Maternal diet in pregnancy and acute leukemia in infants: a case-control study in Mexico City.

Introduction: Epidemiological studies around the world on acute leukemia (AL) and risk factors in infants are scarce. Infant AL has been proposed to originate in utero, which facilitates its study by establishing a short exposure time in pregnant women to environmental and dietary factors that could contribute to the risk of or protection against leukemia. We hypothesized that maternal diet during pregnancy may be an important factor involved in AL in offspring. Methods: We conducted a hospital-based case-control study from 2010 to 2019 on maternal diet during pregnancy in nine high-specialty public hospitals of different health institutions that diagnose and offer treatment to children with AL in Mexico City. Cases (n=109) were children ≤24 months of age with de novo diagnosis of AL, and controls (n=252) were children obtained in hospitals from second-level medical care matched for age, sex, and health institution. Maternal diet during pregnancy was obtained by a semiquantitative food frequency questionnaire. Unconditional logistic regression models were used to assess the association between food groups and infant AL. Potential confounders were assessed by constructing directed acyclic graphs (DAGs) with Dagitty software in which adjusted options were identified for the construction of unconditional logistic regression models. Results: Cases were slightly predominantly female (52.3%). The years of education of the mother in cases and controls was 0-9 on average, and those who reported smoking cigarettes and consuming alcohol during pregnancy did so at a low frequency. Regarding the mother's diet, the main findings were that the consumption of allium vegetables during pregnancy was inversely associated with AL for medium and high consumption (OR=0.26, 95% CI 0.14-0.46; P-trend< 0.001). In contrast, the high consumption of high-fat dairy products had a positive association with AL (OR=2.37, 95% CI 1.30-4.34; P-trend<0.001). No association was found between consumption of topoisomerase II inhibitor foods during pregnancy and AL. Conclusion: The results suggest that maternal intake during pregnancy of allium vegetables, specifically garlic, is inversely associated with the development of AL in children ≤24 months old. On the other hand, consumption of high-fat dairy products is positively associated with AL in children ≤24 months old.

Association Analysis Between the Functional Single Nucleotide Variants in miR-146a, miR-196a-2, miR-499a, and miR-612 With Acute Lymphoblastic Leukemia.

BACKGROUND: Acute lymphoblastic leukemia (ALL) is characterized by an abnormal proliferation of immature lymphocytes, in whose development involves both environmental and genetic factors. It is well known that single nucleotide polymorphisms (SNPs) in coding and noncoding genes contribute to the susceptibility to ALL. This study aims to determine whether SNPs in miR-146a, miR-196a-2, miR-499a, and miR-612 genes are associated with the risk to ALL in pediatric Mexican population. METHODS: A multicenter case-control study was carried out including patients with de novo diagnosis of ALL and healthy subjects as control group. The DNA samples were obtained from saliva and peripheral blood, and the genotyping of rs2910164, rs12803915, rs11614913, and rs3746444 was performed using the 5'exonuclease technique. Gene-gene interaction was evaluated by the multifactor dimensionality reduction (MDR) software. RESULTS: miR-499a rs3746444 showed significant differences among cases and controls. The rs3746444G allele was found as a risk factor to ALL (OR, 1.6 [95% CI, 1.05-2.5]; p = 0.028). The homozygous GG genotype of rs3746444 confers higher risk to ALL than the AA genotype (OR, 5.3 [95% CI, 1.23-23.4]; p = 0.01). Moreover, GG genotype highly increases the risk to ALL in male group (OR, 17.6 [95% CI, 1.04-298.9]; p = 0.00393). In addition, an association in a gender-dependent manner among SNPs located in miR-146a and miR-196a-2 genes and ALL susceptibility was found. CONCLUSION: Our findings suggest that SNP located in miR-499a, miR-146a, and miR-196a-2 genes confer risk to ALL in Mexican children. Experimental analysis to decipher the role of these SNPs in human hematopoiesis could improve our understanding of the molecular mechanism underlying the development of ALL.

Genotype-Environment Interaction Analysis of NQO1, CYP2E1, and NAT2 Polymorphisms and the Risk of Childhood Acute Lymphoblastic Leukemia: A Report From the Mexican Interinstitutional Group for the Identification of the Causes of Childhood Leukemia.

Background: Acute lymphoblastic leukemia (ALL) is the main type of cancer in children. In Mexico and other Hispanic populations, the incidence of this neoplasm is one of the highest reported worldwide. Functional polymorphisms of various enzymes involved in the metabolism of xenobiotics have been associated with an increased risk of developing ALL, and the risk is different by ethnicity. The aims of the present study were to identify whether NQO1, CYP2E1, and NAT2 polymorphisms or some genotype-environmental interactions were associated with ALL risk in Mexican children. Methods: We conducted a case-control study including 478 pediatric patients diagnosed with ALL and 284 controls (children without leukemia). Ancestry composition of a subset of cases and controls was assessed using 32 ancestry informative markers. Genetic-environmental interactions for the exposure to hydrocarbons were assessed by logistic regression analysis. Results: The polymorphisms rs1801280 (OR 1.54, 95% CI 1.21-1.93), rs1799929 (OR 1.96, 95% CI 1.55-2.49), and rs1208 (OR 1.44, 95% CI 1.14-1.81) were found to increase the risk of ALL; being the risks higher under a recessive model (OR 2.20, 95% CI 1.30-1.71, OR 3.87, 95% CI 2.20-6.80, and OR 2.26, 95% CI 1.32-3.87, respectively). Gene-environment interaction analysis showed that NAT2 rs1799929 TT genotype confers high risk to ALL under exposure to fertilizers, insecticides, hydrocarbon derivatives, and parental tobacco smoking. No associations among NQO1, CYP2E1, and ALL were observed. Conclusion: Our study provides evidence for the association between NAT2 polymorphisms/gene-environment interactions, and the risk of childhood ALL in Mexican children.

Uso de estudios de laboratorio y gabinete en pacientes con dolor abdominal no traumático, en el servicio de urgencias

Introducción: La evaluación del paciente con dolor abdominal agudo no traumático es un reto diagnóstico. El uso de pruebas de laboratorio y gabinete son herramientas útiles que nos permiten obtener información complementaria sobre cada paciente y con ello confirmar o descartar un diagnóstico y determinar su plan de acción. Objetivo: Estimar la frecuencia de uso de en el servicio de urgencias del Hospital General Regional No.72 en pacientes con dolor abdominal no traumático. Métodos: Se realizó un estudio retrospectivo, observacional, transversal y descriptivo donde se revisaron 126 expedientes clínicos de pacientes ≥20 años, que acudieron a urgencias por, los cuales contaban con una estancia de al menos 8 h y a quienes se practicó alguna; se excluyeron expedientes clínicos de mujeres embarazadas. Los datos se analizaron con estadística descriptiva. Resultados: Se realizaron 827 pruebas a 126 pacientes. Los principales estudios utilizados fueron: biometría hemática (99,2 %), glucosa, urea, creatinina, electrólitos y tiempos de coagulación (en el 100 % de los pacientes). Los estudios de gabinete más utilizados fueron: ultrasonido (31,7 %) y tomografía abdominal (11,9 %). Las cinco patologías más prevalentes fueron: colecistitis, infección urinaria, gastroenteritis, enfermedad ácido péptica y pancreatitis. Conclusiones: El dolor abdominal es una patología de etiología multivariada, por lo que su estudio adecuado es esencial para el manejo de las personas y la implementación de un sistema de gestión de calidad centrado en el paciente.

Introduction: The evaluation of the patient with non-traumatic acute abdominal pain is a diagnostic challenge. The use of laboratory and cabinet tests are useful tools allowing to obtain complementary information about each patient and thereby confirm or rule out a diagnosis and determine its action plan. Objective: To estimate the frequency of use of laboratory and cabinet tests in the emergency department at the Regional General Hospital No.72, in patients with non-traumatic abdominal pain from August to September 2017. Methods: A retrospective, observational, cross-sectional and descriptive study was carried out. One hundred twenty six (126) clinical records of patients ≥20 years old were reviewed, these subjects attended the emergency room for non-traumatic acute abdominal pain, and had a stay of at least 8 hours. They underwent some laboratory and cabinet tests. Clinical records of pregnant women were excluded. The data was analyzed with descriptive statistics. Results: Eight hundred twenty seven (827) tests were performed on 126 patients. The main studies used were blood count (99.2%), glucose, urea, creatinine, electrolytes and coagulation times (in 100% of patients). The most used cabinet studies were ultrasound (31.7%) and abdominal tomography (11.9%). The five most prevalent pathologies were cholecystitis, urinary infection, gastroenteritis, acid peptic disease and pancreatitis. Conclusions: Abdominal pain is a pathology of multivariate etiology, so adequate study is essential for the management of people and the implementation of a quality management system focused on the patient.