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Tamoxifen - A Major Medical Mistake?


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Posted by: dg806

http://www.all-natural.com/tamox.html



Tamoxifen
A Major Medical Mistake?
by Sherrill Sellman
Extracted from Nexus Magazine, Volume 5, #4 (June - July 1998)
Once praised for its benefits in preventing breast cancer recurrence, the lucrative pharmaceutical drug tamoxifen is now implicated in causing dangerous side-effects, including other types of cancers.

In the early 1970's, a shameful chapter closed on the widespread use of a known carcinogenic and endocrine-disrupting drug called DES (diethylstilboestrol), the first synthetic, non-steroidal estrogen drug. Against the advice of its creator, Sir Charles Dodd, between four and six million American and European women and 10,000 Australian women innocently used DES for the prevention of miscarriage and pregnancy complications.

In addition, DES became a popular though unproven drug for a variety of other conditions. It was used for the suppression of lactation, the treatment of acne, the treatment of certain types of breast and prostatic cancer, and as an inhibitor of growth in young girls, an estrogen replacement in menopause and a "morning after" pill.

It would take 30 years to accept what laboratory tests had indicated as early as 1938 — that DES was a highly dangerous and harmful drug. It was reported that, 20 years after taking DES, mothers had a 40 to 50 per cent greater risk of breast cancer than non-exposed mothers. In addition, the children of DES mothers showed a high incidence of reproductive abnormalities, miscarriages, vaginal cancer, testicular cancer, sterility and immune dysfunction. In fact, it is feared that repercussions of this drug will be felt for generations to come.

The irony of this entire debacle is that the medical establishment finally acknowledged that DES was useless in preventing miscarriages. Thus, DES, another disastrous experiment on women, was added to the long list of major medical blunders.

Out of this early research, a new drug appeared on the horizon which would be soon be heralded as a shining star in the war against the growing epidemic of breast cancer. In the late 1960's the pharmaceutical industry developed a drug called "tamoxifen". As a synthetic, non-steroidal compound with hormone-like effects (many of which are poorly understood), tamoxifen has a similar structure to DES. In fact, it was observed that tamoxifen caused the same abnormal changes seen in cells of women taking estradiol and DES. (1) This similarity raised alarm bells for some.

Pierre Blais, well known as a drug researcher who was ejected from Canada's health protection bureaucracy when he spoke out about silicone breast implants, describes the story of tamoxifen as "the story of modern drug design which produces garbage drugs". He says, "Good drug design ceased, unfortunately, in the 1930s." Tamoxifen, Blais asserts, "...is a garbage drug that made it to the top of the scrap heap. It is a DES in the making." (2)

Blais's dire predictions were ignored with the promise of a potential drug treatment for breast cancer. Tamoxifen was first approved by the US Food and Drug Administration (FDA) for use as a birth-control pill; however, it proved to induce rather than inhibit ovulation. Although tamoxifen didn't work as a contraceptive, it was found to lower mammary cancer rates in animals. Animal studies showed that tamoxifen prevented estrogen from binding to receptor sites on breast tissue cells. Tamoxifen also reduced the incidence of breast cancer in rodents after administration of a breast-carcinogenic substance. This discovery provided the impetus to study its effects in treating human breast cancer.

Estrogen is the common link between most breast cancer risk factors, i.e., genetic, reproductive, dietary, lifestyle and environmental. It both stimulates the division of breast cells (healthy as well as cancerous) and, especially in its 'bad' form, increases the risk of breast cancer. Thus, hormonal drugs such as tamoxifen that block the effects of estrogen on the breast were expected to reduce the risk of breast cancer recurring in women treated for breast cancer. (3)

Tamoxifen acts as a weak estrogen by competing for estrogen receptors much as phyto-estrogens do. Like phyto-estrogens, tamoxifen has mild estrogenic properties but is considered an anti-estrogen since it inhibits the activity of regular estrogens. More accurately, tamoxifen is an estrogen-blocker. It fights breast cancer by competing with estrogen for space on estrogen receptors in the tumor tissue. Every tamoxifen molecule that hooks onto an estrogen receptor prevents an estrogen molecule from linking up at the same site. Without a steady supply of estrogen, cells in an estrogen-receptor-positive (ER+) tumor do not thrive and the tumor's ability to spread is reduced. (4)

However, tamoxifen exhibited two conflicting characteristics. It could act either as an anti-estrogen or as an estrogen. Therefore, while tamoxifen is anti-estrogenic to the breast, it also acts as an estrogen to the uterus and, to a lesser extent, the heart, blood vessels and bone. So, although it initially showed the tendency to counter breast cancer recurrence, it would soon be revealed that it also promoted particularly aggressive uterine and liver cancers, caused fatal blood clots and interfered with many other functions.

Doctors, however, were quick to jump on the tamoxifen bandwagon, turning a blind eye to its more injurious tendencies. Starting in the 1970's oncologists began using tamoxifen to treat women with cancer, often in combination with other drugs, radiation or surgery such as lumpectomy and mastectomy, with modest success. Like DES, tamoxifen's benefits were then extended for use as a preventive against osteoporosis and heart disease.

Today, doctors are treating about one million American breast cancer patients with tamoxifen, about 20 per cent of them for more than five years. As studies published in the New England Journal of Medicine in 1989 and the Journal of the National Cancer Institute in 1992 showed, women with breast cancer who took tamoxifen reduced their chances of developing cancer in the other breast (contralateral cancer) by about 30 to 50 per cent. (3) These findings would later be challenged.

Tamoxifen is now recommended for all pre-menopausal women with hormone-positive cancers, as well as for most postmenopausal women with breast cancer and/or a growing number of women with hormone-negative cancers. Tamoxifen is currently used by more women with breast cancer than any other drug. (6)

Tamoxifen (brand name Nolvadex) is now the most widely prescribed cancer medication in the world. It generated revenues of US $265 million in 1992. By 1995, worldwide sales of Nolvadex reached $400 million. (7) And at AUD $90 for one month's supply, it doesn't come cheap (the Australian Pharmaceutical Benefits Scheme covers $70).

Tamoxifen was developed by UK-based Imperial Chemical Industries (ICI), one of the world's largest multinational chemical corporations. Zeneca, an ICI subsidiary, is responsible for manufacturing and marketing the hormone and is now the world's largest cancer-drug company.

It is no surprise that ICI's profits come from playing both sides of the cancer industry. ICI's agrochemical division, which includes Zeneca, manufactures chlorinated and other industrial chemicals including herbicides. All are poisonous, and many are known endocrine-disrupters that have been incriminated as causes of breast cancer. ICI's profits swell by manufacturing chemicals that on the one hand cause breast cancer, and on the other hand reputedly cure breast cancer.


LIMITED BENEFITS OF TAMOXIFEN
Tamoxifen 's benefits are determined by several factors: (8)

Postmenopausal women who are ER-positive (have a positive estrogen receptor status) get the most benefit.
For postmenopausal women who are ER-negative, the benefits appear to outweigh the risks.
For pre-menopausal women who are ER-positive, it's a tough call. Potential benefits are small.
Pre-menopausal women who are ER negative receive virtually no benefit.
Tamoxifen is more effective in women who have cancer in their lymph nodes than in those whose nodes are cancer-free.

In 1992 the Lancet published a review of a number of studies in which a total of 30,000 breast cancer patients were randomly assigned either to take tamoxifen or not. The average patient in this collaborative study was followed up for between five and six years. Of the patients taking tamoxifen, 74.4 per cent survived, as compared with 70.9 per cent in the non-tamoxifen group — a less than impressive improvement.

The report found that the group helped most consisted of post-menopausal women with ER-positive status. The study went on to report that pre-menopausal women who are ER-negative had absolutely no benefit from taking tamoxifen. (9)

Despite tamoxifen's proven ability to reduce breast cancer recurrence in postmenopausal women, major studies have shown that tamoxifen reduces death from breast cancer only marginally. (10) The majority of women who take tamoxifen live no longer than women who do not take it. (11) Furthermore, some breast cancers learn how to use tamoxifen to stimulate their growth.

The benefits of tamoxifen are limited. Virtually all women who take it become resistant within five years. (12) A recent randomized controlled study showed that tamoxifen reached its maximum protective effect on breast tissue with women who took it for five years. Taking it for five more years didn't offer any more protection, and may actually have caused more cancers. In other words, after a while the breast cells become resistant to tamoxifen and actually start to be fed by it. (13)

This result surprised the researchers. According to Dr. Susan Love, author of Dr. Susan Love's Hormone Book: "This is a dramatic example of why you need good, long-term studies. If we had based all of our recommendations on the five-year data without doing further studies, we would have had women taking tamoxifen forever. So convinced were we that tamoxifen was a wonder drug that the only reason researchers did the later study at all was to prove it wrong. Luckily, we found out that we were wrong in time to prevent doing further damage. We have learned, not for the first time, that more isn't always better." (l4)


TAMOXIFEN'S DARK SIDE
While the initial findings of tamoxifen's role in breast cancer treatment seemed so promising, as with so many of the synthetic hormone drugs, further research presented grave concerns for its widespread use. In fact, the MIMS Annual lists 25 adverse reactions to tamoxifen: some of l these can be fatal.


Menopausal Symptoms
Tamoxifen often induces menopausal symptoms in menstruating women. About half of these women experience hot flushes. Fluid retention and weight I gain occur in about 25 per cent of l women and can be controlled by reducing the dose. Vaginal discharge and vaginal atrophy are additional symptoms. Some studies have also found l that pre-menopausal users are at risk of developing accelerated bone-mineral loss and osteoporosis.

Menstrual irregularities also occur in pre-menopausal women. Amenorrhea (absence of the menstrual cycle) often results and can be permanent.


Eye Damage
According to a 1978 study in Cancer Treatment Reports and another published in Cancer in 1992, about six per cent of women taking even low-dose tamoxifen suffer damage to the retina and corneal opacities and decreased visual acuity. Irreversible corneal and retinal changes can occur in those taking 20 mg. of tamoxifen twice a day (twice the usual dose). These changes may have no immediate effect on visual acuity, but may predispose the eyes to later problems including cataracts.


Blood Clots
Tamoxifen irritates the walls of the veins, and inflammation (a natural healing response to irritation) follows. The constant irritation and inflammation weakens the veins, causing bleeding, clotting, thrombophlebitis and, in the worst cases, obstruction of the blood vessels serving the lungs, which can be deadly and can occur with little warning. The incidence of thrombophlebitis in women using oral contraceptives is generally regarded as significant (1 in 2,000); however, with tamoxifen it's 30 times greater."

Several studies, including one reported to the FDA's Oncological Drugs Advisory Committee by the National Surgical Adjuvant Breast and Bowel Project in 1991, showed that the risk of developing life-threatening blood clots increases about seven times in women taking tamoxifen. (6)


Psychological Symptoms
Depression has been reported as a potential side-effect of tamoxifen in 30 per cent of women. Cases have been reported of an inability to concentrate.

It is important that patients observe their moods and mental states. If it is suspected at tamoxifen is causing depression or lack of concentration, it is suggested that a period of tamoxifen avoidance be considered.


Other Symptoms
Tamoxifen can trigger asthma attacks in some sensitive patients.

Changes to the vocal cords resulting in impairment of singing and speaking abilities are occasionally caused by tamoxifen.


CARCINOGENENIC EFFECTS
It wasn't long before laboratory studies showed that tamoxifen acted as a carcinogen. It has been found that tamoxifen binds tightly and irreversibly to DNA, the genetic blueprint of a cell, causing a cancerous mutation to take place. Even Australia's conservative National Health and Medical Research Council (NHMRC) warned that no amount of tamoxifen is safe when it comes to carcinogenic effects.

In California there is a law called "Proposition 65" that requires the state to publish and maintain a list of all known carcinogens. In May 1995, the state's Carcinogen Identification Committee voted unanimously to add tamoxifen to its list.

Following suit, in 1996 the World Health Organization formally designated tamoxifen a human carcinogen, grouping it with 70 other chemicals — about one quarter of them pharmaceuticals — that have received this dubious distinction.


Liver Cancer and Liver Disease
Tamoxifen is toxic to the liver, and there have been reports of acute hepatitis in patients treated with tamoxifen. Liver damage has occurred in every animal given tamoxifen. According to Gary Williams, medical director of the American Heart Foundation, tamoxifen has been shown in animal studies to be a "rip-roaring" liver carcinogen, inducing highly aggressive cancers in about 12 per cent of rats. (7)

The latest human studies show a six-fold increase in liver cancer among women taking tamoxifen for more than two years." Liver failure and tamoxifen-induced hepatitis, although rare, have been reported. Even Zeneca admits that tamoxifen is a liver carcinogen — while nevertheless aggressively promoting its use.


Uterine (Endometrial) Cancer
As early as 1967, ICI scientists noted that "tamoxifen persists for some days in the uterus". In rats, a tamoxifen metabolite (a breakdown compound almost similar in structure to the original) was found to influence the uterus to be more receptive to estrogen. (The more estrogen, the greater the chance of unnatural cell-division leading to cancer.) ICI also reported liver carcino-genicity of tamoxifen as well as both ovarian and testicular tumors in mice in its description of the drug in the standard Physicians Desk Reference.

Uterine growths such as polyps, tumors, endometrial thickenings and cancers occur in a significant number of women taking tamoxifen. One study detected abnormal endometrial cells in subjects the day after the first tablet was taken. (9) Pre-cancerous uterine and endometrial changes were seen in 10 per cent of the women taking tamoxifen in a recent study. The higher the dose of tamoxifen and the longer it is taken, the greater the risk of changes. Women taking the standard dose of 20 mg. for two years run a risk of uterine cancer that is 2 to 3 times greater than normal. After five years, the risk is 6 to 8 times greater. (20)

In February 1996 a review by the International Agency for Research on Cancer, composed of scientists from various countries, definitively concluded that "there is sufficient evidence to regard tamoxifen as a human carcinogen that increases a woman's risk of developing cancer of the endometrium, the inner lining of the uterus" (21)

A large Swedish study linking tamoxifen to uterine cancer forced Zeneca to send letters in April 1994 to 380,000 physicians across the USA, in defense of the drug. The Swedish researchers had studied 1,371 breast cancer patients who took 40 mg. per day for two to five years and found that there was a six-fold increase in uterine cancer among those patients who took tamoxifen when compared to 1,327 who did not. A second study involving patients who took 20 mg. per day (the recommended dose) also showed a marked increase in uterine cancers compared with the control group. (22)

When the news came out that breast cancer patients who took tamoxifen for five years or longer (the same regimen that seems to prevent recurrence) might have tripled their risk of uterine cancer, British cancer researcher Richard Peto, head of the cancer research unit at Oxford University, sought to dismiss it. If caught early, he said, endometrial cancer seldom kills, so "it's no big deal". That statement infuriated critics who noted that the treatment for uterine cancer is hysterectomy. Dr. Adriane Fugh-Berman, a leading women's health activist, angrily responded: "To some of us, it is a big deal to lose your uterus."

Shortly after Peto's flip dismissal of uterine cancers, researchers at the M. D. Anderson Cancer Center at Houston and at Yale University School of Medicine discovered that breast cancer patients who develop uterine cancer while using tamoxifen are likely to have a fast-moving, lethal form of the disease. (23)

It should be noted that tamoxifen has also been associated with gastrointestinal cancers.


Breast Cancer
The premise for taking tamoxifen is its supposed role in protecting breast cancer patients from recurrence of the cancer. It was further postulated that it prevented breast cancer from occurring in the opposite breast (contralateral).

However, disturbing findings continue to surface, challenging tamoxifen's effectiveness. In 1992 the New England Journal of Medicine showed that tamoxifen may reduce the incidence of contralateral cancer, but this was demonstrated only in pre-menopausal women and only in three out of eight trials. In another 1992 study, reported in Octa Oncologica, it was shown that tamoxifen not only failed to reduce contralateral cancers in pre-menopausal women, but it actually increased their incidence. (24)

The irony of tamoxifen is that, while widely publicized as the leading treatment against the recurrence of breast cancer, it is a known and listed carcinogenic substance.


Heart Disease and Osteoporosis
Another promise of tamoxifen was its supposed protective benefits for the heart and bones. It was theorized that its estrogenic properties would help reduce heart disease and osteoporosis in women, but once again the theory crumbled under the weight of hard facts.

Several trials with tamoxifen failed to show that it has any effect on bone density and thus on prevention of osteoporosis. In three other trials, bone density increased slightly in lower spinal vertebrae but not in longer bones or hip bones which are particularly susceptible to fractures and potentially fatal complications.

Initial data seemed to indicate that it decreased the incidence of heart attacks, but they have been disproved by more recent studies. According to Dr. Susan Love: "It doesn't seem to have a bad effect on lipids, but that's a far cry from preventing heart attacks."

A detailed review of the drug's alleged protective cardiovascular effects prompted the British National Heart, Lung and Blood Institute, a once strong proponent of tamoxifen, to withdraw its support because the evidence of benefit proved so inadequate. (25)

According to the January 1996 issue of The Network News, it was reported at a closed-door meeting of the National Cancer Institute that tamoxifen failed to prevent heart disease in breast cancer patients.


THE BREAST CANCER PREVENTION TRIAL
Based far more on wishful thinking than on science, the U.S. National Cancer Institute (NCI) leaped to the conclusion that tamoxifen's anti-estrogenic effects in relation to breast cancer treatment meant that the drug would prevent breast cancer from developing in healthy women.

Disregarding all the research implicating tamoxifen with serious and potentially fatal side-effects, the NCI launched a US$60 million breast cancer prevention trial in April 1992, aiming to recruit 16,000 healthy women in the United States, Europe, Canada, Australia and New Zealand. Still ongoing, the trial now involves 13,000 healthy women over the age of 35 who are considered at high risk. Australia has recruited 1,350 women, with a target of 2,500. For five years, half the women receive tamoxifen and half receive a placebo. The drug is supplied free of charge by manufacturer Zeneca.

Dr. Samuel Epstein, Professor Environmental Medicine at the University of Illinois School of Public Health and author of The Breast Cancer Prevention Program, raises serious concerns. "Unfortunately, this misguided and dangerous approach to prevention stems from the entrenched fixation of the NCI on the use of chemical drugs to prevent cancer which may have been induced by chemical pollutants, medical technology (such as radiation from X-rays) and carcinogenic/estrogenic drugs in the first place. Instead of attempting to reduce the carcinogenic chemical burden under which we struggle to maintain our health, the NCI believes that the solution is to add more chemicals to the mix."

Dr. Susan Love concurs: "It is a sad state of affairs when we have to add yet more chemicals to counteract the effects of other chemicals."

This attitude extends to the way the NCI treats the women in the trial. They are given no guidance on alternative protective measures such as increasing exercise, maintaining a healthy weight, eating a protective diet and avoiding exposure to environmental carcinogens; nor are they being fully informed about the serious risks of tamoxifen.

Dr. Lynette Dumble, Senior Research Fellow in History and Philosophy of Science at the University of Melbourne, believes that the global trial to prevent breast cancer with tamoxifen is a modern and very large chapter of "medical imperialism". Back in October 1994 she commented on ABC TV's Quantum science program that the tamoxifen trial was the medical equivalent of mutilating surgery which prevents a woman from developing breast cancer by cutting off both her breasts.

Dr. Dumble sees women as vulnerable guinea pigs for the trial, and questions both the breast cancer risk of healthy women volunteering for the trial (how can you tell whether fate or tamoxifen prevents a woman from developing breast cancer?) and the terms of the trial's positives and negatives (if a woman dies of tamoxifen-related endometrial or liver cancer, does this count as a tamoxifen success in preventing breast cancer?).

It seems absurd, but why would the powers-that-be continue to promote a trial that promises to substitute one cancer for another in otherwise healthy women? Once again, healthy women are targeted as the guinea pigs for a drug treatment that has already been proven to be a cause of a variety of cancers including breast cancer. In the case of tamoxifen, medical research has once again taken a back seat to profits. It is the population that is at risk. The cancer establishment would certainly be eager to prove a tamoxifen-prevention role, since it would then open up another huge, billion-dollar market.


ALTERNATIVES TO TAMOXIFEN
While the cancer establishment continues to invest vast amounts of money into research, manufacturing and trialling of harmful drugs for the prevention and hopeful cure of breast cancer, there are safer and more effective options that already exist.

Estriol, one of the estrogens produced by the ovaries, is considered a safe estrogen in that it has been shown to inhibit breast cancer. Dr. Henry Lemon and his colleagues conducted a study in women who already had breast cancer that had spread to other areas of the body. One group was given Estriol and another not. At the end of the study, 37 per cent of those women who received estriol had either a remission or an arrest of their cancer. Might not estriol, a natural, safe hormone with almost no side-effects, be able to accomplish what tamoxifen does but without the toxic side-effects?

There is also convincing evidence that natural progesterone has an important role in breast cancer treatment and prevention. A study conducted in 1981 at Johns Hopkins University revealed that when a group with a low progesterone level was compared with a normal-level progesterone group, it was found that the occurrence of breast cancer was 5.4 times greater in the women in the low progesterone group. That is, the incidence of breast cancer in the low progesterone group was over 80 per cent greater than in the normal progesterone group. When the researchers looked at the low progesterone group for all types of cancer, they found that these women experienced a tenfold increase in all malignant cancers, compared to the normal group.

In a 1995 study published in the Journal of Fertility and Sterility, researchers found that women using a topical progesterone cream had dramatically reduced breast cell multiplication rates compared to women using either a placebo or estrogen. This exciting study demonstrated that natural progesterone creams impressively decreased breast cell proliferation rates. (27)

Lifestyle factors also play a significant role. In a prospective study of 25,624 Norwegian women aged 20 to 54, after an average of 14 years of follow-up the investigators found strong evidence that everyday exercise, both at work and at leisure, reduced the breast cancer risk. Women who exercised at least four hours a week during leisure time were found to have a 37 per cent reduction in risk of breast cancer, compared with sedentary women. The study found that the more time spent exercising, the lower the breast cancer risk. (28)

As Dr. John Lee pointed out in his best-selling book, What Doctors May Not Tell You About Menopause: "Herbs and food contain phyto-estrogens. Their benefit parallels that of tamoxifen (without the adverse side-effects) in that phyto-estrogens occupy estrogen receptors and are less estrogenic than those made by the body. Since it is now known that reducing caloric intake reduces estrogen levels, and recent studies find 46 per cent less breast cancer among women consuming more fruit and vegetables, it would seem that women interested in preventing breast cancer could make modest changes in diet and derive better and certainly safer results." (29)

History continues to repeat itself. Time and time again women have been reassured that the wonder drugs or treatments offered them would be their salvation, only to discover they were exposed to harmful carcinogenic and mutagenic chemicals.

In addition to the DES debacle, the disasters of thalidomide, silicone breast implants, estrogen replacement therapy and now tamoxifen (to name just a few) continue to demonstrate how readily women's lives have been sacrificed in the pursuit of profits. The warnings have been drowned out by the glossy advertising campaigns and the reassurances of "medical experts".

There are solutions to the breast cancer epidemic. However, they will be found more by altering lifestyle, dietary and stress factors, and reducing or eliminating exposure to the many known toxic, carcinogenic chemicals that are polluting the environment, than by some miraculous drug discovery. It is also up to women not only to continue to become fully educated about safe health options but to demand them from health providers. Too many women have already been maimed and sacrificed to unproven and unsafe drug treatments.

It is widely believed that today's drugs are tomorrow's poisons. In the case of tamoxifen, tomorrow has already arrived.


Posted by: dg806

More.................

http://www.innerself.com/Health/tamoxifen.htm

Beware of the Dark Side of
Tamoxifen (Nolvadex)
by Sherrill Sellman



There has been much ado in the press recently about the wonders of the drug tamoxifen (nolvadex). It has been heralded as a major breakthrough in the treatment and possible prevention of breast cancer. Tamoxifen is now the number one recommended drug treatment for women recovering from breast cancer. With half a billion dollars (US) in annual revenues1, it is currently used by more women with breast cancer than any other prescription drug.2

But as is the case with all pharmaceutical drugs, there are serious dangers which seem to be conveniently glossed over. Far from the savior of women's lives, it has potential lethal side-effects.

Despite tamoxifen's supposed ability to reduce recurrence in postmenopausal women, major studies have shown that tamoxifen reduces death from breast cancer only marginally.3, 4 The majority of women who take tamoxifen live no longer than women who refuse it.5 It is with great alarm that researchers are finding that some breast cancers actually learn how to use tamoxifen to stimulate their growth.6

While the initial findings of tamoxifen's role in breast cancer treatment seemed so promising, further research presented grave concerns for its widespread use. In fact the Physicians Desk Reference lists 25 adverse reactions to tamoxifen. Some can be fatal.

Menopausal Symptoms
Tamoxifen often induces menopausal symptoms in young women. About half of the women experience hot flashes, fluid retention, weight gain, vaginal discharge, and vaginal atrophy. Some studies have also found that premenopausal users are at risk of developing accelerated bone mineral loss and osteoporosis. Menstrual irregularities also occur in premenopausal women. Amenorrhea ( absence of the menstrual cycle) often results and can be permanent.

Eye Damage
Women using tamoxifen have experienced damaged retinas, increased corneal opacities, and decreased visual acuity. Irreversible corneal and retinal changes can also occur. These changes may predispose the eyes to later problems including cataracts.

Blood Clots
Tamoxifen irritates the walls of the veins. The constant irritation and inflammation weakens the veins causing bleeding, clotting, thrombophlebitis, and in the worst cases -- obstruction of the blood vessels serving the lungs which can be deadly and occur with little warning.7 Several studies showed that the risk of developing life-threatening blood clots increased as much as seven times in women taking tamoxifen.8

Psychological Symptoms
Depression has been reported as a potential side-effect of tamoxifen in 30% of women. Cases have been reported of an inability to concentrate.

Asthma
Tamoxifen can trigger asthma attacks in some sensitive patients.

Vocal Cord Changes
Tamoxifen can also cause changes to the vocal cords resulting in impairment of singing and speaking abilities.

Liver Cancer and Liver Disease
Tamoxifen is toxic to the liver and can cause acute hepatitis. The latest human studies show a six-fold increase in liver cancer among women taking tamoxifen for more than 2 years.9 Liver failure and tamoxifen-induced hepatitis, although rare, have been reported. While Zeneca, the manufacturer of tamoxifen admits that it is a liver carcinogen, it still continues to aggressively promote its use.

Uterine (Endometrial) Cancer
Uterine growths such as polyps, tumors, endometrial thickenings and cancers occur in a significant number of women. One study detected abnormal endometrial cells in subjects the day after the first tablet was taken!10

In a recent study, precancerous uterine and endometrial changes were seen in 10% of the women taking tamoxifen. The higher the dose of tamoxifen, and the longer it is taken, the greater the risk of changes. Women taking the standard dose for two years run the risk of uterine cancer that is 2 to 3 times greater than normal. After five years the risk is 6 to 8 times greater than normal.11

In February 1996 a review composed of scientists from various countries concluded "that there is sufficient evidence to regard tamoxifen as a human carcinogen that increases a woman's risk of developing.... cancer of the endometrium, the inner lining of the uterus."12

When the news came out reporting that breast cancer patients who take tamoxifen for five years or longer might have triple the risk of uterine cancer13, many researcher said that "it's no big deal" since early detection of endometrial cancer rarely results in death. That statement infuriated critics who noted that the treatment for uterine cancer is a hysterectomy. However, now it is known that breast cancer patients who develop uterine cancer while using tamoxifen are likely to have a fast moving, lethal form of the disease.14

In September 2000, The Lancet reported a study which showed that the drug tamoxifen, often used to treat breast cancer and as a preventive in some high risk women as well, increased the risk of developing endometrial cancer. In addition, this risk increased with time, leading researchers to question the use of the drug in healthy women. It found that women who took tamoxifen for 2 to 5 years had twice the risk of the cancer as women who have not taken it. Women who had taken it for 5 years or more have a seven times higher risk of endometrial cancer. The total increased risk for all women who used tamoxifen at all was 50%. Advanced endometrial cancers were more common in women who had taken tamoxifen long-term than in those who had not. The 3-year survival for endometrial cancer was "significantly worse" for long-term tamoxifen users.

Gastrointestinal Cancer
It also should be noted that tamoxifen has also been associated with gastrointestinal cancers.


Posted by: Mudge

Quote:
Originally Posted by dg806
Liver Cancer and Liver Disease
Tamoxifen is toxic to the liver, and there have been reports of acute hepatitis in patients treated with tamoxifen. Liver damage has occurred in every animal given tamoxifen. According to Gary Williams, medical director of the American Heart Foundation, tamoxifen has been shown in animal studies to be a "rip-roaring" liver carcinogen, inducing highly aggressive cancers in about 12 per cent of rats. (7)
This was the first reason I tell people dont take the shit all through a cycle.


Posted by: TrojanMan60563

wow that was a great read....so even PCT drugs can become bad news.


Posted by: Mudge

Uhh yeah, they are drugs after all. Not to be abused.

If you have to take something 5 years in a row, there is a good chance something is very wrong. There are many reasons not to abuse any drug.


Posted by: BoneCrusher

Thanks Dg. My ex needs to know this ... she just finished treatment for breast cancer and is taking a preventitive treatment prescription drug for the next 5 years.


Posted by: Mudge

There was a female doctor who claimed to reduce her own cancer down to nothing with flax seed oil mixed in with her cottage cheese. I wish I still had that article.


Posted by: brodus

Three things to remember:

1. If you don't have a uterous, your chances of getting uterine cancer are very, very low.

2. If you only use Tamox. for PCT three times a year, and follow normal dosing (big dose first week, tapering down on weeks 2-4), you're only exposed to it for a short time, and not at the level that cancer patients are.

3. Tamox. should not be used on-cycle as an AI--only for a gyno flareup. Letro or A-dex (or Formestane--trans or inject.) are better choices for on-cycle AI.

Although, I have to say, I read all of this, and more a few months ago and posted on Anabolic Minds my concerns. My line of reasoning was/is-->if there is something else you can run for PCT that IS NOT a proven carcinogen, why not use that instead?

I was trying to come up with a better PCT solution-->like a combination of 6-OXO, and a few other things. I'm still not convinced that the Tamox. risks are worth the rewards for someone who doesn't seek to compete, and isn't running heavy-dose AAS cycles. I think there are solutions for those who desire moderate, PH-based gains and good recovery that do not require injestion of a known carcinogen.


Posted by: dg806

Quote:
Originally Posted by BoneCrusher
Thanks Dg. My ex needs to know this ... she just finished treatment for breast cancer and is taking a preventitive treatment prescription drug for the next 5 years.
Best of luck to both of you!


Posted by: BoneCrusher




Posted by: musclepump

It isn't even the cancer stuff that scares me, just the damage to the eye stuff.


Posted by: TrojanMan60563

Quote:
Originally Posted by musclepump
It isn't even the cancer stuff that scares me, just the damage to the eye stuff.

I would pick going blind over cancer any day of the week. Being blind won't kill you...cancer is highly dangerous and most die.


Posted by: brodus

So how carcinogenic is 6-OXO?

And how much worse is for PCT from 1T/4AD than Tamox?

This is what I'm getting at--what's the true risk/benefit/cost ratio.


Posted by: Tha Don

Quote:
Originally Posted by musclepump
It isn't even the cancer stuff that scares me, just the damage to the eye stuff.
haha "i don't mind dying a slow painful death from cancer... but hell i ain't wearing no fuckin specs!"

musclepump u crack me up!


Posted by: soxmuscle

Theres no way ones better than the other, because they both are just truley horrible, but there is no reason to live if you can't see what life has to offer.


Posted by: BoneCrusher

Just to let ya know Dg ... it was Tamoxifen and she is ending that. She didn't really want to any more drugs anyway ... can't blame her on that either.


Posted by: musclepump

Contacts are ok, but if it's total vision loss, I'd rather die.


Posted by: Flex

Quote:
Originally Posted by soxmuscle
there is no reason to live if you can't see what life has to offer.
damn you're shallow.

tell that to Ray Charles or ANY other blind person lucky enough to be alive.


Posted by: Flex

didn't know this about nolva. looks like its back to the drawing board...


Posted by: brodus

Quote:
Originally Posted by Flex
damn you're shallow.

tell that to Ray Charles or ANY other blind person lucky enough to be alive.
Yeah, no shit.

I'm a musician, and a philosopher. I don't want to die. There are many things I will do tp [rvetn prematur death.


Posted by: JerseyDevil

Let me just throw this out there. The same person, Sherrill Sellman, wrote both of those articles and both, are linked to 'all natural' sites.

Not saying the info is false, but maybe a self serving, alarmist attitude. Note the articles were 6 to 7 years old. If there is a big threat, the FDA usually acts quickly. So I would take these articles with a grain of salt. My 2 clams.


Posted by: Cold Iron

Quote:
Originally Posted by Flex
damn you're shallow.

tell that to Ray Charles or ANY other blind person lucky enough to be alive.

It's a completely different thing to be born blind, as opposed to losing your vision.


Posted by: milwood

Scary stuff to be sure. Agree with Brodus on circumspect use of nolva; PCT only (barring gyno issues) and only when necessarry (for harsh and/or long cycles). It is a risky, toxic substance. 6-OXO and other similar substances are preferrable, when possible. Some new PCT compounds are on the horizon as well which look good (and safer). Thanks for sharing this.


Posted by: brodus

Actually, if you doubt the author of the article, do some research on your own. I did a few months ago, and started a similar thread after being astounded at the nearly universal condemnation of Nolva from science groups around the globe; that, and the fact that it IS listed as a carcinogen...seems at odds with trying to be a healthy person.

And yes-->keep your eyes open for new PCT compounds...I know of at least two that are coming out.


Posted by: JerseyDevil

Quote:
Originally Posted by brodus
And yes-->keep your eyes open for new PCT compounds...I know of at least two that are coming out.
If gyno symptoms occur while on cycle, what would you use in place of tamoxifen? That's the bigger issue for me since I'm on HRT and don't do a conventional pct.


Posted by: Flex

Quote:
Originally Posted by Cold Iron
It's a completely different thing to be born blind, as opposed to losing your vision.
what's your point?

My point was that his statement "there's no reason to live if you can't see" was ridiculous.


Posted by: brodus

Ray wasn't born blind.

Stevie Wonder was.

I'm glad neither shared the naive, solipsistic sentiment you expressed, regarding death as better than life in blindness.


Posted by: dg806

Quote:
Originally Posted by brodus
And yes-->keep your eyes open for new PCT compounds...I know of at least two that are coming out.
DS.............7-OH-Diacetate


Posted by: Dale Mabry

I like how Nolvadex has been shown to be carcinogenic in rare occasions so we should avoid it, yet it is perfectly fine to take something that is a few months old and has no long term safety data behind it. Great logic.

BTW, the word carcinogen is thrown around without context. If you knew how many of the daily things you ingest contained carcinogens you would die of starvation. Peanut butter has a couple very strong carcinogens, the sun is a carcinogen, french fries, anything fried in oil, hell, even gear can be considered a carcinogen indirectly because it raises estrogen levels.

I think it was Brodus who stated it before, if yur not taking 3 pills a day for 5-6 years you are fine. You would also have to have cancer run in your family.


Posted by: dg806

Quote:
Originally Posted by Dale Mabry
I like how Nolvadex has been shown to be carcinogenic in rare occasions so we should avoid it, yet it is perfectly fine to take something that is a few months old and has no long term safety data behind it. Great logic.

BTW, the word carcinogen is thrown around without context. If you knew how many of the daily things you ingest contained carcinogens you would die of starvation. Peanut butter has a couple very strong carcinogens, the sun is a carcinogen, french fries, anything fried in oil, hell, even gear can be considered a carcinogen indirectly because it raises estrogen levels.
Oh now you show up out of the blue j/k/
Very true words though!


Posted by: topolo

dale is right!


Posted by: Dale Mabry

How the hell did this get bumped? Anywho, one more thing to ponder. i don't remember what the stats were, something like 7x more likely to develop cancer. What you have to understand is that the results only bang out for people who already have cancer. You take Tamoxifen for cancer, so if you are taking it you already have cancer. So the person is 7x more likely to develop cancer in their twat after breast cancer if they take tamoxifen. Hardly results you could transfer to someone using it for PCT. If you are at high risk for cancer (Family Hx, past issues) I would avoid it, though. There are too many uncontrolled variables in this as well.


Posted by: TrojanMan60563

I guess its a good thing I don't have a twat huh?


Posted by: Pirate!

Damn, if I get twat cancer, I'm going to be pissed!


Posted by: PWGriffin

Quote:
Originally Posted by PirateFromHell
Damn, if I get twat cancer, I'm going to be pissed!


It is good to know the possibilities of harmful side effects though, It could make a person approach PCT with a little more care. And I for one, will not take it on cycle...I'm cool with retaining a little water and I'm not prone to gyno.


Posted by: Tough Old Man

I'll still continue to use it for PCT


Posted by: Evil ANT

I was going to make a new thread for this question, but figured I'd just bump this one.

I ordered some tamox a while back for my PCT, and now's come time for me to actually use it. Only problem is, I have no clue what the recommended dosage is. I'm completely unfamiliar with tamox as I've always used nolva or clomid in the past.

I think I'll risk the cancer and use up this tamox since I bought two bottles of the stuff. Anyone have any dosage suggestions?




Posted by: dg806

You just have to adjust your dosage of citrate to regular Nolvadex.
60/40/40/20 will probably work. What did your cycle consist of?


Posted by: Evil ANT

My cycle consisted of 600 mg's a week test cyp, 75 mg's EOD tren, and 50 mg's a day winny.

Not sure how much tamox to take, or where to even take the stuff. I'm completely new to it.



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