Researchers from Otago University at Christchurch have found that vitamin C has the potential to block tumor growth

“This is a mechanism that will apply to all solid tumours and there's even an indication it would apply to haematological tumours like, say, leukaemia,” Dr Visser told 3news New Zealand. “It will slow the growth rate of the tumour it will also make those cancer cells more likely to respond to chemotherapy and regular therapies.”
The details of the study are available in the journal Cancer Research.
Source-Medindia