BCG is first and foremost the world's most common tuberculosis vaccine, and was first used in humans all the way back in 1921. Made from a weakened strain of live bovine tuberculosis bacteria, it's been show to be up to 80 percent effective in preventing TB for a duration of 15 years.
As far back as 1979, a clinical trial declared that "BCG is beneficial in the treatment of lung cancer" (http://jjco.oxfordjournals.org/content/9/1/19.abstract). Then, in 1991, a study published in the new England Journal of Medicine suggested that the BCG vaccine offered strong protection against the recurrence of bladder cancer. (http://www.nejm.org/doi/full/10.1056/NEJM199110243251703#t=article+Conclusions)
There followed a 1994 trial which provided evidence that BCG increased survival time and reduced risk of recurrence in those suffering from malignant melanoma (http://lib.bioinfo.pl/pmid:16538310); reports that it was beneficial in the treatment of colorectal cancer (http://www.expert-reviews.com/doi/abs/10.1586/14760584.4.3.329); and, most recently, concrete examples of its beneficial effects in bladder cancer treatment(http://www.nejm.org/doi/full/10.1056/NEJM199110243251703). TB, dead. Four disparate types of cancer kept in check.
In 1999, it was demonstrated that BCG reduced the incidence of MS symptoms (http://www.ncbi.nlm.nih.gov/pubmed/10534275). A 2006 paper in the Lancet explained how BCG has a protective effect on leprosy (http://www.sciencedirect.com/science/article/pii/S1473309906704121). Several years ago, Harvard professor Denise Faustman showed that BCG could be used to treat diabetes in mice (http://www.dailymail.co.uk/health/article-534410/Human-trials-begin-diabetes-cure-terminally-ill-mice-returned-health.html).
source : http://gizmodo.com/5934555/the-miracle-cure-thats-hiding-in-plain-sight
