Sir Michael Parkinson was diagnosed with prostate cancer in May after a routine health check and doctors immediately began organising his treatment, which involves five sessions of radiotherapy a week.
The renowned journalist and interviewer said he was left in shock by the diagnosis, but said he was "in wonder" at the "marvelous" work of medical staff after initial thoughts of his own mortality.
The 78-year-old said: "I had to start calling a few of my social engagements to tell them I couldn't do it - what do you say to them?
"When you are told you have something like cancer, it is a shock. But the cancer specialist said: 'I will assure you, you will not die of this.'
"I am concerned about it, of course, but I am not frightened of it."
More top news
Republican Presidential candidate has encouraged Russia to find and release thousands of Hillary Clinton's private emails.
In the run-up to the Rio Olympic Games, ITV News speaks to four Olympic hopefuls in Team GB. Today we profile boxer Antony Fowler.
The man's identity card was alleged to have been found at the home of the other assailant, Adel Kermiche, who was named on Tuesday.