Smoking can cause loss of the Y chromosome in blood cells, which may put male smokers at a greater risk of cancer, a new study has found. Researchers at Uppsala University in Sweden found an association between smoking and loss of the Y chromosome in blood cells. Loss of the Y chromosome was more common in heavy smokers compared to moderate smokers, the study found. Since only men have the Y chromosome, these results might explain why smoking is a greater risk factor for cancer among men and, in the broader perspective, also why men in general have a shorter life expectancy, researchers said.
A new strategy that focuses on targeting "hot zones" - areas where the risk of HIV infection is much higher than the national average - can help stop the spread of the virus in Africa, scientists say. Globally, more than 34 million people are infected with HIV; in sub-Saharan Africa alone, 3 million new infections occur annually. In an attempt to stop the spread of HIV, governments in the region are considering providing antiretroviral drugs to people who do not have the virus but are at risk for becoming infected, researchers said. Such drugs are known as pre-exposure prophylaxis, or PrEP.
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