As a result, the UK outfit has canceled all of its remaining 2018 tour dates.
The experimental singer had six tumors removed from her uterus in December 2017.
The game show’s longtime host had blood clots removed from his brain last month.
Longtime pianist, organist, and backing vocalist has been forced to miss the band’s recent North American and European tours.
Following a battle with stomach cancer, the soul legend will tour North America this summer and fall.