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Breast Cancer (Auckl) ; 12: 1178223418788074, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30083055


The association between pathologic complete response (pCR) following to neoadjuvant chemotherapy (NAC) and the improved survival in breast cancer has been previously reported. The aim of this study was is to explore the expression of several biomarkers described during epithelial-mesenchymal transition (EMT) and the achievement of pCR in different molecular subtypes of breast cancer. We identified archived pathology tissue from patients with breast cancer who received NAC during the year 2014. We performed immunohistochemical analysis of vimentin, nuclear factor κB (NF-κB), epidermal growth factor receptor (EGFR), E-cadherin, estrogen receptor (ER), progesterone receptor, and Her2neu and studied the association between the expression of these markers and pCR. A Fisher exact test for categorical cofactors, an unpaired t test and a nonparametric Wilcoxon test for continuous cofactors were used. The results showed a significant expression of vimentin in triple-negative breast cancer (TNBC; P = .023). An inverse correlation between vimentin and the ER expression (P = .032) was observed. No significant association was noted for vimentin, NF-κB, EGFR, and E-cadherin was associated with pCR. This study suggests that the evaluated EMT related biomarkers are not associated with pCR after NAC chemotherapy in an unselected breast cancer population. Vimentin and NF-κB expressions were associated with TNBC and could be further explored as potential therapeutic targets in this subgroup. A prevalence of vimentin and NF-κB among Hispanic patients with breast cancer warrants further investigation as a possibly contributing to the prevalence of TNBC and adverse prognosis in this population.

Cancer Med ; 7(6): 2710-2717, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-29733543


Breast cancer (BC) is the leading cause of cancer death in Hispanic/Latino women nationwide. Hispanic women are more likely to be presented with advanced disease and adverse prognosis subtypes. The aim of this study is to describe the clinico- pathological characteristics and disparities in breast cancer in this group at two tertiary care University-based medical centers. After IRB approval, Cancer registry was used to analyze the variables of 3441 patients with breast cancer diagnosed and treated consecutively at two large tertiary University based medical and cancer center database centers in El Paso, TX and Loma Linda, CA between 2005 and 2015. Association between race/ethnicity and cancer type, stage, hormone receptor status and treatment option were investigated. Overall 45.5% of the patients were Hispanic (n: 1566) and those were more likely to be diagnosed at a younger age (57 years) similar to African Americans, more likely to have invasive ductal carcinoma type (82.7%) & triple negative disease (17.1%, 95%CI: 15% to 19%). 58.8% of Hispanics (95%CI: 56% to 61%) have hormone receptor (HR)+ & HER2- as opposed to 71% in non-Hispanic White people. In addition, Hispanic individuals presented with advanced stages of BC (25.3%, 95% CI: 23% to 28%) similar to African American (25.4%), and had a lower proportion of lumpectomy (50%) similar to African American (50%). When compared to African American patients, Hispanic patients had a higher prevalence of triple negative BC (17.11% in Hispanics Versus 13.86% in African American). CONCLUSION: Hispanics had significantly higher relative risk of advanced stages at presentation (Relative Risk Ratio (RRR) = 2.05, P < 0.001), triple negative tumors (RRR = 2.64, P < 0.0001), HER2 + /HR - disease (RRR = 1.77, P < 0.0001), and less HR+ /HER2- BC (RRR = 0.69, P < 0.0001). Hispanics and African Americans are diagnosed with breast cancer at a younger age, have a higher prevalence of Triple negative breast cancer, and are diagnosed at more advanced stages of disease. Increasing awareness and targeting minority populations for health promotion interventions, screening and early detection continue to be of paramount importance to reduce the burden of health disparities.

Neoplasias da Mama/epidemiologia , Disparidades em Assistência à Saúde , Hispano-Americanos , Afro-Americanos , Idoso , Biomarcadores Tumorais , Neoplasias da Mama/metabolismo , Neoplasias da Mama/patologia , Neoplasias da Mama/terapia , Gerenciamento Clínico , Grupos Étnicos , Feminino , Humanos , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Prognóstico
Nutr Cancer ; 69(6): 819-824, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28718665


INTRODUCTION: Low level of vitamin D (VD) has been linked with a higher risk of cancers. The aim of this study was to assess the prevalence of low VD in patients with breast cancer in a predominantly Mexican Hispanic/Latino patient population, a fast growing and relatively understudied population. MATERIALS/METHODS: We sought to evaluate the serum VD levels in breast cancer patients diagnosed at the Texas Tech University Breast Cancer Center in El Paso, TX, between May 2013 and May2014 via a retrospective chart review of the Electronic Medical Records. RESULTS: We identified a total of 83 consecutive breast cancer patients with available VD levels. Mean age 57 yr, 94% were Hispanics. VD was insufficient (<30 ng/ml) in 86% of patients (95% CI: 0.76-0.92) and it was deficient (<20 ng/ml) in 39% (95% CI: 0.28-0.50). CONCLUSION: VD deficiency is widely prevalent in Hispanic/Latino patients with breast cancer. This is quite alarming in view of possible increased risk of cancer with low VD and potentially worse cancer outcomes. This calls for increased efforts to screen for, diagnose, and treat VD deficiency in this patient population. Further pharmacogenomics studies are warranted to explore the underlying etiology of VD deficiency in this paradoxically sunny region.

Neoplasias da Mama/sangue , Americanos Mexicanos , Deficiência de Vitamina D/sangue , Deficiência de Vitamina D/etnologia , Adulto , Idoso , Neoplasias da Mama/complicações , Feminino , Humanos , Pessoa de Meia-Idade , Prevalência , Estudos Retrospectivos , Texas/epidemiologia , Deficiência de Vitamina D/complicações
Oncotarget ; 8(4): 6446-6460, 2017 Jan 24.
Artigo em Inglês | MEDLINE | ID: mdl-28031536


Previous studies suggest beta-adrenergic receptor (ß-AR) antagonists (ß-blockers) decrease breast cancer progression, tumor metastasis, and patient mortality; however the mechanism for this is unknown. Immunohistochemical analysis of normal and malignant breast tissue revealed overexpression of ß1-AR and ß3-AR in breast cancer. A retrospective cross-sectional study of 404 breast cancer patients was performed to determine the effect of ß-blocker usage on tumor proliferation. Our analysis revealed that non-selective ß-blockers, but not selective ß-blockers, reduced tumor proliferation by 66% (p < 0.0001) in early stage breast cancer compared to non-users. We tested the efficacy of propranolol on an early stage breast cancer patient, and quantified the tumor proliferative index before and after treatment, revealing a propranolol-mediated 23% reduction (p = 0.02) in Ki67 positive tumor cells over a three-week period. The anti-proliferative effects of ß-blockers were measured in a panel of breast cancer lines, demonstrating that mammary epithelial cells were resistant to propranolol, and that most breast cancer cell lines displayed dose dependent viability decreases following treatment. Selective ß-blockers alone or in combination were not as effective as propranolol at reducing breast cancer cell proliferation. Molecular analysis revealed that propranolol treatment of the SK-BR-3 breast cancer line, which showed high sensitivity to beta blockade, led to a reduction in Ki67 protein expression, decreased phosphorylation of the mitogenic signaling regulators p44/42 MAPK, p38 MAPK, JNK, and CREB, increased phosphorylation of the cell survival/apoptosis regulators AKT, p53, and GSK3ß. In conclusion, use of non-selective ß-blockers in patients with early stage breast cancer may lead to decreased tumor proliferation.

Antagonistas Adrenérgicos beta/uso terapêutico , Neoplasias da Mama/tratamento farmacológico , Proliferação de Células/efeitos dos fármacos , Propranolol/uso terapêutico , Adulto , Idoso , Proteínas Reguladoras de Apoptose/metabolismo , Neoplasias da Mama/metabolismo , Neoplasias da Mama/patologia , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Estudos Transversais , Proteína de Ligação ao Elemento de Resposta ao AMP Cíclico/metabolismo , Relação Dose-Resposta a Droga , Feminino , Humanos , Antígeno Ki-67/metabolismo , Pessoa de Meia-Idade , Proteínas Quinases Ativadas por Mitógeno/metabolismo , Estadiamento de Neoplasias , Fosforilação , Receptores Adrenérgicos beta 1/efeitos dos fármacos , Receptores Adrenérgicos beta 1/metabolismo , Receptores Adrenérgicos beta 3/efeitos dos fármacos , Receptores Adrenérgicos beta 3/metabolismo , Estudos Retrospectivos , Transdução de Sinais/efeitos dos fármacos , Fatores de Tempo , Resultado do Tratamento
Case Rep Neurol ; 8(2): 102-7, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27403130


Neuromyelitis optica (NMO) is a rare disease, common in white females and rarely reported in Hispanic males. It is usually associated with recurrent demyelinating spectrum that is autoimmune in nature. The diagnosis is usually confirmed by antibody biomarkers; however, they can be negative and lead to more dilemma in diagnosis. Furthermore, the course of disease and prognosis are different in seronegative as compared to seropositive NMO. Treatment is similar in both subgroups with new approaches under investigation for seronegative NMO patients. We present an interesting case of a 37-year-old Hispanic male who presented with sudden onset of lower extremity weakness, numbness, blurry vision, and urinary retention. Magnetic resonance imaging (MRI) of the thoracic spine showed multiphasic demyelinating process involving the thoracic spinal cord. His brain MRI also revealed changes suggesting optic neuritis. The patient met the criteria for diagnosis of NMO by having optic neuritis and myelitis by imaging studies despite having negative aquaporin-4 antibodies (AQP4-Ab). His condition improved after plasma exchange. NMO can be difficult to distinguish from acute multiple sclerosis in the early stages of the disease. Having AQP4-Ab testing is important for diagnosis with imaging studies; however, negative antibody results cannot exclude the diagnosis, but rather group it in seronegative subtype. Ongoing studies and research suggest that seronegative NMO might have a different pathophysiology, manifestation, and prognosis.

Proc (Bayl Univ Med Cent) ; 29(3): 306-8, 2016 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-27365880


Multiple myeloma is a clonal hematopoietic neoplasm characterized by the proliferation of malignant plasma cells and associated end-organ damage, most notably lytic lesions in the bones. Osteosclerotic myeloma is an unusual variant of the disease in which the skeletal involvement is characterized by sclerotic lesions instead of classical lytic lesions. The disease can be associated with paraneoplastic symptoms, which have been given the acronym POEMS syndrome (polyneuropathy, organomegaly, endocrinopathy, M protein, skin changes). In addition to clonal plasma cell dyscrasias, some cases of POEMS syndrome are associated with Castleman's disease, and in 11% to 30% of the cases both Castleman's disease and clonal plasma cell proliferation are present. POEMS syndrome has rarely been described in patients with non-Hodgkin's lymphoma.