We have shown that WT-161, a histone deacetylase 6 (HDAC6) inhibitor, shows remarkable anti-tumor activity in multiple myeloma (MM) in preclinical models. However, its activity in other type of cancers has not yet been shown. In this study, we further evaluated the biologic sequelae of WT161 in breast cancer cell lines. WT161 triggers apoptotic cell death in MCF7, T47D, BT474, and MDA-MB231 cells, associated with decreased expression of EGFR, HER2, and ERα and downstream signaling. However, HDAC6 knockdown shows that cytotoxicity and destabilization of these receptors triggered by WT161 are not dependent on HDAC6 inhibition. Moreover WT161 analog MAZ1793, which lacks HDAC inhibitory effect, similarly triggers cell line growth inhibition and downregulation of these receptors. We also confirm that WT161 significantly inhibits in vivo MCF7 cell growth, associated with downregulation of ERα, in a murine xenograft model. Finally, WT161 synergistically enhances bortezomib-induced cytotoxicity, even in bortezomib-resistant breast cancer cells. Our results therefore provide the rationale to develop a novel class of therapeutic agents targeting growth pathways central to the pathogenesis of breast cancer.

En este trabajo se presentan los resultados de un estudio empírico realizado en Castilla y León, mediante la aplicación de dos técnicas estadísticas a una muestra de clientes de entidades financieras implantadas en dicha Comunidad, con el fin de valorar el riesgo de crédito. A su vez, se determina el método que permite discriminar mejor entre clientes morosos y no morosos, lo que se realiza a partir de una serie de factores que influyen en el comportamiento de pago de los clientes.Palabras clave: riesgo de crédito, morosidad, análisis discriminante, regresión logística.In this paper we present the results of an empirical study of the region of Castilla & León (Spain), through the application of two statistical techniques to a sample of costumers of financial institutions settled in the said region, in order to evaluate the credit risk. On the other hand, we determine the method that better discriminates between default and non-default costumers, what is obtained through a series of factors that influence on their payment behaviour.

No abstract

Background: Cytoplasmatic expression of Aldehyde dehydrogenase 1 A1 (ALDH1A1) has been identified as a cancer stem cell marker and related to an unfavorable prognosis. However, nuclear expression of ALDH1A1 has not been described in breast cancer (BC) patients yet. Methods: A retrospective, historical cohort study of patients diagnosed with early or locally advanced triple negative (TN) and human epidermal growth factor receptor 2 positive (HER2+) BC treated with neoadjuvant chemotherapy was conducted. Patients who had an available tumor sample from the diagnosis and who underwent surgery after the neoadjuvant treatment were included. Metastatic patients and non-evaluative biopsy sample cases were excluded. Immunostaining against ALDH1A1 was performed. The aim of this study was to assess the expression of nuclear ALDH1A1 in BC and its relation with clinicopathological features and outcomes.Results: 75 patients were analyzed (100% women, mean age 53.6±11.7 years, 42.7% TN, 57.3% HER2+ tumors). 28% had obesity, 32 (42.7%) had a tumor size ≤5 cm and 52 (69.3%) positive lymph nodes. 40 (53.3%) patients had cytoplasmatic ALDH1A1 expression. From them, 18 (24%) also expressed nuclear ALDH1A1 staining and 22 (29.3%) only had cytoplasmatic expression. 57 (76%) patients had negative nuclear ALDH1A1. At the end of the follow-up (54.4 [38.3-87.6] months), 47 patients (62.7%) remained disease free and 20 (26.7%) died. Patients with nuclear ALDH1A1 had higher prevalence of obesity when comparing to exclusively positive cytoplasmatic ALDH1A1 (p = 0.003) and versus those with negative ALDH1A1 expression (p = 0.017); and also, smaller size compared to those without nuclear ALDH1A1 staining (p = 0.044). Furthermore, in patients with positive nuclear ALDH1A1 a tendency to superior disease-free survival (DFS) and overall survival (OS) was observed when compared to positive cytoplasmatic and negative ALDH1A1 tumors, albeit not statistically significant. Conclusions: In this cohort, nuclear positive expression of ALDH1A1 was higher in patients with obesity and smaller tumors. Patients with positive nuclear ALDH1A1 carcinomas appear to have better DFS and OS, although this was not statistically significant. Further research studies are needed to understand the functions of this enzyme and its possible role as a predictive and prognostic marker in BC.

Background: Cytoplasmatic expression of Aldehyde dehydrogenase 1 A1 (ALDH1A1) has been identified as a cancer stem cell marker and related to an unfavorable prognosis. However, nuclear expression of ALDH1A1 has not been described in breast cancer (BC) patients yet. Methods: A retrospective, historical cohort study of patients diagnosed with early or locally advanced triple negative (TN) and human epidermal growth factor receptor 2 positive (HER2+) BC treated with neoadjuvant chemotherapy was conducted. Patients who had an available tumor sample from the diagnosis and who underwent surgery after the neoadjuvant treatment were included. Metastatic patients and non-evaluative biopsy sample cases were excluded. Immunostaining against ALDH1A1 was performed. The aim of this study was to assess the expression of nuclear ALDH1A1 in BC and its relation with clinicopathological features and outcomes.Results: 75 patients were analyzed (100% women, mean age 53.6±11.7 years, 42.7% TN, 57.3% HER2+ tumors). 28% had obesity, 32 (42.7%) had a tumor size ≤5 cm and 52 (69.3%) positive lymph nodes. 40 (53.3%) patients had cytoplasmatic ALDH1A1 expression. From them, 18 (24%) also expressed nuclear ALDH1A1 staining and 22 (29.3%) only had cytoplasmatic expression. 57 (76%) patients had negative nuclear ALDH1A1. At the end of the follow-up (54.4 [38.3-87.6] months), 47 patients (62.7%) remained disease free and 20 (26.7%) died. Patients with nuclear ALDH1A1 had higher prevalence of obesity when comparing to exclusively positive cytoplasmatic ALDH1A1 (p = 0.003) and versus those with negative ALDH1A1 expression (p = 0.017); and also, smaller size compared to those without nuclear ALDH1A1 staining (p = 0.044). Furthermore, in patients with positive nuclear ALDH1A1 a tendency to superior disease-free survival (DFS) and overall survival (OS) was observed when compared to positive cytoplasmatic and negative ALDH1A1 tumors, albeit not statistically significant. Conclusions: In this cohort, nuclear positive expression of ALDH1A1 was higher in patients with obesity and smaller tumors. Patients with positive nuclear ALDH1A1 carcinomas appear to have better DFS and OS, although this was not statistically significant. Further research studies are needed to understand the functions of this enzyme and its possible role as a predictive and prognostic marker in BC.