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Objective: Genome-wide association studies (GWAS) of gastric cancer have reported differences in single-nucleotide polymorphism (SNP) associations for tumour subtypes, particularly when divided by location into the gastric cardia versus the non-cardia., Design: Here we present results for a GWAS using 2350 East Asian gastric cancer cases divided as 1189 gastric cardia and 1027 gastric non-cardia cases and 2708 controls. We also included up to 3042 cardia cases, 4359 non-cardia cases and 7548 controls for replication from two Chinese studies and one Korean study. From the GWAS, we selected 12 top SNPs for each gastric cancer subtype, 4 top SNPs for total gastric cancer and 1 SNP in MUC1 for replication testing., Results: We observed genome-wide significant associations for rs10074991 in PRKAA1 at 5p13.1 for cardia (p=7.36×10(-12)) and non-cardia cancers (p=2.42×10(-23)) with per allele OR (95% CI) for the combined endpoint of 0.80 (0.77 to 0.83). At 6p21.1, rs2294693 near UNC5CL was significantly associated with gastric non-cardia cancer risk (p=2.50×10(-8)), with OR (95% CI) of 1.18 (1.12 to 1.26), but there was only a nominal association for cardia cancer (p=1.47×10(-2)). We also confirmed a previously reported association for rs4072037 in MUC1 with p=6.59×10(-8) for total gastric cancer and similar estimates for cardia and non-cardia cancers. Three SNPs in PSCA previously reported to be associated with gastric non-cardia cancer showed no apparent association for cardia cancer., Conclusions: Our results suggest that associations for SNPs with gastric cancer show some different results by tumour location in the stomach., (Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/)

Many studies conducted in the United States (U.S.) have documented a positivity effect in aging-a tendency for older adults to remember more positive than negative information in comparison to young adults. Despite this cognitive emotional benefit, U.S. adults still hold a more negative view of aging compared to adults in Asia. We hypothesized that these aging stereotypes may contribute to different patterns of age-related emotional memory processing in the two cultures. In the present study, we tested young and older adults in the U.S. and China on a View of Aging task and an emotional picture memory task. Chinese older adults hold a significantly more positive view of aging compared to all other groups of participants. Older adults in both countries demonstrated an age-related positivity effect, but Chinese older adults showed a trend in remembering fewer negative pictures than their American counterparts. These findings suggest that aging stereotypes might significantly influence older adults' cognitive abilities.

Helicobacter pylori is known to be a major cause of gastric carcinoma and peptic ulceration. cagA positivity and vacA's signal regions and mid-regions are well-characterized markers of H. pylori's virulence. Recently, an intermediate region has been identified as another strong marker of H. pylori-associated disease, and its i1 allele has been linked with severe diseases in colonized hosts. The goal of this study was to determine the prevalence of the intermediate alleles in H. pylori isolates from China, Turkey, and Uruguay and from U.S. Africans and to compare their distribution with other well-characterized virulence factors. Originally, 123 H. pylori strains were studied, but 3 were excluded due to the failure to amplify the intermediate region in these samples. Therefore, a total of 120 strains were analyzed: 30 Chinese isolates, 35 Turkish isolates, 30 Uruguayan isolates, and 25 U.S. African isolates. The s type and the m type were determined by PCR amplification. The i type was identified by PCR amplification and DNA sequencing. CagA status was determined by PCR methodology. There was a strong correlation among CagA positivity, s1, and i1 in Chinese, U.S. African, and Uruguayan isolates, but less correlation among these markers in Turkish isolates. A new intermediate variant (i3) was identified in 25.7% of Turkish strains and 3.3% of the Chinese strains. In summary, the distribution of CagA positivity and s1 correlated with the i1 in the three populations, except in the Turkish population, which showed a disproportionate representation of the i3 allele. Phylogenetic mapping confirmed the i-typing method previously defined and adopted for this study. The phylogenetic tree showed country-specific correlation with the intermediate region. Our results showed that the i1 allele is strongly associated with CagA positivity and the vacA s1 allele, suggesting its role as a virulence marker and potential predictor for clinical outcome.

We conducted, in four languages, the first national cross-sectional survey of the knowledge, attitudes, and practice with respect to epilepsy of Chinese- and Vietnamese-American adults. We used a convenience sampling method to recruit 2831 adults in seven states. Eighty-four percent had heard or read of epilepsy and 58% had seen a seizure, whereas only 34% knew someone with epilepsy. Forty-two percent would object to their children marrying a person with epilepsy, and 43% would not knowingly hire someone with epilepsy. We examined bivariate associations for questions of knowledge, attitudes, and practice with age, gender, ethnicity, nativity, language, and education. chi(2) analyses showed differences in knowledge of and attitudes toward epilepsy by age group, gender, ethnicity, and education. Although misconceptions and negative views about epilepsy are held by Chinese and Vietnamese populations living in the United States, our results show noteworthy differences in attitudes and practice in relation to previous studies in Asian countries., ((c) 2009 Elsevier Inc. All rights reserved.)