AceShowbiz - Megadeth star Dave Mustaine has been given a big boost in his cancer battle - his doctors are feeling "very positive" about his progress.

The 57-year-old rocker was diagnosed with throat cancer earlier this year and he announced his health struggles via social media in June, telling fans his doctors felt he had a "90 per cent success rate."

His diagnosis forced Megadeth to cancel their 2019 tour dates.

Mustaine released a statement updating fans on his condition on Tuesday, September 17, writing: "I'm almost through the last round of treatment and my doctors are feeling very positive regarding my progress."

"I want to thank all of you for the support and well wishes these last few months. I can't express enough gratitude as it has made this hard road easier knowing you are in my corner fighting with me! Over the next few weeks, my condition will be evaluated, and I will keep you posted on my progress."

Mustaine is still planning to make an appearance at the inaugural Megacruise in October, adding: "We can't wait to see you, and I know all of the other wonderful artists feel the same way. Let's make this event one for the record books. Less than 30 days till we are Thrashing through the Pacific! See you all very soon."