Her physician at Cedars-Sinai Medical Center in Los Angeles, Dr.
Graham Woolf, said Cole has had a "terrific response to her medication and is now virus negative."
"This gives her an increased chance of cure," he said. Woolf said Cole is recovering from side effects of the medicine she's taking, including fatigue, muscle aches and dehydration.
Cole, 58, the daughter of jazz legend Nat King Cole, has sold millions of records over her long career. She is due to release "Still Unforgettable," the follow-up to 1991's Grammy-winning, multi-platinum CD "Unforgettable ... With Love," on which she remade some of her father's classics, in September.