Cancer Institute A national cancer institute
designated cancer center

Benign Versus Malignant

Cancer is an abnormal, continual multiplying of cells. The cells divide uncontrollably and may grow into adjacent tissue or spread to distant parts of the body. The mass of cancer cells will eventually become large enough to produce lumps, masses, or tumors that can be detected. These lumps, masses, or tumors can be benign or malignant:

Benign Tumors

Benign tumors are not cancerous. They:

Malignant Tumors

Malignant tumors are cancerous. They:

Stanford Medicine Resources:

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