Former U.S. Sen. Paul Tsongas was released from a hospital Monday, three weeks after he received a bone marrow transplant from his twin sister.
The 1992 Democratic presidential candidate was diagnosed in November with myelodysplasia, a precancerous disorder that resulted from treatments he underwent for lymphoma more than 10 years ago.
His doctor said the transplanted marrow appeared to be growing well, but it could take a year for Tsongas to resume his full schedule.
Tsongas, 55, returned to his home in Lowell. He will continue to be treated as an outpatient.