Can your own immune system kill cancer?

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By Jacqueline Howard, Source: CNN

Immunotherapy cancer treatment a game changer?

(CNN)There was another big win in the advancement of immunotherapy treatments for cancer this week.

The Food and Drug Administration approved an immunotherapy drug called Keytruda, which stimulates the body’s immune system, for the first-line treatment of patients with metastatic non-small-cell lung cancer.
In other words, the drug could be the very first treatment a patient receives for the disease, instead of chemotherapy. Keytruda is the only immunotherapy drug approved for first-line treatment for these patients.
So it seems, the future of cancer care may be in our own immune systems, but how exactly does it work, and what are its pros and cons?