You may have missed it so it bears repeating once...

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Yes founding member, bassist and vocalist Chris Squire has a rare form of leukemia and has asked band alumnus Billy Sherwood to take his place on the tour with Toto as well as the Cruising To The Edge fan cruise ship excursion.

Squire has made every tour since the group's founding in 1968.

http://yesworld.com/2015/05/chris-squire-to-undergo-treatment-for-leukemia/