More than half of those seeking a diagnosis for dementia have delayed going to their GP by at least a year, according to a survey carried out by the Alzheimer's Society.

Fifteen cancer charities say they are "deeply concerned" about new plans for approving innovative cancer medicines for the NHS in England.

Polio could be eradicated in Pakistan within months, the World Health Organisation says, as a mass vaccination drive is launched in the north-west.

A hospital in Boston becomes the first in the US to perform a successful penis transplant, say doctors, calling the operation "a surgical milestone".

US scientists say they have managed to clone the Zika virus - an important step towards fast-tracking a vaccine against the disease.

An "intelligent" prosthetic limb, improved MRI scanners and green engines are the three finalists for a major UK engineering prize.