The combo of vitamin C and Vitamin K3 being used to kill cancer cells in breast cancer, prostate cancer, bladder cancer, etc, etc,. Human clinical trials have been underway in several areas.
The study below is about bladder cancer.

Journal of Cancer Science & Therapy [2013, 5:325-333]……
Vitamin C and Vitamin K3 Combination Causes Enhanced Anticancer Activity against RT-4 Bladder Cancer Cells
James M. Jamison, Ph.D
St. Thomas Hospital
444 N. Main Street, Akron, Ohio 44310, US

“……Henryk Taper and coworkers for the treatment of liver and other cancers by using a combination of vitamin C and vitamin K3 (VC:VK3) in a 100:1 ratio. Taper showed that vitamin C reactivated DNase II, while vitamin K3 reactivated DNase I with the combination synergistically causing tumor cell death.”
“These results have been extended into the clinical setting with a phase I/IIa clinical trial for end stage prostate cancer which demonstrated both safety and efficacy.”

“Vitamin C, Vitamin K3 and the combination were evaluated against human bladder cancer cell lines RT-4 and T24 to evaluate their synergistic anticancer activity.”

“….combination Vitamin C and vitamin K3 was able to cause autoschizic cell death through oxidative stress, thiol depletion, lipid peroxidation, modification of ATP levels and calcium regulation.”

“Because of these results, combination Vitamin C and vitamin K3 was granted orphan drug status for the treatment of metastatic or locally advanced, inoperable transitional cell carcinoma of the urothelium (stage III and IV bladder cancer).”
“Efforts are underway to conduct a phase II clinical trial for this indication.”