(July 12, 2011 - Insidermedicine) From Cambridge - A new report published in Translational Psychiatry identifies a biomarker that may be linked to autism. Researchers compared 40 families that had one teenager with autism and one without to 40 teens with no family history of the condition. They found that the teens with autism and their siblings both had reduced activity in a part of the brain known to influence empathy, while the teens with no family history had normal brain functioning.   From France - Research published in Canadian Medical Association Journal argues that current alcohol consumption guidelines do not do enough to prevent cancer. Researchers believe that current guidelines focus too much on the short term effects of alcohol consumption, and do not take into account the long term association between alcohol and cancer. The researchers argue that guidelines need to be reviewed and reformed to adequately address this risk. And finally, from the UK - Sleep apnea may cause blood vessel abnormalities, according to a report published in Hypertension. Studying over 100 individuals, researchers found that those with obstructive sleep apnea but were otherwise healthy had impaired blood vessel functioning, though 26 weeks of CPAP treatment greatly improved blood function.