VITAMIN A : Cancer Cure or Cancer Cause?

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FOR IMMEDIATE RELEASE

Orthomolecular Medicine News Service, August 20, 2008

VITAMIN A : Cancer Cure or Cancer Cause?

Media Tells a One-Sided Story

(OMNS, August 20, 2008) Vitamin A " pushes, " " promotes, " and even " incites "

cancer growth, say the headlines! Is this yet another instance of vitamin

bashing, or are you supplement-takers killing yourselves? Let's take a look.

A few researchers are claiming that vitamin A, in a test-tube experiment,

will " push " stem cells to change into cells that can build blood vessels. This,

they say, may increase cancer. So when " structures similar to blood vessels

developed within the tumor masses grown in culture, " they concluded that

vitamin A promotes carcinogenesis. (1) That is a bit of a leap. An in vitro

(test-tube) project is far from clinical proof. Even the study authors admit

" vitamin A is known to be necessary for embryonic development precisely because

it

helps to 'differentiate' stem cells, pushing them to become required

tissue. "

There is an anti-cancer drug that specifically acts by blocking the

breakdown of retinoic acid, derived from vitamin A. This approach has been

found to

be " surprisingly effective in treating animal models of human prostate cancer.

.. . Daily injections of the agent VN/14-1 resulted in up to a 50 percent

decrease in tumor volume in mice implanted with human prostate cancer cells. .

..

No further tumor growth was seen during the five-week study. " (2) It seems

that when cancerous tumors have more vitamin A available, they shrink. And

there is a good reason tumors shrink. " Keeping more retinoic acid available

within cancer cells. . . redirects these cells back into their normal growth

patterns, which includes programmed cell death. . . This potent agent causes

cancer cells to differentiate, forcing them to turn back to a non-cancerous

state. " So vitamin A seems to induce positive, healthy, cell changes. Indeed,

this

is why vitamin A derivatives are already in wide use to fight skin cancer.

Vitamin A fights cancer. It does not " push, " " promote, " or " incite " it.

Sensational warnings and outright misstatements that natural vitamin A may

" incite " cancer actually serve to incite newspaper readers and television

viewers. Upon closer examination, a " vitamin promotes cancer " study often has

the

appearance of being conducted to prove an intended point. As the authors

fuel fears about vitamin A, they also give away their goal, in their own words

stating that " these findings open a new door to drug development. " New

marketing avenues for the development of patentable vitamin A-like drugs are a

commercial opportunity that the pharmaceutical industry has not overlooked.

A vitamin A derivative " could protect against lung cancer development in

former smokers, " says another report. (3) Significantly, the vitamin A

derivative is used " combined with alpha-tocopherol (vitamin E), in order to

reduce

toxicity known to be associated with 13-cis-RA (the vitamin A derivative)

therapy. " This illustrates why orthomolecular (nutritional) physicians do not

use

high doses of vitamin A by itself, but rather give it in context with other

important, synergistic nutrients. A baseball team entirely made up of pitchers

might get a lot of strikeouts while in the field, but not hit many home runs

when at bat. All nutrients are needed in a living body. Vitamin A is an

essential part of the team.

Here is an example: " A study published in the Journal of Nutritional

Biochemistry found that administering both vitamin A and vitamin C to cultured

human

breast cancer cells was more than three times as effective than the

administration of either compound alone (since) the combination of the two

vitamins

inhibited proliferation by 75.7 percent compared to untreated cells. . . The

ability of retinoic acid (vitamin A) to inhibit tumor cell proliferation is

well known, although its mechanism has not been defined. The authors suggest

that the synergistic effect observed in this study is due to ascorbic acid's ab

ility to slow the degradation of retinoic acid, thereby increasing vitamin

A's cell proliferation inhibitory effects. " (4) Vitamin C helps vitamin A do

its work even better, a clear team advantage.

Doctors' experience and clinical evidence both show that vitamin A helps

prevent cancer. This has been known for a long time. " The association of

vitamin

A and cancer was initially reported in 1926 when rats, fed a vitamin

A-deficient diet, developed gastric carcinomas. . . The first investigation

showing

a relationship between vitamin A and human cancer was performed in 1941 by

Abelsetal who found low plasma vitamin A levels in patients with

gastrointestinal cancer. " (5) Moon et al reported daily supplemental doses of

25,000 IU of

vitamin A prevented squamous cell carcinoma. And, de Klerk and colleagues

reported " findings of significantly lower rates of mesothelioma among subjects

assigned to retinol. . . Studies that use animal models have shown that

retinoids (including vitamin A) can act in the promotion-progression phase of

carcinogenesis and block the development of invasive carcinoma at several

epithelial sites, including the head and neck and lung. " (5) The Linus Pauling

Institute adds, " Studies in cell culture and animal models have documented the

capacity for natural and synthetic retinoids to reduce carcinogenesis

significantly in skin, breast, liver, colon, prostate, and other sites. " (6).

National data from the American Association of Poison Control Centers

repeatedly fails to show even one death from vitamin A per year. (7) Vitamin A

is

very safe. However, pregnancy is a special case where prolonged intake of too

much preformed oil-form vitamin A might be harmful to the fetus, even at

relatively low levels (under 20,000 IU/day). Interestingly enough, you can get

over 100,000 IU of vitamin A from eating only seven ounces of beef liver. Have

you ever yet seen a pregnancy overdose warning on a supermarket package of

liver?

A lack of vitamin A, especially during pregnancy, and in infancy, poses far

greater risks. Deficiency of vitamin A in developing babies is known to cause

birth defects, poor tooth enamel, a weakened immune system, and literally

hundreds of thousands of cases of blindness per year worldwide. This is why

developing countries safely give megadoses of vitamin A to newborns to prevent

infant deaths and disease. (8)

There will always be people bent on believing that vitamins must be harmful,

somehow. For them, it only remains to set up some test-tubes to try to prove

it. Such has been done with other vitamins, perhaps most notably a famous if

silly experiment that claimed that vitamin C promoted cancer. The study,

reported in New Scientist, 22 September 2001, was a prime example of sketchy

science carelessly reported. The article would have readers uncritically extend

the questionable findings of a highly artificial, electrical-current-vibrated

quartz crystal test tube study, and conclude that 2,000 milligrams of

vitamin C can (somehow) do some sort of mischief to human DNA in real life. If

two

thousand milligrams of vitamin C were harmful, the entire animal kingdom

would be dead. Our nearest primate relatives all eat well in excess of 2,000 mg

of vitamin C each day. And, pound for pound, most animals actually manufacture

from 2,000 to 10,000 mg of vitamin C daily, right inside their bodies. If

such generous quantities of vitamin C were harmful, evolution would have had

millions of years to select against it. Same with vitamin A. If it " promoted "

cancer, every animal eating it would get cancer.

They don't, of course. And, if we consume enough vitamin A, perhaps neither

do we. The NIH says, " Dietary intake studies suggest an association between

diets rich in beta-carotene and vitamin A and a lower risk of many types of

cancer. A higher intake of green and yellow vegetables or other food sources of

beta carotene and/or vitamin A may decrease the risk of lung cancer. " (9) A

study of over 82,000 people showed that high intakes of vitamin A reduce the

risk of stomach cancer by one-half. (10) Dr. Jennifer Brett comments that

" Vitamin A fights cancer by inhibiting the production of DNA in cancerous

cells.

It slows down tumor growth in established cancers and may keep leukemia

cells from dividing. " (11) A derivative of the vitamin has been shown to kill

CEM-C7 human T lymphoblastoid leukemia cells and P1798-C7 murine T lymphoma

cells. (12)

Vitamin A is very far from being a cancer " promoter. " Rather, it is very

near to the cancer solution.

References:

(1) Vitamin A Pushes Breast Cancer to Form Blood Vessel Cells. ScienceDaily,

July 17, 2008.

_http://www.sciencedaily.com/releases/2008/07/080715204719.htm_

(http://www.orthomolecular.org/12all/lt/t_go.php?i=88 & e=MjY2MDA= & l=http://www.sc\

iencedaily.com/releases/2008/07/080715204719.htm)

 

(2) Drug Slows Prostate Tumor Growth by Keeping Vitamin A Active. November

6, 2007. Findings from the AACR Centennial Conference on Translational Cancer

Medicine: From Technology to Treatment, Singapore, November 4-8, 2007

_http://www.aacr.org/home/public--media/news/news-archives-2007.aspx?d=922_

(http://www.orthomolecular.org/12all/lt/t_go.php?i=88 & e=MjY2MDA= & l=http://www.aa\

cr.org/h

ome/public--media/news/news-archives-2007.aspx--Q-d--E-922)

 

(3) Vitamin A derivative could restore smokers' health.

_http://www.in-pharmatechnologist.com/news/ng.asp?id=26231-vitamin-a-derivative_

(http://www.orthomolecular.org/12all/lt/t_go.php?i=88 & e=MjY2MDA= & l=http://www.in\

-pharmatechnologi

st.com/news/ng.asp--Q-id--E-26231-vitamin-a-derivative)

 

(4) _http://www.lef.org/whatshot/2006_05.htm_

(http://www.orthomolecular.org/12all/lt/t_go.php?i=88 & e=MjY2MDA= & l=http://www.le\

f.org/whatshot/2006_05.htm)

.. See also: Kim KN, Pie JE, Park JH, Park YH, Kim HW, Kim MK. Retinoic acid

and ascorbic acid act synergistically in inhibiting human breast cancer cell

proliferation. J Nutr Biochem. 2006 Jul;17(7):454-62. Epub 2005 Nov 15.

 

(5)

_http://www.bccancer.bc.ca/PPI/UnconventionalTherapies/VitaminARetinol.htm_

(http://www.orthomolecular.org/12all/lt/t_go.php?i=88 & e=MjY2MDA= & l=http://www.bc\

cancer.bc.ca/PPI/UnconventionalTherapies/VitaminARetinol.htm)

 

(6) _http://lpi.oregonstate.edu/infocenter/vitamins/vitaminA/_

(http://www.orthomolecular.org/12all/lt/t_go.php?i=88 & e=MjY2MDA= & l=http://lpi.or\

egonstate.edu

/infocenter/vitamins/vitaminA/)

 

(7) Annual Reports of the American Association of Poison Control Centers'

National Poisoning and Exposure Database (formerly known as the Toxic Exposure

Surveillance System). AAPCC, 3201 New Mexico Avenue, Ste. 330, Washington, DC

20016. Download any report from1983-2006 at

_http://www.aapcc.org/dnn/NPDS/AnnualReports/tabid/125/Default.aspx_

(http://www.orthomolecular.org/12all/lt/t_go.php?i=88 & e=MjY2MDA= & l=http://www.aa\

pcc.org/dnn/NPDS/AnnualReports/tabid/125/

Default.aspx) free of charge. The " Vitamin " category is usually near the

end of the report.

 

(8) Basu S, Sengupta B, Paladhi PK. Single megadose vitamin A

supplementation of Indian mothers and morbidity in breastfed young infants.

Postgrad Med J.

2003 Jul;79(933):397-402. And: Rahmathullah L, Tielsch JM, Thulasiraj RD et

al. Impact of supplementing newborn infants with vitamin A on early infant

mortality: community based randomized trial in southern India. BMJ. 2003 Aug

2;327(7409):254.)

 

(9) _http://ods.od.nih.gov/factsheets/vitamina.asp_

(http://www.orthomolecular.org/12all/lt/t_go.php?i=88 & e=MjY2MDA= & l=http://ods.od\

..nih.gov/factsheets/vita

mina.asp)

 

(10) Larsson SC, Bergkvist L, Nlund I, Rutegd J, Wolk A. Vitamin A, retinol,

and carotenoids and the risk of gastric cancer: a prospective cohort study.

Am J Clin Nutr. 2007 Feb;85(2):497-503.

 

(11) Brett, N.D., Jennifer. " How Vitamin A Works. " 20 December 2006.

HowStuffWorks.com. _http://recipes.howstuffworks.com/vitamin-a.htm_

(http://www.orthomolecular.org/12all/lt/t_go.php?i=88 & e=MjY2MDA= & l=http://recipe\

s.howstuffworks.

com/vitamin-a.htm) .

 

(12) Chan LN, Zhang S, Shao J, Waikel R, Thompson EA, Chan TS.

N-(4-hydroxyphenyl)retinamide induces apoptosis in T lymphoma and T

lymphoblastoid

leukemia cells. Leuk Lymphoma. 1997 Apr;25(3-4):271-80.

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