Objective To evaluate the compliancy of HIV pre-exposure prophylaxis (PREP) in men who have sex with men (MSM) in Chengdu,Sichuan province,and explore the influencing factors.Methods From 1 July 2013 to 30 September 2015,a random,open,multi-center and parallel control intervention study was conducted in 328 MSM enrolled by non-probability sampling in Chengdu.The MSM were divided into 3 groups randomly,i.e.daily group,intermittent group (before and after exposure) and control group.Clinical follow-up and questionnaire survey were carried out every 3 months.Their PrEP compliances were evaluated respectively and multivariate logistic regression analysis was conducted to identify the related factors.Results A total of 141 MSM were surveyed,in whom 59(41.8％) had good PrEP compliancy.The PrEP compliancy rate was 69.0％ in daily group,higher than that in intermittent group (14.3％),the difference had significance (x2=45.29,P＜0.001).Multivariate logistic analysis indicated that type of PrEP was the influencing factors of PrEP compliancy.Compared with daily group,the intermittent group had worse PrEP compliancy (OR=0.07,95％CI:0.03-0.16).Conclusion The PrEP compliance of the MSM in this study was poor,the compliancy would be influenced by the type of PREP.

Objective:To investigate the independent and combined effects of maternal smoking during pregnancy and offspring genetic susceptibility on overall cancer mortality.Methods:Based on the United Kingdom Biobank ( n=419 228) data, the Cox proportional hazard regression model was used to estimate the effect of maternal smoking during pregnancy on offspring overall cancer (including 16 cancers in men and 18 in women) mortality and its combined effect and interaction with offspring genetic factors. Results:Maternal smoking during pregnancy was significantly associated with a 13% increased risk of overall cancer mortality in men [hazard ratio( HR)=1.13, 95% CI: 1.06-1.20] and 19% increased risk in women ( HR=1.19, 95% CI: 1.11-1.27). Participants with high genetic risk had the highest overall cancer mortality than those with low genetic risk (men: HR=1.42, 95% CI: 1.30-1.55; women: HR=1.38, 95% CI: 1.25-1.52). Compared with participants without maternal smoking during pregnancy and low genetic risk, those with maternal smoking during pregnancy and high genetic risk were associated with a 56% increased risk of overall cancer mortality in men ( HR=1.56, 95% CI: 1.37-1.77) and 59% in women ( HR=1.59, 95% CI: 1.39-1.83). Conclusion:Maternal smoking during pregnancy may increase offspring overall cancer mortality and more severe harm in individuals with high genetic risk.