A chemical used to help treat diseased kidneys has plaintiffs lawyers salivating at the thought of a new arena of billion-dollar mass torts, but one San Francisco firm wants to take it one suit at a time.

“I think the work that we do [in the first case] will set the tone for other cases; and of course we’re hoping to get other cases as well,” said Jeffrey Kaiser, a partner at Levin Simes Kaiser & Gornick.