Cancer and the immune system

In cancer, the immune system is of vital importance in at least two ways:
Recognizing and eliminating malignant tumors.
"Animal studies have conclusively shown that the immune system can recognize and eliminate malignant tumors in vivo (in the body)."
- Harrison's Principles of Internal Medicine,
14th Edition, Biologic Therapy, p. 535

Lessening the effects of cytotoxic (cell-killing) therapy such as chemotherapy.
"Autopsy studies show that most deaths from acute leukemia and half of deaths from lymphoma are caused directly by infection. With more intensive chemotherapy, patients with solid tumors have become more likely to die of infection rather than underlying disease."
- Harrison's Principles of Internal Medicine, 14th
Edition, Infections in Patients with Cancer, p. 537

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