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Founding Fleetwood Mac member John McVie is battling cancer.  

The band made the announcement via Facebook over the weekend.  The group explains in a post that they're canceling their upcoming dates in Australia and New Zealand so John can undergo treatment. 

They don't specify what type of cancer McVie has, or what led to his diagnosis.  Fleetwood Mac adds their apologies to their fans "down under," and is asking all of the band's fans to wish "all the best" to McVie and his family. 

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