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People with poor oral health are more likely to have an oral infection with human papillomavirus. Even after the researchers factored in risks from smoking and oral sex, poor oral hygiene appeared to be an important factor.

Dermatologists say it's a lot easier to manage the skin cancer risk to young people from indoor tanning than it is to ban the sun. But the indoor tanning industry says doctors should be more focused on skin cancer in older folks.

There's a difference between knowing your breast cancer risk and believing it. When psychologists asked several hundred women to plug personal health data into an online tool that then calculated their breast cancer risk, nearly 20 percent rejected their scores as wrong.

Doctors have debated for years whether a drug that curbed the growth of some prostate cancers caused more serious ones to grow faster. Now, a long-term study calms those fears and raises the possibility that a cheap, generic pill could be used reduce prostate cancer risk.

Sometimes the condition a doctor labels as cancer isn't much of a health threat. Some cancer specialists are now looking at whether it's time to rethink what gets called cancer to lower anxiety and cut waste.

The question of how to treat ductal carcinoma in situ is roiling the medical profession, and making for tough choices for women. The condition may never become invasive cancer. But some women choose to have mastectomies rather than live with uncertainty.

Most people get diagnosed with lung cancer when it's too late to effectively treat it. A federal panel is trying to improve the odds by saying that longtime smokers and former smokers should get annual CT scans to check for lung cancer.

One study finds that women who have been vaccinated against HPV are much less likely to have throat infections with the virus. Since the vaccine helps reduce risk of some cancers, scientists think it might turn out to be effective against throat cancers, too.

Geneticists, pharmacologist and mathematicians combine their powers to answer one of the most vexing questions in modern oncology: Why don't anti-cancer drugs always work?

In 2007, 4-year-old Faith Marr was diagnosed with a rare bone cancer. Doctors were uncertain about her chances of survival. Faith and her father, Jerris, talk about how their bond grew stronger during hospital stays when he would "tattoo" her favorite things on her skin and scars.