Life Extension Magazine November 2010
The Remarkable Anticancer Properties of Vitamin K
By Felix DiFara
By Felix DiFara
For most of mankind’s existence, scientists wallowed in lethal ignorance regarding the critical need for humans to supplement with enough vitamin D.
We fear the same knowledge deficit exists today regarding vitamin K.
In this article, you will discover remarkable findings on vitamin K and its rapidly emerging anti-cancer profile. You’ll learn of newly identified mechanisms by which vitamin K exerts its potent effects. You will also understand why interest is growing among scientists and even some mainstream physicians about vitamin K’s role in combating cancer at multiple stages.
Vitamin K: A New Frontier in Cancer Prevention
Vitamin K2 (menaquinone) has been shown to safely suppress growth and invasion of human hepatocellular carcinoma, a common and deadly form of liver cancer.1,2 It exerts multiple effects on these tumors, modifying growth factors and their receptor molecules in a way that makes them less able to stimulate tumor growth and progression.2-4 It freezes the cell cycle, blocking further replication.5 And it triggers programmed cell death by apoptosis through several distinctive mechanisms.6
Lab studies demonstrate tremendous potential for vitamin K in many other cancer types as well.7 Vitamin K2 induces certain kinds of human leukemia cells to differentiate, or turn into normal white blood cells.8 In cells from certain brain tumors, in stomach cancer, and in colorectal cancer lines, vitamin K halts the reproductive cell cycle and induces apoptosis.9-11 Vitamin K also triggers a DNA-degrading protein that cancer cells normally suppress; thereby preventing tumor cells from repairing themselves effectively.12
Lung cancers are notoriously aggressive and difficult to treat. In several different types of lung cancer, including small cell, squamous cell, and adenocarcinomas, vitamin K induces apoptosis through activation of a “suicide protein.”13 Clinical trials of newer chemotherapy agents have been disappointing, but when vitamin K was added to one newer drug, imatinib mesylate, it rapidly suppressed growth in all lung cancer cell lines tested.14 Vitamin K exhibits similarly synergistic effects in bladder and liver cancers as well.15,16
A unique mechanism of vitamin K’s activity is so-called “oncosis,” a form of stress-activated ischemic cell death to which tumor cells are particularly susceptible.17 Because of their high growth rate, tumor cells consume vast amounts of glucose. And because they can rapidly outgrow their blood supplies, that high metabolism means they use up oxygen rapidly, making them especially vulnerable to oxidant stress—much more so than the healthy tissues around them. Vitamin K targets tumor cells for destruction by stimulating oxidative stress, without toxicity to healthy tissues.18
Another unique mechanism, demonstrated recently in bile duct cancers and leukemia, is autophagy, in which cancer cells essentially “eat” themselves by releasing their own digestive enzymes internally.19,20 By still another unique mechanism, vitamins C and K in combination contribute to cancer cell death by autoschizis, whereby cells simply split open, spilling their contents.21
Finally, three of vitamin K’s synergistic anticancer mechanisms have recently been identified. Vitamin K3 inhibits DNA-building enzymes.22 Vitamins K2 and K3 block new blood vessel formation essential to support the rapid growth of tumor tissue.22-24 And vitamin K3 disrupts crucial intracellular communications networks composed of microtubules, preventing the cells from proliferating in a coordinated fashion.25
Liver and Prostate Cancer: Improving Survival Rates
Vitamin K’s promise in managing a variety of advanced solid tumors has been established in vitro and in animal studies, with benefits shown in lung cancers but not in gastrointestinal cancers, when combined with traditional chemotherapy.26,27 Other studies had already demonstrated that massive doses of vitamin K2, up to more than 2.5 grams given IV per day, were safe and caused no enhancement of the chemotherapy toxicity.28
Additional positive findings came in the form of two case reports, also from Japan. In the first, a 72 year-old woman with leukemia who had failed standard therapy experienced complete remission after vitamin K2 was added to her therapeutic regimen.29 In the second, an 85 year-old man with hepatocellular carcinoma after hepatitis C infection chose to take vitamin K but no chemotherapy.30 His tumor markedly regressed by CT scan, and his tumor markers in blood all normalized.
A study from Uruguay demonstrated that serum markers in a group of prostate cancer patients indicated tumor cell destruction following supplementation with vitamins C and K.31
Recently published studies have revealed vitamin K’s power to reduce recurrence of liver cancer—extending and even saving lives. The first reported on 61 patients documented to be free of their cancers following surgical treatment. Thirty-two were assigned to receive a vitamin K2 analogue called menatetrenone, while 29 received placebo.32 The supplemented group had recurrence of tumors of 12.5% at 12 months, 39.0% at 24 months, and 64.3% at 36 months. In the control group the recurrence rates were significantly higher: 55.2%, 83.2%, and 91.6%, respectively. And 100% of the supplemented group survived a full year, with 87% still alive at 36 months; among controls those numbers were 96.4% and a dismal 64%, respectively.
In a smaller study with 45 patients,33 rates of recurrence were only 33.3% in patients treated with vitamin K compared with 50% in controls. And survival rates tended to be modestly higher in treated patients.
A 2007 study provided some additional support, showing a significant reduction in tumor recurrence, but not survival rates, over a 3-year period in supplemented patients.34 More studies are needed.
Vitamin K2 also induces MDS cells to differentiate into healthy white blood cells
Studies of combination therapies have now provided strong evidence favoring vitamin K2 both in liver and prostate cancer. A group of US urologists studied the combination of vitamin K3, 50 mg per day, plus vitamin C at 5,000 mg per day in treating prostate cancer patients who had failed standard therapy.35 They showed that treatment significantly decreased the velocity of rise in PSA, the serum marker of disease, while increasing the time it took for PSA levels to double. And only one patient in this group of advanced cancer patients died in the 14 months of treatment. This finding demonstrates vitamin K’s disease-fighting credentials in a particularly compelling fashion, when combined with another readily available supplement.
The combination of vitamin K2 plus a drug in the ACE-inhibitor category (both of which reduce tumor blood vessel growth) also produced a marked decrease in recurrence of hepatocellular carcinoma.36 The same research group showed that they could use that combination to stop a precancerous nodule from developing into liver cancer in a patient with hepatitis C-related cirrhosis.37
Vitamin K2 in Action: The Case of Myelodysplastic Syndrome
“Myelodysplastic syndrome” (MDS) is a disorder related to leukemia; in fact it was formerly known as “pre-leukemia.”38,39 In patients with MDS, the bone marrow begins churning out increasingly young white blood cells of various kinds. In most cases it goes on to full-blown leukemia, with all of the disastrous consequences of that disease. But unlike leukemia, MDS cells, at least early on, can be induced to develop into mature normal blood cells.39,40 And that’s where vitamin K comes in.
Vitamin K treatment of bone marrow cells from MDS patients potently induces apoptosis (programmed cell death) of the leukemic cells, with the effect much more prominent on blast cells than on mature white cells.41,42 Vitamin K2 also induces MDS cells to differentiate into healthy white blood cells, even when full-blown leukemia has developed.43
Successful therapy of MDS with vitamin K2 was first reported in 1999, in an 80-year-old woman with persistent anemia from the disease. Prior to treatment she had required regular blood transfusions; 14 months later she was independent of them.44 Similar benefits were found in a small group of MDS patients with refractory anemia in 2002.45 And some improvements were also found in MDS patients with low white blood counts compared with those receiving no treatment.46
The combination of vitamin K2 with vitamin D3 achieved good differentiation in a lab study of leukemia cells, suggesting that it might be effective therapy for both MDS and leukemia.47 In a clinical study in mid-2010, the addition of vitamin D3 to vitamin K2 more than doubled the response rate of MDS patients with refractory anemia and low white blood counts, from 13% to 30%. Those are big numbers for conditions traditionally difficult to treat with standard chemotherapy!48
Cancer remains a deadly threat for millions of aging Americans, despite decades of aggressive research. Standard cancer medications can only help after a cancer is discovered, and even then they are limited by toxicity. Standard cancer treatments attack only one or a few biochemical steps in the long cascade of events leading to tumor development.
Long associated only with blood clotting, vitamin K is now known to have effects on tissues throughout the body, including most of the steps leading up to cancer. Recent discoveries about vitamin K illustrate the tremendous breadth of its targets, spanning virtually every phase in cancer’s deadly progress. A solid base of laboratory science is complemented by compelling clinical evidence that vitamin K can prevent, and in some cases treat, a variety of common and dangerous cancers.
If you have any questions on the scientific content of this article, please call a Life Extension® Health Advisor at 1-866-864-3027.
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