Sirolimus, a drug typically used by transplant patients to prevent rejection, has been found in previous studies to have anti-cancer properties as well.  While it's not currently used to treat cancer, there may be a way to give those properties a boost, and make the drug a feasible option for cancer patients - by adding some grapefruit juice.

A new study from the University of Chicago Medicine revealed patients taking sirolimus receive more of its anti-cancer benefits if they drink a glass of grapefruit juice every day along with the drug.  The drug-juice combination was so effective that patients who drank grapefruit juice obtained three times as many benefits than those who took the drug alone.

This is also interesting because of grapefruits' dangerous interaction with some prescription medications, namely ones that treat high blood pressure and heart conditions.

Researchers had discovered sirolimus' potential anti-cancer properties from previous research.