar un sub-grupo de pacientes a quienes les pueda omitir la radioterapia sin aumentar el riesgo de mortalidad.

Describe first 100 cases of ductal carcinoma in situ in our institution. 100 cases treated adopted the definition of mic by Silver and Tavassoli: 77 pure and 23 mic. 69 percent we performed breast conserving surgery 31 percent total mastectomy 24 percent reconstruction, 1 was bilateral, 7 percent without reconstruction. 64 percent received complementary radiotherapy. 36 percent treatment was surgery alone. 77 percent recieved hormonal adjuvant therapy. 46 percent we performed sentinel lymph node biopsy: 25 percent were pure and 21 percent mic. 83 percent initial form of presentation was micro calcifications. The histological type was cribiform and mixed (75 percent). The mammographic and histological size matched 20 mm average. 87 percent were nuclear grade II and III, 82 percent of the mitotic activity was moderate or low only 4 percent were high. 78 percent had necrosis. Out of the 25 patients with pure in which we practice none presented ganglion disease and out of the 21 patients with mic, 9.52 percent presented ganglion metastasis. 2 percent had local recurrence, both of them with invasive disease, one 52 months the other one at 58 month from surgery. One didn´t received radiation. Both were treated with rescue mastectomy. There was no death diseases related. Adequate and good management of cases results related to disease free survival and overall survival. We can classify sub group of patients in which may avoid radiation without increasing the risk of mortality.