Broadcaster Bob Harris has begun an intensive course of intravenous radiotherapy.
The veteran radio presenter, 80, revealed in April that his prostate cancer had spread to his upper spine.
In June, he stepped down from his Radio 2 shows Sounds Of The 70s and Radio 2 Country to focus on treatment and recovery.
In a heartfelt update shared on Instagram, Mr Harris said: "I have been missing my programmes so much, but this space has given me a most beautiful summer here at home, enjoying a most precious commodity… TIME."
"I feel very blessed to have been able to spend lovely moments with family and friends (some of which I’ve posted here on Instagram) in the glorious summer sunshine, but during this time my cancer has been getting more of a hold.
"I still feel well but I am now at the start of an intensive course of intravenous radiotherapy which we are confident will keep things at bay.
"I should know the outcome quite soon."
Mr Harris described the experience as "It’s a very emotional roller coaster," but said he remains positive.
He said: "But, as you know, I’m an extremely positive person, and I continue to be determined to continue to get the best out of every day."
He said: "It isn’t always easy" and that he was in tears when he left the hospital with his son Miles on Friday.
He offered words of encouragement to others facing hardship.
Mr Harris said: "My message to you if you too are going through a difficult time is this: NEVER GIVE IN.
"Fight with all your might to keep going."
He also thanked fans and friends for their support.
He said: "Your kind words mean more than you will ever know, and always remember…live every day the best you can and just keep going.
"You can do this."
The broadcaster also confirmed he still plans to appear onstage at the Stand By Me: Bob Harris – A Celebration of Life In Music tribute concert in December at the Royal Albert Hall.
Mr Harris said: "I am still working and looking way into the future."
He announced his departure from his Radio 2 shows in June, calling it "one of the hardest decisions of my life."
With a broadcasting career spanning almost 56 years, Mr Harris is also known for his work on Radio 1, BBC Six Music, and the iconic BBC television show Old Grey Whistle Test.
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