Former F1 commentator Murray Walker has been diagnosed with a form of lymphatic system cancer.
The 89-year-old was diagnosed with cancer, which he stressed was "treatable", after breaking his pelvis in a fall. He will now undergo chemotherapy.
Walker said: "They've caught it incredibly early. It's treatable, the doctors say my condition is mild and I'm very hopeful."
The news of Walker's illness prompted a lot of support from well-wishers.
F1 star Jenson Button tweeted: "Just heard the news about Murray Walker, Murray is a true fighter... Get well soon matey.."
Meanwhile the Williams team tweeted a photo of Walker from 1986 in one of their cars, with the message: "Get well soon Murray!"
Mark Wilkin, BBC F1 editor, said on Monday: "I spoke with Murray this afternoon and it's good to hear he's in good spirits. Our thoughts are with him and we're all really hopeful he can make a full recovery."
TV sport commentator Jake Humphrey tweeted: ""Get Well Murray Walker! How about you all RT this & I'll email him tonight to tell him how much support is out there?"
An hour later he added: "I just emailed Murray to tell him how over 5000 of you RT'd my message in under an hour. I'll keep you all posted... #GetWellSoonMurray"
The Cancer Research UK website describes the lymphatic system as a "system of thin tubes" - called lymph vessels or lymphatic vessels - branching out throughout the body like the blood circulation.
But the lymphatic system tubes are much finer and carry a colourless liquid called lymph, the website says. Lymph is a clear fluid that circulates around the body tissues. It contains a high number of lymphocytes (white blood cells). Plasma leaks out of the capillaries to surround and bathe the body tissues. This then drains into the lymph vessels, it adds.
Walker's distinctive commentating style became synonymous with motor racing as he covered F1 for more than half a century before retiring in 2001. He returned to Radio Five Live to commentate on the British Grand Prix return of Lewis Hamilton in 2007.
A former ad executive, Walker was also behind the slogan "Opal Fruits: made to make your mouth water".