CNN

Snow told CNN Thursday his health is improving.

WASHINGTON (CNN) – While remaining coy about exactly when he plans to leave his post, White House Press Secretary Tony Snow told CNN Thursday his health is improving, citing two new medical tests this month which found the cancer has not spread beyond his colon.

"The tumors are stable - they are not growing," Snow said of the results from an MRI and a Cat Scan. "And there are no new growths. The health is good."

The press secretary, whose hair has turned gray during chemotherapy treatment, said his black hair is expected to grow back in about a month. "I'm also putting on weight again," he said after returning from a 10-day vacation. "I actually feel very good about" the health situation.

Snow added he has an appointment Friday with his oncologist where they will decide on some minor forms of chemotherapy to start as maintenance treatment.

Snow, who has previously said he will leave his post before the end of President Bush's second term, repeated that the decision is based on finances and not health. He took a major pay cut after leaving the world of cable television and talk radio to come to the White House in the spring of 2006.

The press secretary again refused to be precise about his departure date. "When I have something to announce, I'll announce it," he said.

– CNN White House Correspondent Ed Henry