High-dose intravenous vitamin C (intravenous ascorbic acid) was initially studied on its own, but later early-phase clinical trials also began to evaluate its use alongside standard cancer medicines.
In patients with metastatic pancreatic cancer, one Phase I study assessed the safety and feasibility of intravenous ascorbic acid given together with gemcitabine and erlotinib.
One important area of research into high-dose intravenous vitamin C (intravenous ascorbic acid) in cancer has been to determine whether pharmacological concentrations can be achieved safely in patients with advanced disease before exploring potential clinical value.
The main purpose of this Phase I study was not to prove that vitamin C could control cancer, but to evaluate the safety, tolerability, and pharmacokinetic characteristics of different intravenous doses.
When high-dose vitamin C is used in a medical setting, potential clinical effects are only one part of the picture. Renal metabolism and safety also require careful consideration.
Vitamin C can be metabolized into oxalate in the human body. When oxalate accumulates and combines with calcium to form calcium oxalate crystals, those crystals may, under certain circumstances, deposit within the renal tubules and contribute to kidney injury.
High-dose intravenous vitamin C, or intravenous ascorbate, differs from routine oral vitamin supplementation because intravenous administration can produce substantially higher blood concentrations of ascorbate.
One important question in early clinical research was what would happen when higher-dose ascorbate was given continuously to patients with advanced cancer, particularly in terms of safety, tolerability, and plasma concentration.
The relationship between high-dose ascorbate and survival in patients with advanced cancer attracted considerable attention in early clinical research.
One study revisited this question by comparing patients with advanced cancer who received supplemental ascorbate with matched patients who did not, aiming to determine whether the survival difference reported in earlier work could be reproduced in another patient group.
In 1976, Ewan Cameron and Linus Pauling published a study in Proceedings of the National Academy of Sciences of the United States of America examining whether supplemental high-dose ascorbate was associated with survival time in patients with advanced cancer.
The study extended Cameron’s earlier clinical observations on high-dose vitamin C and later became one of the most frequently cited early publications in the history of vitamin C and cancer research.
Research into high-dose vitamin C in cancer medicine is not a recent development. As early as 1974,
Cameron and Campbell published a clinical study involving patients with advanced cancer, which later
became one of the important early papers in this field.
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