John McVie. The Fleetwood Mac bassist is taking a leave of absence from the band to undergo cancer treatment. The band announced the bad news on their Facebook Page and then confirmed the news to Rolling Stone over the weekend.

From the announcement on Facebook.

"FLEETWOOD MAC CANCELS AUSTRALIAN/NEW ZEALAND TOUR

Fleetwood Mac who has just completed the European leg of their phenomenally successful worldwide tour has announced the cancellation of their upcoming 14 date tour of Australia and New Zealand.

John McVie, one of the co founding and original members of Fleetwood Mac is now scheduled to be in treatment for cancer during that period of time.

"We are sorry to not be able to play these Australian and New Zealand dates. We hope our Australian and New Zealand fans as well as Fleetwood Mac fans everywhere will join us in wishing John and his family all the best.”

And Rolling Stone's story is here "Fleetwood Mac Cancel Tour as John McVie Undergoes Cancer Treatment"

"Just as the band embarked on their world tour last spring, Fleetwood Mac released their first new music in 10 years, a four-song EP called Extended Play. "We're doing the best business we've done in 20 years," guitarist Lindsey Buckingham told Rolling Stone in May. "There seems to be a cyclical re-igniting of interests, and there's certainly a lot more young people out there than three years ago."

Not sure if this will effect their NYE date in Las Vegas, or any other US dates that might have been planned.