Kwee J.K.,Instituto Nacional Of Cancer
Anti-Cancer Agents in Medicinal Chemistry | Year: 2016
The ability to accumulate polyphenols with light absorbance allowed early land plants to resist UV irradiation and made survival on land possible. Largely consumed, polyphenols are not synthesized by human being. Present only in plants and some microorganisms, the number of described phenolic compounds (over 8000), is increasing due to the continual evolution of new genes and mutations in response to the adaptation to environmental changes. A wide range of biological studies revealed the antioxidant properties of polyphenols towards human pathologies such as cancer. The health benefits of polyphenols, however, depend on their amount ingested and on their bioavailability. Many factors have great influence on bioavailability of polyphenols such as the climate, agricultural practices, industrial processes and the host microbiota considered to act as a metabolic organ with an important role in human metabolism. The polyphenols anticancer effect relies on their chemical structure, concentration and on the type of cancer. The biological activity of polyphenols has been extensively studied in preclinical assays. Some polyphenols can overcome cancer chemotherapeutic resistance by modulating cancer cells with multiple drug resistance (MDR) overexpression phenotype. In solid tumours and hematological malignances, polyphenols, exert an important role in apoptosis induction, cell growth inhibition, cell cycle arrest, oxidative stress, and in cell migration and differentiation. The combination of flavonoids and chemotherapy seems to be an interesting approach for cancer treatment. In addition, some points related to the polyphenols bioavailability and delivery needs to be elucidated in order to improve their biological effects in vivo. © 2016 Bentham Science Publishers.
Calixto-Lima L.,Instituto Nacional Of Cancer
Nutrición hospitalaria : organo oficial de la Sociedad Española de Nutrición Parenteral y Enteral | Year: 2012
Antineoplastic chemotherapy (CT) represents the systemic treatment of malignant tumors. It can be used alone or combined with surgery and / or radiotherapy. The cytotoxic agents used in chemotherapy work on both cancerous cells and noncancerous cells of the body, generally resulting in high toxicity. The biological aggressiveness of chemotherapy particularly affects rapidly replicating cells, such as those of the digestive tract, resulting in adverse effects that impair food intake, leading to compromised nutritional status and which may lead to cachexia. The main toxic effects of chemotherapy in the gastrointestinal tract include nausea, vomiting -these are the most frequent- constipation, diarrhea, xerostomia, mucositis, dysphagia and anorexia. Given the high frequency of such effects, nutritional intervention should be an integral part of cancer treatment, to maintain and/or improve the patient's nutritional status and reduce or minimize the side effects caused by treatment. Accordingly, the goal of this study is to review dietetic conduct in the process of caring for patients undergoing cancer chemotherapy.
Suarez-Kurtz G.,Instituto Nacional Of Cancer
Frontiers in Pharmacology | Year: 2010
Brazil is the fifth largest country in the world and its present population, in excess of 190 million, is highly heterogeneous, as a result of centuries of admixture between Amerindians, Europeans, and Sub-Saharan Africans. The estimated individual proportions of biogeographical ancestry vary widely and continuously among Brazilians: most individuals, irrespective of self-identification as White, Brown or Black - the major categories of the Brazilian Census "race/color" system - have significant degrees of European and African ancestry, while a sizeable number display also Amerindian ancestry. These features have important pharmacogenetic (PGx) implications: first, extrapolation of PGx data from relatively well-defined ethnic groups is clearly not applicable to the majority of Brazilians; second, the frequency distribution of polymorphisms in pharmacogenes (e.g., CYP3A5, CYP2C9, GSTM1, ABCB1, GSTM3, VKORC, etc) varies continuously among Brazilians and is not captured by race/color self-identification; third, the intrinsic heterogeneity of the Brazilian population must be acknowledged in the design and interpretation of PGx studies in order to avoid spurious conclusions based on improper matching of study cohorts. The peculiarities of PGx in Brazilians are illustrated with data for different therapeutic groups, such as anticoagulants, HIV protease inhibitors and non-steroidal antinflammatory drugs, and the challenges and advantages created by population admixture for the study and implementation of PGx are discussed. PGx data for Amerindian groups and Brazilian-born, first-generation Japanese are presented to illustrate the rich diversity of the Brazilian population. Finally, I introduce the reader to the Brazilian Pharmacogenetic Network or Refargen1, a nation-wide consortium of research groups, with the mission to provide leadership in PGx research and education in Brazil, with a population health impact. © 2010 Suarez-Kurtz.
Suarez-Kurtz G.,Instituto Nacional Of Cancer
Pharmacogenomics | Year: 2012
There are nearly 600 million people living in 24 Latin American countries, speaking two major languages (Portuguese and Spanish) and sharing ancestral roots in America, Europe and Africa. Ethnic and cultural diversity, socioeconomical, scientific and technological disparities across Latin America must be taken into account in the design, interpretation and implications of pharmacogenomic studies in this region. The conference covered some of these aspects, but also took on a more global approach on the growing contribution of genomic information and biotechnological tools to the way medicines are developed, regulated and prescribed to patients. Translation of pharmacogenomics into clinical practice was the topic of a keynote lecture and two debate sessions. A preconference Introductory Course of Pharmacogenomics was offered. © 2012 Future Medicine Ltd.
Bines J.,Instituto Nacional Of Cancer |
Earl H.,University of Cambridge |
Buzaid A.C.,Centro Oncologico Antonio Ermirio Of Moraes |
Saad E.D.,University of Sao Paulo
Annals of Oncology | Year: 2014
Background: In early breast cancer, adjuvant chemotherapy decreases the risks of recurrence and breast cancer mortality, and neoadjuvant treatment leads to equivalent long-term outcomes. A large number of clinical trials have attempted to refine systemic therapeutic strategies in early breast cancer, but little attention has been paid to the sequence of anthracyclines and taxanes. Based on preclinical observations, there is limited rationale to administer the taxane before the anthracycline. Methods: We searched PubMed, the American Society of Clinical Oncology website, and clinicaltrials.gov with the goal of identifying published or ongoing studies that aimed at comparing reverse sequences of anthracyclines and taxanes. Given the nature and the small number of studies identified, we did not attempt to quantitatively pool the study results. Results: We retrieved seven studies in the adjuvant setting and eight in the neoadjuvant setting: 10 randomized trials (only 2 were phase IIII), 3 retrospective studies, and 2 ongoing phase II trials. A total of nearly 5000 patients were included in such studies. None of the clinical trials has shown disadvantages in terms of efficacy or toxicity for sequences in which the taxane was administered first. In the neoadjuvant setting, studies have collectively shown similar or increased pathological complete response rates for sequences in which the taxane was administered first. Conclusion: Given the available information, there seems to be sufficient evidence to suggest that a taxane followed by an anthracycline is a sequence option that can be incorporated into daily clinical practice. © The Author 2014. Published by Oxford University Press on behalf of the European Society for Medical Oncology. All rights reserved.