Biography
There at least two known artists under the name Canker:
1. Canker was a goregrind band from Sydney, Nova Scotia, Canada. Formed in 2002, released splits with bands like Plasma, Bowel Fetus, Pulmonary Fibrosis, etc. and frequently released on the D.I.Y. label, Fecal-Matter Discorporated. It's presumed has split-up but there is no official date regarding when they called it quits.
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Official Page:
http://myspace.com/cankergoregrind
2. Canker is a death / thrash metal band from Granada, Andalusia, Spain.
Biography text from Last.fm, available under CC BY-SA.