PHILADELPHIA, Pa. — Taking fish oil pills — which contain omega-3 fatty acids — could help immunotherapy drugs cure cancer, a new study reveals.

Researchers found omega-3 supplements boost these drugs' ability to attack tumors. In experiments with mice, the combination slashed cancer's spread through the body by two-thirds. Lead author Abigail Kelly, a research assistant at Harvard University, describes the results as "very promising."

"Dietary interventions can be powerful tools because they are relatively simple and inexpensive to implement," Kelly says in a media release. "Our findings show that omega-3 supplementation has the potential to broadly improve immunotherapy and other anti-cancer drugs in the clinical setting."