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"As alternatives to autologous skin grafts, artificial skin substitutes including cultured epidermis and reconstituted skins have been developed," says the lead author of the study Dr. Hisato Nagano.

Matosevic said traditional cell therapies have almost exclusively been autologous, meaning taken from and returned to the same patient.

But Mr. Scalise said Tuesday that after being in isolation for weeks as he received an autologous stem-cell transplant, he had been cleared by his doctors to travel.

Both are autologous therapies, which means they use a person’s own cells.

Having suffered a relapse, Joe would have to endure four more months of chemotherapy and autologous stem cell transplants.