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Jake 'The Snake' Roberts: I Have Cancer

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Jake 'The Snake' Roberts at the 2013 Chicago Comic and Entertainment Expo in Chicago. Roberts tells TMZ he has cancer and needs emergency surgery. (Photo by Daniel Boczarski/Getty Images) | Daniel Boczarski via Getty Images

Jake "The Snake" Roberts has a cancerous tumor behind his knee ... and the wrestler says it's slowly growing into his muscle -- so he needs emergency surgery to remove the growth.

Roberts tells TMZ ... he noticed a tumor behind his knee the size of a half dollar last month so he had it tested ... and on Friday doctors told him the test came back positive for cancer.

Read the whole story at TMZ