The MEGADETH leader broke the news of his diagnosis earlier today via his social media.
He wrote: "I've been diagnosed with throat cancer. It's clearly something to be respected and faced head on — but I've faced obstacles before. I'm working closely with my doctors, and we've mapped out a treatment plan which they feel has a 90% success rate. Treatment has already begun.
"Unfortunately, this requires that we cancel most shows this year. The 2019 Megacruise will happen, and the band will be a part of it in some form. All up to date information will be at megadeth.com as we get it. MEGADETH will be back on the road ASAP.
"Meanwhile, Kiko [Loureiro, guitar], David [Ellefson, bass], Dirk [Verbeuren, drums] and I are in the studio, working on the follow up to 'Dystopia' — which I can't wait for everyone to hear.
"I'm so thankful for my whole team — family, doctors, band members, trainers, and more.
"I'll keep everyone posted.
"See you soon, Dave Mustaine"
Get well soon Dave - HBH