Search

Objective: The purpose of this review was to assess the prevalence of unprotected anal intercourse (UAI) among men who have sex with men (MSM) in China., Methods: A comprehensive search was conducted including online databases like "Wanfang", Chinese National Knowledge Infrastructure, PubMed and manual searches. Analyses using random-effects models were performed to estimate the prevalence of UAI among MSM in China., Results: Sixty-two articles reporting eighty-two studies were selected. The pooled prevalence rates of UAI with any male partner, with regular male partners, with non-regular male partners, with casual male partners, and with commercial male partners among MSM were 53%(95%CI: 51-56%), 45%(95%CI: 39-51%), 34%(95%CI: 24-45%), 33%(95%CI: 30-36%), 12% (95%CI: 5-26%), respectively. A cumulative meta-analysis found that the pooled UAI prevalence decreased over time., Conclusions: Although the prevalence of UAI with male partners among MSM in China presents a decreasing trend over the past decade, the concomitant rise in HIV prevalence and incidence indicates that current prevention intervention efforts are insufficient to effectively contain the spread of HIV. Therefore, the persistently high prevalence of risky sexual behaviors underscores the need for innovative and effective prevention strategies among MSM.

Mammaglobin A (MGBA) is a novel breast cancer-associated antigen almost exclusively over-expressed in primary and metastatic human breast cancers, making it a potential therapeutic target for breast cancer. The development of dendritic cell (DC)-induced tumor antigen specific CD8(+) cytotoxic T lymphocytes (CTLs) may hold promise in cancer immunotherapy. In this study we constructed recombinant replication-defective adenoviral (Ad) vectors encoding MGBA and evaluated their ability to trigger anti-tumor immunity in vitro. DCs were isolated from the human peripheral blood monocyte cells (PBMCs) of two HLA-A33(+) healthy female volunteers, and infected with adenovirus carrying MGBA cDNA (Ad-MGBA). After that, the Ad-MGBA-infected DCs were used to stimulate CD8(+) CTLs in vitro and the latter was used for co-culture with breast cancer cell lines. The data revealed that infection with Ad-MGBA improved DC maturation and up-regulated the expression of co-stimulatory molecules and the secretion of interleukin-12 (IL-12), but down-regulated interleukin-10 (IL-10) secretion from DCs. Ad-MGBA-infected DC-stimulated CD8(+)CTLs displayed the highest cytotoxicity towards HLA-A33(+)/MGBA(+) breast cancer MDA-MB-415 cells compared with other CD8(+)CTL populations, and compared with the cytotoxicity towards HLA-A33(-)/MGBA(+) breast cancer HBL-100 cells and HLA-A33(-)/MGBA(-) breast cancer MDA-MB 231 cells. In addition, Ad-MGBA-infected DC-stimulated CD8(+) CTLs showed a high level of IFNγ secretion when stimulated with HLA-A33(+)/MGBA(+) breast cancer MDA-MB-415 cells, but not when stimulated with HLA-A33(-)/MGBA(+) HBL-100 and HLA-A33(-)/MGBA(-)MDA-MB-231 cells. In addition, killing of CD8(+)CTLs against breast cancer was in a major histocompability complex (MHC)-limited pattern. Finally, the data also determined the importance of TNF-α in activating DCs and T cells. These data together suggest that MGBA recombinant adenovirus-infected DCs could induce specific anti-tumor immunity against MGBA(+) breast cancers, which could provide a novel strategy in the immunotherapy of breast cancer.