Bellevision | Grapefruit juice ups efficacy of cancer drug Bellevision Sirolimus was the first of a series of drugs, known as mTOR inhibitors, that were developed to prevent rejection of transplanted organs but that also have anti-cancer effects. Patients who drank eight ounces a day of grapefruit juice increased their ... Grapefruit juice helps boost cancer drug, U. of C. study finds Grapefruit boosts power of cancer drug Grapefruit Juice Could Help Cancer Patients Save Money |