Intravenous VITAMIN C Trial for cancer were conducted by Linus Pauling (Nobel Laureate) but never given credence by medical community. Medical community gave credence to the trial conducted by Mayo Clinic in which Vitamin C was given orally and hence they were not able to replicate the results
All in all there are a number of cases were cancer has been cured with IV Vitamin C. Trials need to be conducted. No pharma company will because it is a very inexpensive treatment and cancer is very profitable.