When the Tumors are external and attached to soft parts only, an early removal may lead to recovery.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
As the Tumors grow they may interfere with the natural functions of the body.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Still, this theory falls far short of answering the question as to the origin of Tumors.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler