Chinese researchers are reporting new steps in the quest for animal-to-human organ transplants — with a successful pig kidney transplant and a hint Wednesday that pig livers might eventually be useful, too.

A Chinese patient is the third person in world known to be living with a gene-edited pig kidney. And the same research team also reported an experiment implanting a pig liver into a brain-dead person.

Scientists are genetically altering pigs so their organs are more humanlike in…