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Barretos, Brazil

Lorenzi A.T.,Molecular Oncology Center | Fregnani J.H.T.G.,Center for the Researcher Support | Possati-Resende J.C.,Barretos Cancer Hospital | Neto C.S.,Barretos Cancer Hospital | And 6 more authors.
Gynecologic Oncology | Year: 2013

Objective. Cervical cancer is the second most common cancer among Brazilian women. High-risk human papillomavirus (hr-HPV) persistence is the primary cause of cervical neoplasia. Early detection of hr-HPV is important for identifying women at risk for developing cervical lesions. Approximately 85% of new cases of cervical cancer worldwide and 50% of the total cervical cancer deaths occurred in developing countries. Here, a newmethodology to support a cervical cancer screening program was evaluated in women from various Brazilian regions. Methods. Two thousand women aged 18-77 years were enrolled in an opportunistic cervical cancer screening programandwere randomized into self-vaginal or health professional-guided cervical sampling groups. The Qiagen careHPV™testwas performed on all samples. Pap testswere performed on all women using liquid-based cytology. Results. Positive hr-HPV resultswere obtained in 12.3% (245/2000) ofwomen; similar rateswere observed in self- or health professional-collected samples. Eighty-nine percent (1719/2000) of cervical cytologies classified as normal were negative to hr-HPV. Among the cytological samples, 36.6% classified as ASC-US+ were positive to hr-HPV, 78.8% were LSIL and 75.0% were HSIL. Conclusions. Self-sampled and health professional-sampled vaginal/cervical specimens did not differ in their rates of detection of hr-HPV. Therefore, HPV DNA testing in self-sampled vaginal cells is an alternative to primary screening in low-resource settings. © 2013 Elsevier Inc. All rights reserved. Source


Canberk S.,Haydarpasa Numune Education and Research Hospital | Longatto-Filho A.,University of Sao Paulo | Longatto-Filho A.,University of Minho | Longatto-Filho A.,Pt Government Assoc Laboratory | And 3 more authors.
Diagnostic Cytopathology | Year: 2016

Pathologists have an important role in the diagnosis of infectious disease (ID). In many cases, a definitive diagnosis can be made using cytopathology alone. However, several ancillary techniques can be used on cytological material to reach a specific diagnosis by identifying the causative agent and consequently defining the management of the patient. This review aims to present the effectiveness of the application of molecular studies on cytological material to diagnose IDs and discuss the advantages and disadvantages of the various molecular techniques according to the type of cytological specimen and the infectious agents. Diagn. Cytopathol. 2016;44:156-164. © 2015 Wiley Periodicals, Inc. Source


Lorenzi A.T.,Molecular Oncology Center | Syrjanen K.J.,Molecular Oncology Center | Longatto-Filho A.,Barretos Cancer Hospital | Longatto-Filho A.,University of Sao Paulo | Longatto-Filho A.,University of Minho
Virology Journal | Year: 2015

This review tackles the issues related to disease burden caused by cervical cancer (CC) and its precursor (CIN) lesions in Brazil. A special focus is given to new technologies with potential to interfere with the development of CC by reducing the high-risk human papillomavirus (hr-HPV)-induced lesions that remain a major public health burden in all developing countries where organized screening programs do not exist. Globally, 85 % of all incident CC and 50 % of CC deaths occur in the developing countries. Unfortunately, most regions of Brazil still demonstrate high mortality rates, ranking CC as the second most common cancer among Brazilian women. Recently, CC screening programs have been tailored in the country to enable early detection of CC precursor lesions and thereby reduce cancer mortality. A combination of HPV testing with liquid-based cytology (LBC) seems to be a promising new approach in CC screening, with high expectation to offer an adequate control of CC burden in this country. © 2015 Lorenzi et al. Source


Sales L.,Federal University of Alfenas | Pezuk J.A.,Molecular Oncology Center | Borges K.S.,University of Sao Paulo | Brassesco M.S.,University of Sao Paulo | And 5 more authors.
BMC Complementary and Alternative Medicine | Year: 2015

Background: Glioblastoma is the most common tumor of the central nervous system and one of the hardest tumors to treat. Consequently, the search for novel therapeutic options is imperative. 7-epiclusianone, a tetraprenylated benzophenone isolated from the epicarp of the native plant Garcinia brasiliensis, exhibits a range of biological activities but its prospect anticancer activity is underexplored. Thus, the aim of the present study was to evaluate the influence of 7-epiclusianone on proliferation, clonogenic capacity, cell cycle progression and induction of apoptosis in two glioblastoma cell lines (U251MG and U138MG). Methods: Cell viability was measured by the MTS assay; for the clonogenic assay, colonies were stained with Giemsa and counted by direct visual inspection; For cell cycle analysis, cells were stained with propidium iodide and analyzed by cytometry; Cyclin A expression was determined by immunoblotting; Apoptotic cell death was determined by annexin V fluorescein isothiocyanate labeling and Caspase-3 activity in living cells. Results: Viability of both cell lines was drastically inhibited; moreover, the colony formation capacity was significantly reduced, demonstrating long-term effects even after removal of the drug. 7-epiclusianone treatment at low concentrations also altered cell cycle progression, decreased the S and G2/M populations and at higher concentrations increased the number of cells at sub-G1, in concordance with the increase of apoptotic cells. Conclusion: The present study demonstrates for the first time the anticancer potential of 7-epiclusianone against glioblastoma cells, thus meriting its further investigation as a potential therapeutic agent. © 2015 Sales et al. Source


dos Santos Francisco R.,University of Sao Paulo | dos Santos Francisco R.,University of Geneva | Buhler S.,University of Geneva | Nunes J.M.,University of Geneva | And 7 more authors.
Immunogenetics | Year: 2015

Supertypes are groups of human leukocyte antigen (HLA) alleles which bind overlapping sets of peptides due to sharing specific residues at the anchor positions—the B and F pockets—of the peptide-binding region (PBR). HLA alleles within the same supertype are expected to be functionally similar, while those from different supertypes are expected to be functionally distinct, presenting different sets of peptides. In this study, we applied the supertype classification to the HLA-A and HLA-B data of 55 worldwide populations in order to investigate the effect of natural selection on supertype rather than allelic variation at these loci. We compared the nucleotide diversity of the B and F pockets with that of the other PBR regions through a resampling procedure and compared the patterns of within-population heterozygosity (He) and between-population differentiation (GST) observed when using the supertype definition to those estimated when using randomized groups of alleles. At HLA-A, low levels of variation are observed at B and F pockets and randomized He and GST do not differ from the observed data. By contrast, HLA-B concentrates most of the differences between supertypes, the B pocket showing a particularly high level of variation. Moreover, at HLA-B, the reassignment of alleles into random groups does not reproduce the patterns of population differentiation observed with supertypes. We thus conclude that differently from HLA-A, for which supertype and allelic variation show similar patterns of nucleotide diversity within and between populations, HLA-B has likely evolved through specific adaptations of its B pocket to local pathogens. © 2015, The Author(s). Source

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