The former boss had been put into an induced coma as he recovered at the Salford Royal Hospital from his illness.
"The prognosis is extremely promising and it'll only be a matter of time before he's back at the "Theatre of Dreams", the source added.
A football fanatic through and through, United Kingdom paper The Sun reported that his first words when he came round were: "How did Doncaster get on today?" Under him the club won the Champions League twice, 13 Premier League titles and many other competitions.
Ferguson recorded 895 wins from 1,500 matches in charge during his 27 years in the dugout at United.
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He expects treatment guidelines to quickly change based on the study, which was conducted by a research group named ECOG-ACRIN. Other less common but more serious side effects of chemotherapy include bone loss and osteoporosis, heart and vision problems.
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Kim Yo-jong delivered a personal letter to South Korean President Moon Jae-in on behalf of her brother, Kim Jong Un at the time. Bush administration. "And so to build trust, I think that they should stop taking those unilateral actions at this point".