Teenagers who are part of close-knit neighborhoods and families are less likely to have sex at a young age, a new study has found. On the other hand, teens’ schools have less influence on their sexual behavior, researchers report. “Our results echo other studies’ findings on the importance of families and neighborhoods in protecting youth from risky behaviors, and show that feeling connected to one’s local community can mitigate sexual risky behaviors,” said lead researcher Dr. Camila Cribb Fabersunne, a pediatrician with the University of California, San Francisco (UCSF). Teens whose parents restricted their dating were 55% less likely to have sex by 10th grade, results showed. So were kids who spend less time alone when home (8% less likely), and who had tight-knit families (7% less likely). Teenagers from close-knit neighborhoods were 10% less likely to have sex by 10th grade, results show. However, no school factors were associated with delaying sex until later in high school, researchers found. Meanwhile, teens from disadvantaged neighborhoods with less education were about 24% more likely to have sex by 10th grade, researchers added. “Parents should not underestimate the impact they can have on their children,” said senior researcher Dr. Tracy Richmond, a professor of pediatrics at Harvard Medical School. “Simple parenting strategies like limiting dating can make a big difference on the timing of their child’s first sexual encounter, which…  read on >  read on >

One of the biggest obstacles to treating brain cancer is getting tumor-killing drugs past the blood-brain barrier that normally protects the brain from foreign invaders. Now, new research shows that ultrasound waves emitted from a device implanted in a cancer patient’s skull could be the key to getting chemotherapy and immunotherapy drugs into the brain. This ultrasound technology allowed doctors at Northwestern Medicine in Chicago to get a small dose of these drugs past the blood-brain barrier, according to a report published June 6 in the journal Nature Communications. What’s more, the treatment boosted the immune system’s recognition of brain cancer cells, the researchers added. “This is the first report in humans where an ultrasound device has been used to deliver drugs and antibodies to glioblastoma to change the immune system, so it can recognize and attack the brain cancer,” said researcher Dr. Adam Sonabend, an associate professor of neurological surgery at Northwestern University Feinberg School of Medicine. “This could be a major advance for the treatment of glioblastoma, which has been a frustratingly difficult cancer to treat, in part due to poor penetration of circulating drugs and antibodies into the brain,” Sonabend added in a Northwestern news release. The study involved four patients with advanced brain cancer. They had already been treated with chemotherapy and had taken part in an experimental clinical trial, but…  read on >  read on >

In new guidelines released Tuesday, U.S. health officials now recommend that certain people take the antibiotic doxycycline as a morning-after pill to lower the risk of some sexually transmitted diseases (STDs). The latest recommendations only apply to gay and bisexual men and transgender women who have had an STD in the past year and are at high risk of getting infected again. While past research has shown that doxycycline works for those populations, there’s not enough evidence to recommend the preventive treatment, known as doxy PEP, for all American adults, the U.S. Centers for Disease Control and Prevention noted. The new guidelines were published in the CDC publication Morbidity and Mortality Weekly Report. CDC officials stressed that better ways to slow the spread of STDs are needed. “No vaccines and few chemoprophylaxis options exist for the prevention of bacterial sexually transmitted infections… [specifically syphilis, chlamydia, and gonorrhea]. These infections have increased in the United States and disproportionately affect gay, bisexual and other men who have sex with men [MSM] and transgender women,” wrote researchers led by Laura Bachmann, chief medical officer of the CDC’s Division of STD Prevention. “In three large randomized controlled trials, 200 [milligrams] mg of doxycycline taken within 72 hours after sex has been shown to reduce syphilis and chlamydia infections by >70% and gonococcal infections by approximately 50%,” they added. When…  read on >  read on >