The Search for Cancer Biomarkers: Assessing the Distribution of INDEL Markers in Different Genetic Ancestries.

Cancer is a multifactorial group of diseases, being highly incident and one of the leading causes of death worldwide. In Brazil, there is a great variation in cancer incidence and impact among the different geographic regions, partly due to the genetic heterogeneity of the population in this country, composed mainly by European (EUR), Native American (NAM), African (AFR), and Asian (ASN) ancestries. Among different populations, genetic markers commonly present diverse allelic frequencies, but in admixed populations, such as the Brazilian population, data is still limited, which is an issue that might influence cancer incidence. Therefore, we analyzed the allelic and genotypic distribution of 12 INDEL polymorphisms of interest in populations from the five Brazilian geographic regions and in populations representing EUR, NAM, AFR, and ASN, as well as tissue expression in silico. Genotypes were obtained by multiplex PCR and the statistical analyses were done using R, while data of tissue expression for each marker was extracted from GTEx portal. We highlight that all analyzed markers presented statistical differences in at least one of the population comparisons, and that we found 39 tissues to be differentially expressed depending on the genotype. Here, we point out the differences in genotype distribution and gene expression of potential biomarkers for risk of cancer development and we reinforce the importance of this type of study in populations with different genetic backgrounds.

New insights on intercontinental origins of paternal lineages in Northeast Brazil.

BACKGROUND: The current Brazilian population is the product of centuries of admixture between intercontinental founding groups. Although previous results have revealed a heterogeneous distribution of mitochondrial lineages in the Northeast region, the most targeted by foreign settlers during the sixteenth century, little is known about the paternal ancestry of this particular population. Considering historical records have documented a series of territorial invasions in the Northeast by various European populations, we aimed to characterize the male lineages found in Brazilian individuals in order to discover to what extent these migrations have influenced the present-day gene pool. Our approach consisted of employing four hierarchical multiplex assays for the investigation of 45 unique event polymorphisms in the non-recombining portion of the Y-chromosome of 280 unrelated men from several Northeast Brazilian states. RESULTS: Primary multiplex results allowed the identification of six major haplogroups, four of which were screened for downstream SNPs and enabled the observation of 19 additional lineages. Results reveal a majority of Western European haplogroups, among which R1b-S116* was the most common (63.9%), corroborating historical records of colonizations by Iberian populations. Nonetheless, FST genetic distances show similarities between Northeast Brazil and several other European populations, indicating multiple origins of settlers. Regarding Native American ancestry, our findings confirm a strong sexual bias against such haplogroups, which represented only 2.5% of individuals, highly contrasting previous results for maternal lineages. Furthermore, we document the presence of several Middle Eastern and African haplogroups, supporting a complex historical formation of this population and highlighting its uniqueness among other Brazilian regions. CONCLUSIONS: We performed a comprehensive analysis of the major Y-chromosome lineages that form the most dynamic migratory region from the Brazilian colonial period. This evidence suggests that the ongoing entry of European, Middle Eastern, and African males in the Brazilian Northeast, since at least 500 years, was significantly responsible for the present-day genetic architecture of this population.

Estimating Asian Contribution to the Brazilian Population: A New Application of a Validated Set of 61 Ancestry Informative Markers.

Estimates of different ancestral proportions in admixed populations are very important in population genetics studies, especially for the detection of population substructure effects in studies of case-control associations. Brazil is one of the most heterogeneous countries in the world, both from a socio-cultural and a genetic point of view. In this work, we investigated a previously developed set of 61 ancestry informative markers (AIM), aiming to estimate the proportions of four different ancestral groups (African, European, Native American and Asian) in Brazilian populations. To the best of our knowledge, this is the first study to use a set of AIM to investigate the genetic contribution of all four main parental populations to the Brazilian population, including Asian contribution. All selected markers were genotyped through multiplex PCR and capillary electrophoresis. The set was able to successfully differentiate the four ancestral populations (represented by 939 individuals) and identify their genetic contributions to the Brazilian population. In addition, it was used to estimate individual interethnic admixture of 1050 individuals from the Southeast region of Brazil and it showed that these individuals present a higher European ancestry contribution, followed by African, Asian and Native American ancestry contributions. Therefore, the 61 AIM set has proved to be a valuable tool to estimate individual and global ancestry proportions in populations mainly formed by these four groups. Our findings highlight the importance of using sets of AIM to evaluate population substructure in studies carried in admixed populations, in order to avoid misinterpretation of results.

Genetic Susceptibility to Neurodegeneration in Amazon: Apolipoprotein E Genotyping in Vulnerable Populations Exposed to Mercury.

Human exposure to mercury is a serious problem of public health in Amazon. As in other vulnerable populations throughout the world, Amazonian riverine populations are chronically exposed to this metal and some symptoms of mercury intoxication were already detected in these populations. However, studies on the genetic susceptibility to mercury toxicity in the Amazon are scarce, and they tested a limited number of individuals. In this context, apolipoprotein E gene (APOE) is a key element with a well-established association among their alleles and the neurodegenerative consequences of mercury intoxication. However, no studies have addressed APOE genotyping in Amazonian exposed populations. Additionally, epidemiological studies with APOE genotyping in Amazon have been restricted to indigenous populations. Therefore, this work analyzed for the first time the genotypic and allelic profiles of APOE in Amazonian riverine populations chronically exposed to mercury. Eight hundred and twenty three individuals were enrolled in our study donating blood (794) and/or hair (757). APOE genotyping was analyzed by real-time PCR. Total mercury and mercury species were quantified by ICP-MS and GC-pyro-AFS, respectively. Genomic ancestry markers were evaluated by multiplex-PCR reaction, separated by capillary electrophoresis on the ABI 3130 Genetic Analyzer instrument and analyzed on GeneMapper ID v3.2. The 𝜀3 and 𝜀3/𝜀3 were the most frequent allele and genotype, respectively, followed by 𝜀4 allele and 𝜀3/𝜀4 genotype. Only 𝜀2/𝜀2 genotype was not found, suggesting that the absence of this genotype is a generalized phenomenon in Amazon. Also, our data supported an association between the presence of APOE4 and the Amerindian origin in these populations. Fifty-nine individuals were identified at maximum risk with levels of mercury above 10 µg/g and the presence of APOE4. Interestingly, among individuals with high mercury content, APOE4-carriers had high mercury levels than APOE2-carriers, pointing to a different heavy metal accumulation according to the APOE allele. These data suggest that APOE4, in addition to a possible pharmacodynamic effect, may influence pharmacokinetically the mercury exposure causing its higher accumulation and leading to worse deleterious consequences. Our results may aid in the development of prevention strategies and health policy decision-making regarding these at-risk vulnerable populations.

mtDNA structure: the women who formed the Brazilian Northeast.

BACKGROUND: The distribution of mitochondrial DNA (mtDNA) lineages in Brazil is heterogeneous due to different regional colonization dynamics. Northeastern Brazil, although being an important region in terms of human imigration and ethnic admixture, has little information regarding its population mtDNA composition. Here, we determine which mitochondrial lineages contributed to the formation of the Northeastern Brazilian population. Our sample consisted of 767 individuals distributed as follows i) 550 individuals from eight Northeastern states (Piauí, Ceará, Rio Grande do Norte, Paraíba, Pernambuco, Alagoas, Sergipe, and Bahia) which were sequenced for mtDNA hypervariable segments I, II, and III; ii) 217 individuals from Alagoas and Pernambuco (previously published data). Data analysis was performed through sequence alignment and Haplogrep 2.0 haplogroup assignment tools. Furthermore, maternal ancestry distribution was contextualized and, when possible, related to historical events to better understand the biological interactions and population dynamics that occurred in this region since the beginning of colonization. RESULTS: Unexpectedly, Amerindian mitochondrial ancestry was the highest in the Northeastern region overall, followed by African, European and non-Amerindian Asian, unlike previous results for this region. Alagoas and Pernambuco states, however, showed a larger African mtDNA frequency. The Northeastern region showed an intraregional heterogeneous distribution regarding ancestral groups, in which states/mesoregions located to the north had a prevalent Amerindian ancestral frequency and those to the south had predominance of African ancestry. Moreover, results showed great diversity of European haplogroups and the presence of non-Amerindian Asian haplogroups. CONCLUSIONS: Our findings are in disagreement with previous investigations that suggest African mitochondrial ancestry is the most prevalent in the Brazilian Northeast. The predominance of Amerindian lineages exemplifies the importance of indigenous women in the formation of the population, despite intense African slave entry and conflicts with European settlers. The variable distribution of ancestral groups observed in the Northeast is in accordance with historical records showing the similarities with colonization dynamics occurred in the Amazon region and the Brazilian Southeast. Moreover, the variety of European haplogroups suggests multiple origins of founding groups, specially those found in Western European populations.

Analysis of 12 variants in the development of gastric and colorectal cancers.

AIM: To evaluate the relation between 12 polymorphisms and the development of gastric cancer (GC) and colorectal cancer (CRC). METHODS: In this study, we included 125 individuals with GC diagnosis, 66 individuals with CRC diagnosis and 475 cancer-free individuals. All participants resided in the North region of Brazil and authorized the use of their samples. The 12 polymorphisms (in CASP8, CYP2E1, CYP19A1, IL1A, IL4, MDM2, NFKB1, PAR1, TP53, TYMS, UGT1A1 and XRCC1 genes) were genotyped in a single PCR for each individual, followed by fragment analysis. To avoid misinterpretation due to population substructure, we applied a previously developed set of 61 ancestry-informative markers that can also be genotyped by multiplex PCR. The statistical analyses were performed in Structure v.2.3.4, R environment and SPSS v.20. RESULTS: After statistical analyses with the control of confounding factors, such as genetic ancestry, three markers (rs79071878 in IL4, rs3730485 in MDM2 and rs28362491 in NFKB1) were positively associated with the development of GC. One of these markers (rs28362491) and the marker in the UGT1A1 gene (rs8175347) were positively associated with the development of CRC. Therefore, we investigated whether the joint presence of the deleterious alleles of each marker could affect the development of cancer and we obtained positive results in all analyses. Carriers of the combination of alleles RP1 + DEL (rs79071878 and rs28361491, respectively) are at 10-times greater risk of developing GC than carriers of other combinations. Similarly, carriers of the combination of DEL + RARE (rs283628 and rs8175347) are at about 12-times greater risk of developing CRC than carriers of other combinations. CONCLUSION: These findings are important for the comprehension of gastric and CRC development, particularly in highly admixed populations, such as the Brazilian population.

The His131Arg substitution in the FCGR2A gene (rs1801274) is not associated with the severity of influenza A(H1N1)pdm09 infection.

BACKGROUND: The virulence and pathogenicity of different influenza strains are responsible for a more or less severe disease. Recent studies have attempted to understand how host genetic factors may influence the clinical presentation of the disease. In the present study, the His131Arg (rs1801274) polymorphism was investigated in individuals from a Brazilian admixed population with a diagnosis of influenza A(H1N1)pdm09 infection. METHODS: In the present study, the influence of the His131Arg (rs1801274) polymorphism, a variant of the FCGR2A gene, was investigated in 436 patients with a diagnosis of influenza A(H1N1)pdm09, evaluated at health services in the northern and northeastern regions of Brazil between June 2009 and August 2010. Patients were divided into a group of non-hospitalized patients (n = 192) and a group of hospitalized patients (n = 244; 100 of them died). RESULTS: No significant difference in the allele or genotype frequencies of the rs1801274 polymorphism was observed between groups (p = 0.952 and p = 0.388). Multinomial logistic regression showed no effect of the rs1801274 polymorphism on severity or death of patients from the Brazilian admixed population (p = 0.368 and p = 0.469). CONCLUSIONS: The rs1801274 polymorphism is not associated with severe disease in patients infected with influenza A(H1N1)pdm09.

CDH1 mutations in gastric cancer patients from northern Brazil identified by Next- Generation Sequencing (NGS).

Gastric cancer is considered to be the fifth highest incident tumor worldwide and the third leading cause of cancer deaths. Developing regions report a higher number of sporadic cases, but there are only a few local studies related to hereditary cases of gastric cancer in Brazil to confirm this fact. CDH1 germline mutations have been described both in familial and sporadic cases, but there is only one recent molecular description of individuals from Brazil. In this study we performed Next Generation Sequencing (NGS) to assess CDH1 germline mutations in individuals who match the clinical criteria for Hereditary Diffuse Gastric Cancer (HDGC), or who exhibit very early diagnosis of gastric cancer. Among five probands we detected CDH1 germline mutations in two cases (40%). The mutation c.1023T > G was found in a HDGC family and the mutation c.1849G > A, which is nearly exclusive to African populations, was found in an early-onset case of gastric adenocarcinoma. The mutations described highlight the existence of gastric cancer cases caused by CDH1 germline mutations in northern Brazil, although such information is frequently ignored due to the existence of a large number of environmental factors locally. Our report represent the first CDH1 mutations in HDGC described from Brazil by an NGS platform.

Neither self-reported ethnicity nor declared family origin are reliable indicators of genomic ancestry.

Ancestry information can be useful in investigations of diseases with a genetic or infectious background. As the Brazilian population is highly admixed physical traits tend to be poor indicators of ancestry. The assessment of ancestry by ancestry informative markers (AIMs) can exclude the subjectivity of self-declared ethnicity and reported family origin. We aimed to evaluate the reliability of self-reported ethnicity or reported family origin as indicators of genomic ancestry in a female population from the Southeast of Brazil. Two cohorts were included: 404 women asked to self-report their ethnicity (Pop1) and 234 women asked to report their family's origin (Pop2). Identification of AIMs was performed using a panel of 61 markers and results were plotted against parental populations-Amerindian, Western European and Sub-Saharan African-using Structure v2.3.4. In Pop1 57.4 % of women self-reported as white, 34.6 % as brown and 8.0 % as black. Median global European, Amerindian and African contributions were 66.8, 12.6 and 16.6 %. In Pop2, 66.4 % of women declared European origin, 23.9 % African origin and 26.9 % Amerindian. Median global European, Amerindian and African contributions were 80.8, 7.3 and 7.6 %, respectively. Only 31.0 and 21.0 % of the global variation in African and European contributions, respectively, could be explained by self-reported ethnicity and reported family origin only accounted for 20.0 and 5.0 % of the variations observed in African and European ancestries, respectively. Amerindian ancestry did not influence self-reported ethnicity or declared family origin. Neither self-reported ethnicity nor declared family origin are reliable indicators of genomic ancestry in these Brazilian populations.

Ancestry informative markers and selected single nucleotide polymorphisms in immunoregulatory genes on preterm labor and preterm premature rupture of membranes: a case control study.

BACKGROUND: A genetic predisposition to Preterm Labor (PTL) and Preterm Premature Rupture of Membranes (PPROM) has been suggested; however the relevance of polymorphisms and ancestry to susceptibility to PTL and PPROM in different populations remains unclear. The aim of this study was to evaluate the contribution of maternal and fetal SNPs in the IL1B, IL6, IL6R, TNFA, TNFR, IL10, TLR2, TLR4, MMP9, TIMP1 and TIMP2 genes and the influence of ancestry background in the susceptibility to PTL or PPROM in Brazilian women. METHODS: Case-control study conducted at a tertiary hospital in São Paulo State, Brazil. We included women with PTL or PPROM and their babies (PTL: 136 women and 88 babies; PPROM: 65 women and 44 babies). Control group included 402 mother-babies pairs of term deliveries. Oral swabs were collected for identification of AIMs by fragment analysis and SNPs by Taqman® SNP Genotyping Assays and PCR. Linkage Disequilibrium and Hardy-Weinberg proportions were evaluated using Genepop 3.4. Haplotypes were inferred using the PHASE algorithm. Allele, genotype and haplotype frequencies were compared by Fisher's exact test or χ (2) and Odds Ratio. Logistic regression was performed. Clinical and sociodemographic data were analyzed by Fisher's exact test and Mann-Whitney. RESULTS: PTL was associated with European ancestry and smoking while African ancestry was protective. The fetal alleles IL10-592C (rs800872) and IL10-819C (rs1800871) were also associated with PTL and the maternal haplotype TNFA-308G-238A was protective. Maternal presence of IL10-1082G (rs1800896) and TLR2A (rs4696480) alleles increased the risk for PPROM while TNFA-238A (rs361525) was protective. Family history of PTL/PPROM was higher in cases, and time to delivery was influenced by IL1B-31T (rs1143627) and TLR4-299G (rs4986790). CONCLUSION: There is an association between European ancestry and smoking and PTL in our Brazilian population sample. The presence of maternal or fetal alleles that modify the inflammatory response increase the susceptibility to PTL and PPROM. The family history of PTL/PPROM reinforces a role for genetic polymorphisms in susceptibility to these outcomes.

Distribution of allelic and genotypic frequencies of IL1A, IL4, NFKB1 and PAR1 variants in Native American, African, European and Brazilian populations.

BACKGROUND: The inflammatory response plays a key role at different stages of cancer development. Allelic variants of the interleukin 1A (IL1A), interleukin 4 (IL4), nuclear factor kappa B1 (NFKB1) and protease-activated receptor 1 (PAR1) genes may influence not only the inflammatory response but also susceptibility to cancer development. Among major ethnic or continental groups, these polymorphic variants present different allelic frequencies. In admixed populations, such as the Brazilian population, data on distribution of these polymorphisms are limited. Here, we collected samples of cancer-free individuals from the north, northeast, midwest, south and southeast regions of Brazil and from the three main groups that gave rise to the Brazilian population: Native Americans from the Brazilian Amazon, Africans and Europeans. We describe the allelic distributions of four IL1A (rs3783553), IL4 (rs79071878), NFKB1 (rs28362491) and PAR1 (rs11267092) gene polymorphisms, which the literature describes as polymorphisms with a risk of cancer or worse prognosis for cancer. RESULTS: The genotypic distribution of the four polymorphisms was statistically distinct between Native Americans, Africans and Europeans. For the allelic frequency of these polymorphisms, the Native American population was the most distinct among the three parental populations, and it included the greatest number of alleles with a risk of cancer or worse prognosis for cancer. The PAR1 gene polymorphism allelic distribution was similar among all Brazilian regions. For the other three markers, the northern region population was statistically distinct from other Brazilian region populations. CONCLUSION: The IL1A, IL4, NFKB1 and PAR1 gene polymorphism allelic distributions are homogeneous among the regional Brazilian populations, except for the northern region, which significantly differs from the other four Brazilian regions. Among the parental populations, the Native American population exhibited a higher incidence of alleles with risk of cancer or worse prognosis for cancer, which can indicate greater susceptibility to this disease. These genetic data may be useful for future studies on the association between these polymorphisms and cancer in the investigated populations.

Impact of population admixture on the distribution of immune response co-stimulatory genes polymorphisms in a Brazilian population.

Co-stimulatory molecules are essential in the orchestration of immune response and polymorphisms in their genes are associated with various diseases. However, in the case of variable allele frequencies among continental populations, this variation can lead to biases in genetic studies conducted in admixed populations such as those from Brazil. The aim of this study was to evaluate the influence of genomic ancestry on distributions of co-stimulatory genes polymorphisms in an admixed Brazilian population. A total of 273 individuals from the north of Brazil participated in this study. Nine single nucleotide polymorphisms in 7 genes (CD28, CTLA4, ICOS, CD86, CD40, CD40L and BLYS) were determined by polymerase chain reaction-restriction fragment length polymorphism. We also investigated 48 insertion/deletion ancestry markers to characterize individual African, European and Amerindian ancestry proportions in the samples. The analysis showed that the main contribution was European (43.9%) but also a significant contribution of African (31.6%) and Amerindian (24.5%) ancestry. ICOS, CD40L and CD86 polymorphisms were associated with genomic ancestry. However there were no significant differences in the proportions of ancestry for the other SNPs and haplotypes studied. Our findings reinforce the need to apply AIMs in genetic association studies involving these polymorphisms in the Brazilian population.

Amerindian genetic ancestry and INDEL polymorphisms associated with susceptibility of childhood B-cell Leukemia in an admixed population from the Brazilian Amazon.

Acute lymphoblastic leukemia (ALL) is a malignant tumor common in children. Studies of genetic susceptibility to cancer using biallelic insertion/deletion (INDEL) type polymorphisms associated with cancer development pathways may help to clarify etymology of ALL. In this study, we investigate the role of eight functional INDEL polymorphisms and influence of genetic ancestry to B-cell ALL susceptibility in children of Brazilian Amazon population, which has a high degree of inter-ethnic admixture. Ancestry analysis was estimated using a panel of 48 autosomal ancestry informative markers. 130 B-cell ALL patients and 125 healthy controls were included in this study. The odds ratios and 95% confidence intervals were adjusted for confounders. The results indicated an association between the investigated INDEL polymorphisms in CASP8 (rs3834129), CYP19A1 (rs11575899) e XRCC1 (rs3213239) genes in the development of B-cell ALL. The carriers of Insertion/Insertion (Ins/Ins) genotype of the polymorphism in CASP8 gene presented reduced chances of developing B-cell ALL (P=0.001; OR=0.353; 95% CI=0.192-0.651). The Deletion/Deletion (Del/Del) genotype of the polymorphism in CYP19A1 gene was associated to a lower chance of developing B-cell ALL (P=3.35×10-6; OR=0.121; 95% CI=0.050-0.295), while Del/Del genotype of the polymorphism in XRCC1 gene was associated to a higher chance of developing B-cell ALL (P=2.01×10-4; OR=6.559; 95% CI=2.433-17.681). We also found that Amerindian ancestry correlates with the risk of B-cell ALL. For each increase of 10% in the Amerindian ancestry results in 1.4-fold chances of developing B-cell ALL (OR=1.406; 95% IC=1.123-1.761), while each increase of 10% in the European ancestry presents a protection effect in the development of B-cell ALL (OR=0.666; 95% IC=0.536-0.827). The results suggest that genetic factors influence leukemogenesis and might be explored in the stratification of B-cell ALL risk in admixed populations.

Caracterización epidemiológica de pacientes con cirrosis en una consulta de gastroenterologia en Pereira, Colombia, 2009-2012 / Epidemiologic characterization of the patients with cirrhosis treated in an outpatient clinic of gastroenterology in Pereira, Colombia, 2009-2012

Este estudio soporta sus bases en la necesidad de obtener datos claros que correspondan a la realidad de la población de la zona centro occidental de nuestro país, con el fin de aclarar el panorama con respecto a la cirrosis, condición asociada a múltiples factores que influyen, tanto en su origen y evolución, como en su pronóstico. Para ello realizamos un estudio descriptivo de cien pacientes con diagnóstico de cirrosis que consultaron al servicio de gastroenterología durante el período comprendido entre enero de 2009 hasta julio de 2012. Para un mejor análisis, el estudio se desarrolló conformando categorías epidemiológicas, etiológicas, de descompensación, de pronóstico y de muerte. La información se recolectó directamente de las historias clínicas de los pacientes y se completó con entrevistas, diligenciando un instrumento en el cual se reunían las variables necesarias para el análisis. A los pacientes que carecían de algunos datos imagenológicos se les realizaron estudios de extensión como ecografía hepática y doppler portal. Luego de la recolección de los datos, se realizó una descripción detallada de las variables propuestas encontrando algunas con mayor significancia estadística, las cuales se llevaron a análisis bivariado y multivariado. Se encontró una gran diversidad en esta población; la mayoría de los pacientes procedían de áreas urbanas; la relación de género fue 1:1. El alcohol fue el principal factor etiológico para el desarrollo de esta patología, lo cual concuerda con otros países Latinoamericanos. La causa autoinmune viene en incremento, acá ocupó un segundo puesto, seguida de la etiología viral.

The following research supports its bases in the necessity of dependable epidemiological data corresponding to population reality in the western center region of our country, in order to clarify the public health outlook for cirrhosis, understanding it as an associated condition with multiple influencing factors, both in its origin and its development, as well as in its prognosis. For this research we carry out a descriptive study with one hundred patients diagnosed with cirrhosis who consulted for a gastroenterology service in a period from January 2009 to July 2012. For a better analysis, the research was developed by creating the following categories: Epidemiological, etiological, by decompensation, by prognosis, and by death. The information was directly gathered from patient’s medical records and completed with interviews, in that way we earn an instrument which gathered the needed variables for analysis. Extension studies like hepatic ultrasound and portal Doppler were realized to patients without some imagenological information. After data garner, a detailed description of previously variables was performed, finding some of them with higher statistical significance, which were analyzed by a bivariate and multivariate system. A great variety was found in this population; most of patients came from urban areas; the relation in gender was 1:1. Consumption of alcohol was the main etiological factor to develop this pathology. Previous information matched with described data from other Latin-American countries. Autoimmune cause should be taken into account because is increasing and occupied a second place in the research, followed by infectious viral etiology.

Estrategia para la preparación de unidades de salud en buenas prácticas clínicas / Strategy for the preparation of health units for good clinical practices

Introducción: El entorno regulatorio mundial es cada vez más exigente para establecer, implementar y mantener el cumplimiento de las buenas prácticas clínicas (BPC). En Cuba, una respuesta necesaria derivada del desarrollo creciente de la industria farmacéutica y biotecnológica nacional fue la creación del Centro Nacional Coordinador de Ensayos Clínicos (CENCEC). Una de las misiones del CENCEC es preparar a las unidades-sitios clínicos seleccionados que realizan investigaciones clínicas, para su posterior certificación en BPC por la autoridad reguladora nacional, con la finalidad de avalar la calidad que corresponde al proceso de investigación clínica que redunda en una esmerada atención y protección al paciente objeto de estudio. Objetivo: Describir la estrategia del CENCEC para la preparación en BPC de los sitios clínicos seleccionados del Sistema Nacional de Salud (SNS) que participan en ensayos clínicos. Métodos: Se revisan más de 250 documentos normativos emitidos por Europa, Estados Unidos, Japón y los países nórdicos relacionados con aspectos prácticos y éticos para la implementación de las BPC. Se elabora una estrategia para la preparación de los sitios clínicos en BPC concebida en 4 etapas: 1) concepción técnica del proceso y organización documental, 2) selección de los sitios clínicos, 3) diagnóstico y evaluación pre-intervención y 4) preparación para la certificación. Resultados: Se identificaron 80 sitios clínicos que realizan ensayos clínicos en Cuba, de los cuales se seleccionaron 11 para la aplicación de la estrategia. Se elaboró un manual de preparación de los sitios en BPC con los aspectos de mayor impacto en el cumplimiento de las BPC. Se realizaron 40 visitas a los sitios clínicos seleccionados, 12 diagnósticas, 24 de seguimiento, una de inclusión de nuevos sitios, y 3 de declaración de Listo para Certificación...(AU)

Background: The global regulatory environment is increasingly demanding to establish, implement, and maintain the compliance with Good Clinical Practices (GCP). In Cuba, The National Coordinating Center for Clinical Trials (CENCEC) was created as a necessary response derived from the increasing development of the national pharmaceutical and biotechnological industry. One of the missions of the CENCEC is to prepare selected clinical units/sites that conduct clinical research for a further certification in GCP by the national regulatory authority in order to guarantee the quality that corresponds to the process of clinical research, resulting in a careful attention and protection of the patient under study. Objective: To describe the strategy of the CENCEC for the preparation of good clinical practices in the selected clinical sites of the National Health System (SNS) that participate in clinical trials. Methods: More than 250 regulatory documents issued by Europe, the United States, Japan and the Nordic countries, related to ethical and practical aspects for the implementation of good clinical practices, were reviewed. A strategy for the preparation of clinical sites in GCP was conceived in 4 stages: 1) technical design of the process and document organization, 2) selection of the clinical sites, 3) diagnosis and pre-intervention evaluation, and 4) preparation for certification. Results: 80 clinical sites that conduct clinical trials in Cuba were identified, of which 11 were selected for the implementation of the strategy. A manual for the preparation of the sites in GCP with aspects of great impact in compliance with GCP was created. 40 visits were made to the selected clinical sites, 12 of them were diagnostic, 24 were follow-up visits, 1 was made for the inclusion of new sites, and 3 for the statement Ready for Certification...(AU)

Estrategia para la preparación de unidades de salud en buenas prácticas clínicas / Strategy for the preparation of health units for good clinical practices

Introducción: El entorno regulatorio mundial es cada vez más exigente para establecer, implementar y mantener el cumplimiento de las buenas prácticas clínicas (BPC). En Cuba, una respuesta necesaria derivada del desarrollo creciente de la industria farmacéutica y biotecnológica nacional fue la creación del Centro Nacional Coordinador de Ensayos Clínicos (CENCEC). Una de las misiones del CENCEC es preparar a las unidades-sitios clínicos seleccionados que realizan investigaciones clínicas, para su posterior certificación en BPC por la autoridad reguladora nacional, con la finalidad de avalar la calidad que corresponde al proceso de investigación clínica que redunda en una esmerada atención y protección al paciente objeto de estudio. Objetivo: Describir la estrategia del CENCEC para la preparación en BPC de los sitios clínicos seleccionados del Sistema Nacional de Salud (SNS) que participan en ensayos clínicos. Métodos: Se revisan más de 250 documentos normativos emitidos por Europa, Estados Unidos, Japón y los países nórdicos relacionados con aspectos prácticos y éticos para la implementación de las BPC...

Background: The global regulatory environment is increasingly demanding to establish, implement, and maintain the compliance with Good Clinical Practices (GCP). In Cuba, The National Coordinating Center for Clinical Trials (CENCEC) was created as a necessary response derived from the increasing development of the national pharmaceutical and biotechnological industry. One of the missions of the CENCEC is to prepare selected clinical units/sites that conduct clinical research for a further certification in GCP by the national regulatory authority in order to guarantee the quality that corresponds to the process of clinical research, resulting in a careful attention and protection of the patient under study. Objective: To describe the strategy of the CENCEC for the preparation of good clinical practices in the selected clinical sites of the National Health System (SNS) that participate in clinical trials. Methods: More than 250 regulatory documents issued by Europe, the United States, Japan and the Nordic countries, related to ethical and practical aspects for the implementation of good clinical practices, were reviewed...

Evaluación de productos farmacéuticos, biotecnológicos y equipos médicos: algunos aspectos de interés / Evaluation of pharmaceuticals, biotechnological products and medical equipment: some aspects of interest

Se pone en conocimiento de los profesionales de la salud el proceso mediante el cual llegan al mercado los medicamentos y equipos médicos que utilizan diariamente en la práctica médica . Se explican brevemente las etapas por las que atraviesan estos hasta alcanzar el registro sanitario. Se exponen las tendencias actuales referentes a dicho proceso(AU)

Evaluación de productos farmacéuticos, biotecnológicos y equipos médicos: algunos aspectos de interés / Evaluation of pharmaceuticals, biotechnological products and medical equipment: some aspects of interest

Se pone en conocimiento de los profesionales de la salud el proceso mediante el cual llegan al mercado los medicamentos y equipos médicos que utilizan diariamente en la práctica médica . Se explican brevemente las etapas por las que atraviesan estos hasta alcanzar el registro sanitario. Se exponen las tendencias actuales referentes a dicho proceso