Fallen vaccination rates pose a threat to this vulnerable population.
Cancer cells become super-charged when exposed to methylmalonic acid, a chemical that builds up in older people's bodies.
A special type of spectroscopy helped doctors differentiate between tumors in mice that responded to radiation therapy and those that resisted it.
Scientists sound alarm over radiation in Nubian Aquifer, but other experts say the health risk is unclear.
Checkpoint inhibitors lift the brakes on the immune system, but may join other new drugs in pressing the accelerator on health care costs.
James P. Allison and Tasuku Honjo share prize for discovery of checkpoint inhibitors for cancer therapy.