http://www.bbc.com/news/health-36482367

There has been widespread criticism of the pharmaceutical industry, including from groups such as Medicins Sans Frontieres, for pricing the poorest people out of life-saving drugs.

But Mr Soriot, a former vet, said, when it came to cancer drugs, this was unfair.

He said: "In some cases, it's not realistic.

"In some parts of Africa, we could give our products away and it would make no difference

"It is not only a question of medicine, it is a question of infrastructure. Where is the hospital? Where is the doctor?

"One of the things we have to do is educate physicians so the diseases can be diagnosed and treated."

Mr Soriot said high blood pressure was a bigger concern than cancer in Africa and that the company was offering hypertension medicines for "almost nothing" while training people to do blood-pressure screening.

"We have now diagnosed and treated more than 500,000 patients in this pilot programme [in Kenya], and we're expanding it," he said.