Mexico's border with America is clustered with clinics providing unusual treatments for cancer - alternatives to conventional medicine that claim to offer a complete cure, even for the terminally ill, in return for tens of thousands of dollars.

Dateline on Tuesday (9.30pm on SBS ONE) features an investigation into this multimillion dollar industry as Sarah MacDonald, a journalist who has been treated for cancer herself, goes undercover to find out if these clinics are offering genuine solutions or are just trading on the hopes of those desperate to survive.