Curing cancer or 'selling hope' to the vulnerable?

Hundreds of thousands of pounds have been raised to send British patients to a doctor in America who claims he can "cure cancer".

But Dr Stanislaw Burzynski's treatment has been dismissed by mainstream medicine and he has never been licensed by the US authorities.

Dr Burzynski exploits a legal loophole where the patients treated with antineoplastons do so as part of a clinical trial, so the drug does not need a licence.

Find out more in Panorama Cancer: Hope for Sale? on Monday 3 June at 20:30 BST on BBC One.

Richard Bilton reports.