Is low dose naltrexone an alternative to treat cancer?

Maybe. Currently it is not a standard of care for cancer treatment, and there is not enough research yet to give a definite answer but some of the studies suggest it might be a possibility.
Yes, combined with.. Low dose Naltrexone is an intriguing & promising immune modulator pioneered by the late bernard bihari md. While there is research showing it helps crohn's & other diseases, there are no studies done yet on cancer, though dr. Bihari reported cases where it seems to help. It is safe & affordable but i would not rely on it as one's only treatment. See http://lowdosenaltrexone.Org/ldn_and_cancer.Htm.