TY - JOUR T1 - Histological Grade (HG) in Invasive Ductal Carcinomas of the Breast of Less than 1 cm: Clinical and Biological Associations During Progression from HG1 to HG3 JF - Anticancer Research JO - Anticancer Res SP - 569 LP - 573 VL - 35 IS - 1 AU - ÁLVARO RUIBAL AU - PABLO AGUIAR AU - MARÍA CARMEN DEL RIO AU - JOSÉ IGNACIO ARIAS AU - PRIMITIVA MENÉNDEZ-RODRÍGUEZ AU - FRANCISCO GUDE AU - MICHEL HERRANZ Y1 - 2015/01/01 UR - http://ar.iiarjournals.org/content/35/1/569.abstract N2 - Aim: To study the clinical and biological (cellular proliferation and hormone-dependence) associations during the progression of histological grade (HG), from HG1 to HG3, in invasive ductal carcinomas of the breast (IDC) <1 cm. Patients and Methods: The study group included 119 women with IDCs ≤1 cm, aged between 27 and 88 years (median=61 years). The parameters analyzed were: histological grade (HG1: 52; HG2: 45; HG3: 22); axillary lymph node involvement (N); distant metastasis (M); and immunohistochemical expression of estrogen (ER), progesterone (PR) and androgen (AR) receptors, and Ki67, p53 and B-cell lymphoma 2 (BCL2). Results: Compared to HG3 tumors, HG1s exhibited an increased expression of ER, AR and BCL2, as well as lower expression of p53 and Ki67. In HG1 tumors, significant (p<0.05) associations were found between ER and PR (positive), ER and p53 (negative), ER and Ki67 (negative), PR and AR (positive), PR and p53 (negative), AR and p53 (negative), p53 and BCL2 (negative), and between BCL2 and Ki67 (negative). HG3s only showed significant (p<0.05) associations between ER and Ki-67 (negative) and between BCL2 or Ki-67 (negative). Only two significant relationships (ER–Ki67 and BCL2–Ki67) persisted in all three grades. Conclusion: Our results lead us to the following conclusions: i) compared HG1, HG3 ductal carcinomas exhibited decreased expression of ER, AR and BCL2 and increased expression of p53 and Ki67; and ii) only two significant and negative relations (ER–Ki67 and BCL2–Ki67) persisted in all three grades. ER -