Some previous studies have suggested that home pesticide exposure before birth and during a child's early years may increase the risk of childhood leukemia. To further investigate this, we pooled individual level data from 12 case–control studies in the Childhood Leukemia International Consortium. Exposure data were harmonized into compatible formats. Pooled analyses were undertaken using multivariable unconditional logistic regression. The odds ratio (ORs) for acute lymphoblastic leukemia (ALL) associated with any pesticide exposure shortly before conception, during pregnancy and after birth were 1.39 (95% confidence interval [CI]: 1.25, 1.55) (using 2,785 cases and 3,635 controls), 1.43 (95% CI: 1.32, 1.54) (5,055 cases and 7,370 controls) and 1.36 (95% CI: 1.23, 1.51) (4,162 cases and 5,179 controls), respectively. Corresponding ORs for risk of acute myeloid leukemia (AML) were 1.49 (95% CI: 1.02, 2.16) (173 cases and 1,789 controls), 1.55 (95% CI: 1.21, 1.99) (344 cases and 4,666 controls) and 1.08 (95% CI: 0.76, 1.53) (198 cases and 2,655 controls), respectively. There was little difference by type of pesticide used. The relative similarity in ORs between leukemia types, time periods and pesticide types may be explained by similar exposure patterns and effects across the time periods in ALL and AML, participants' exposure to multiple pesticides, or recall bias. Although some recall bias is likely, until a better study design can be found to investigate the associations between home pesticide use and childhood leukemia in an equally large sample, it would appear prudent to limit the use of home pesticides before and during pregnancy, and during childhood.

Background: Maternal prenatal supplementation with folic acid and other vitamins has been inconsistently associated with a reduced risk of childhood acute lymphoblastic leukemia (ALL). Little is known regarding the association with acute myeloid leukemia (AML), a rarer subtype. Methods: We obtained original data on prenatal use of folic acid and vitamins from 12 case-control studies participating in the Childhood Leukemia International Consortium (enrollment period: 1980–2012), including 6,963 cases of ALL, 585 cases of AML, and 11,635 controls. Logistic regression was used to estimate pooled odds ratios (ORs) and 95% confidence intervals (CIs), adjusted for child’s age, sex, ethnicity, parental education, and study center. Results: Maternal supplements taken any time before conception or during pregnancy were associated with a reduced risk of childhood ALL; odds ratios were 0.85 (95% CI = 0.78–0.92) for vitamin use and 0.80 (0.71–0.89) for folic acid use. The reduced risk was more pronounced in children whose parents’ education was below the highest category. The analyses for AML led to somewhat unstable estimates; ORs were 0.92 (0.75–1.14) and 0.68 (0.48–0.96) for prenatal vitamins and folic acid, respectively. There was no strong evidence that risks of either types of leukemia varied by period of supplementation (preconception, pregnancy, or trimester). Conclusions: Our results, based on the largest number of childhood leukemia cases to date, suggest that maternal prenatal use of vitamins and folic acid reduces the risk of both ALL and AML and that the observed association with ALL varied by parental education, a surrogate for lifestyle and sociodemographic characteristics.

Recently it was discovered that a transient activation of transcription factor NF-κB can give cells properties essential for invasiveness and cancer initiating potential. In contrast, most oncogenes to date were characterized on the basis of mutations or by their constitutive overexpression. Study of NF-κB actually leads to a far more dynamic perspective on cancer: tumors caused by diverse oncogenes apparently evolve into cancer after loss of feedback regulation for NF-κB. This event alters the cellular phenotype and the expression of hormonal mediators, modifying signals between diverse cell types in a tissue. The result is a disruption of stem cell hierarchy in the tissue, and pervasive changes in the microenvironment and immune response to the malignant cells.

To investigate the presence of early indicators of the dysmetabolic syndrome (DS) in young survivors with acute lymphoblastic leukemia (ALL) in childhood. We enrolled 80 patients with ALL (50 males, median age 13.9 y, median interval since completion of chemotherapy 6.3 y). Sixty-two patients (group A) received chemotherapy only, whereas 18 patients (group B) received chemotherapy and cranial irradiation (18 Gy). Frank obesity [25%; confidence interval (CI) 95%, 16.7%-35.6%], increased blood pressure (21%; CI 95%, 13.6%-31.5%), increased serum triglycerides (21%; CI 95%, 13.6%-31.5%), reduced serum high-density lipoprotein cholesterol (12%; CI 95%, 6.7%-21.7%), increased fasting insulin (8%; CI 95%, 3.2%-15.7%), and osteopenia (71%; CI 95%, 60.5%-80.1%) were detected in groups A and B. Reduced IGF-1 (15%; CI 95%, 8.6%-24.6%) and thyroid hormone abnormalities (11%; CI 95%, 5.8%-20.2%) were detected only in group B. In group B, there was a statistically significant increase in the prevalence of obesity (P=0.024), hyperinsulinemia (P=0.004), and the full DS (22%; CI 95%, 8.6%-45.9% vs. 8%; CI 95%, 3.1%-18.0%; P=0.017) compared with group A. Young survivors of childhood ALL, especially those treated with cranial irradiation, are at risk for obesity, dyslipidemia, insulin resistance, hypertension, and the full DS early after the completion of therapy.

A combination of experiment and theory has been used to assess the potential use of the zeolite BEA as a drug delivery agent. Molecular dynamics (MD) has been used to examine the diffusion of two different drug molecules, salbutamol and theophylline, inside the zeolite BEA. MD shows that the two molecules display different diffusion behaviour, with the salbutamol molecule able to diffuse more freely than theophylline within the internal channel system of the zeolite. Several experimental techniques have been used to investigate the loading and release of the drug molecules from the BEA host. The results obtained support the observations from the modelling and suggest that modelling has an important role to play in screening zeolite–drug combinations prior to experimental investigation.