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While immediate rejection was not seen, in part due to treatment with medications that suppressed it, the new study found evidence of subtler reactions that could cause xenotransplants to fail over time.

“Their enormous efforts leading the xenotransplant gave our family seven more weeks with Rick, and our memories made during that time will remain in our minds and hearts,” the statement said.

Pisano is the first woman to receive a pig organ — and unlike with prior xenotransplant experiments, both her heart and kidneys had failed.

Animal-to-human transplants, called xenotransplants, have failed for decades because people’s immune systems rejected the foreign tissue.

The world's second xenotransplant recipient, Lawrence Faucette, died Tuesday at age 58.