<p>ExThera, a US-based medical startup, claimed that its cutting edge blood-filtering device could cure cancer.  Intrigued, an American billionaire named Alan Quasha capitalized on its promise, bought the devices, and started running a medical clinic on the Caribbean island of Antigua outside the purview of US regulators, offering desperate, terminally ill cancer patients a chance of being healthy again — at the price of $45,000 for each round of treatment.  But as The New York Times reports, of the roughly two dozen patients treated at the Antigua clinic using the ExThera device, at least six died, likely as a result […]</p>