Willis's definition of tumors:
Modern growth or tumor formation is an abnormal mass of tissues that grows irregularly and does not resemble normal tissue growth. And continue in the same way (invasion) growth even after the disappearance of the causative factor that led to the formation. It is automatic, without a goal, that intrudes on the organism and competes with it for food (this is the cause of death in tumors; tumor cells do not kill normal cells, but only deprive them of nutrition).
Modern growth or tumor formation is an abnormal mass of tissues that grows irregularly and does not resemble normal tissue growth. And continue in the same way (invasion) growth even after the disappearance of the causative factor that led to the formation. It is automatic, without a goal, that intrudes on the organism and competes with it for food (this is the cause of death in tumors; tumor cells do not kill normal cells, but only deprive them of nutrition).
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Oral tumors