Men with colon cancer tend to have more advanced tumors than women of the same age, according to a new study that suggests screening guidelines may need to be adjusted for sex and age.

Currently, men and women age 50 and older are urged to get acolonoscopy to screen for growths or polyps that could form into tumors. Colorectal cancer is the fourth leading cancer killer worldwide, taking 610,000 lives per year.

Pfizer Inc. and a pharmacy standards group are teaming to warn U.S. consumers about the risks of counterfeit prescription medicines, which endanger the public and take money from both pharmacies and legitimate drugmakers.

Pfizer Inc., whose impotence pill Viagra is widely counterfeited, and the National Association of Boards of Pharmacy on Thursday announced the start of an educational campaign to explain the dangers of counterfeit drugs and help people find legitimate pharmacies online.

A new government report looking into smoking by occupation says construction workers, miners and food service workers smoke the most. Experts say that may have as much to do with education levels as the jobs themselves.

The Centers for Disease Control and Prevention study found 19.6 percent of working adults smoke, but as many as 30 percent in the mining, construction and food service industries smoke.

Officials say Japan is ordering more tests on rice growing near a crippled nuclear power plant after finding elevated levels of radiation.

The government officials said Saturday that a sample of unharvested rice contained 500 becquerels of cesium per kilogram.

Research over the last decade showing that proteins called sirtuins can increase lifespan is deeply flawed, according to a new study in Nature that debunks prior claims of a direct causal link.

Pioneering experiments on earthworms and fruitflies -- commonly used as models to examine the biology of human ageing -- suggested that an extra dose of the naturally-occurring enzymes could prolong life by up to 50 percent.

Worrying levels of BPA, an industrial chemical with suspected links to cancer, lurk inside canned soups and pasta targeted at American children, the Breast Cancer Fund said Wednesday.

In a product testing report, the non-profit advocacy group -- which focuses on environmental causes of cancer -- said an average of 49 parts per billion of BPA, or bisphenol A, was detected in a dozen cans of food items tested.

The vaccine for whooping cough commonly administered to young children loses its effectiveness after three years, according to the preliminary results of a new U.S. study.

The results released on Monday come from a survey of 15,000 children in Marin County, California, where an outbreak of the bacterial disease killed 11 infants and infected more than 8,000 people in 2010.

A global campaign to save new mothers and children under five in developing nations has made strong gains but is set to fall well shy of U.N. goals, according to a study released Tuesday.

Only nine out of 137 countries are on track to meet the twin Millennium Development Goals (MDG), set in 2000, of slashing child mortality by two-thirds between 1990 and 2015, and maternal deaths by three-quarters over the same period.

U.S. industrial conglomerate General Electric said on Thursday that it would invest $1 billion in cancer research over the next five years.

GE chief executive Jeff Immelt and several venture capital partners launched the initiative, which will be aimed at improving diagnostic techniques for breast cancer, the company said in a statement.

Could Paleolithic man hold the key to today's nutrition problems?

A growing number of adherents to the so-called "caveman" diet contend that a return to the hunter-gatherer foods of the Stone Age -- heavy on meats, devoid of most grains -- could alleviate problems like obesity, type 2 diabetes and many coronary problems.