Benign tumour Malignant tumourBening tumour cells grow locally and cannot spread by metastasis. Hence they are harmless tumours.Malignant cells enter blood vessels and invade neighboring tissues. Hence they are harmful tumours.Benign tumors grow slowly.Malignant tumors grow more rapidly than benign tumors. They recur locally.They recur at distant sites such as the brain, lungs, bones and liver depending on the type of cancer.These tumors seldom recur after surgery.These tumors recur more commonly.