A rare and always fatal disease striking roughly one Ferengi in five million, with which Quark is wrongly diagnosed, prompting him to sell his remains on the futures market.
Dorek Syndrome appears in the Deep Space Nine episode Body Parts. Quark returns from Ferenginar with a diagnosis from Dr Orpax, one of the most expensive physicians on the planet: he has the syndrome and about a week to live.
To clear his debts he auctions his vacuum-desiccated remains in advance, and an anonymous bidder buys the whole lot for five hundred bars of latinum. Orpax then admits that he made a mistake and that Quark is healthy.
The buyer is Brunt of the Ferengi Commerce Authority, who insists on delivery. Quark must die or break a contract, the gravest offence in Ferengi society. He breaks it, and Brunt strips him of his business licence and assets.