Conclusions: High-dose i.v. ascorbic acid was well tolerated but failed to demonstrate anticancer activity when administered to patients with previously treated advanced malignancies.
https://academic.oup.com/annonc/article/19/11/1969/199216/Phase-I-clinical-trial-of-i-v-ascorbic-acid-in#1995524
Do you see any flaws in this study ?