Spending time outside might have some health benefits — and the 'greening' of exercise might have some more.
Summer is the time when the outdoors beckons. We go to the beach in droves, have picnics and barbecues, paddle and fish and swim. Some hike, others bike, and a few do both — although not at the same time.
But these good times in the out of doors are really an exception to the rule, which is that most of us spend the vast majority of our time inside. According to one government estimate, the average American spends 90% of his or her life indoors, and as we get older we become even more inclined not to venture out.
When we do, there's a gantlet of precautions: slather on the sunscreen; take it easy — or head indoors — if air quality is bad; watch out for ticks, mosquitoes, and other creatures that might bite. It's all very well-meaning but it also reinforces indoor ways.
So it's back into the bunker — but that might not be good for you. The study results are ticking up: spending time outdoors seems to have discernible benefits for physical and mental health. Granted, some are merely by association and can be achieved by other means, perhaps while indoors, but often only with a good deal more trouble and expense. Here are five potential benefits of spending more time outdoors:
1. Your vitamin D levels will go up
Vitamin D is called the sunshine vitamin because sunlight hitting the skin begins the circuitous process — the liver and kidneys get involved — that eventually leads to the creation of the biologically active form of the vitamin. Over all, research is showing that many vitamins, while necessary, don't have such great disease-fighting powers, but vitamin D may prove to be the exception. Epidemiologic studies are suggesting it may have protective effects against everything from osteoporosis to cancer to depression to heart attacks and stroke. Even by conventional standards, many Americans don't have enough vitamin D circulating in their bodies. The good news is that you'll make all the vitamin D you need if you get outside a few times a week during these summer days and expose your arms and legs for 10 to 15 minutes. Of course, it has to be sunny out.
There are some snags. Vitamin D production is affected by age (people ages 65 and over generate about a fourth as much as people in their 20s) and skin color (African Americans have, on average, about half the levels of vitamin D in their blood as white Americans).
Another problem: sunscreens are most effective at blocking the ultraviolet B (UVB) light, the part of the spectrum that causes sunburn, but UVB also happens to be the kind of light that kick-starts the generation of vitamin D in the skin.
The either-or of sunscreen and sunshine vitamin has stirred up a lot of controversy and debate between pro-sunscreen dermatologists and the vitamin D camp. But there is plenty of middle ground here: some limited sun exposure on short walks and the like, supplemented with vitamin D pills if necessary, and liberal use of sunscreen when you are out for extended periods, particularly during the middle of the day.
2. You'll get more exercise (especially if you're a child)
You don't need to be outside to be active: millions of people exercise indoors in gyms or at home on treadmills and elliptical trainers. Nor is being outside a guarantee of activity. At the beach on a summer day most people are in various angles of repose.
Still, there's no question that indoor living is associated with being sedentary, particularly for children, while being outdoors is associated with activity. According to some surveys, American children spend an average of 6� hours a day with electronic media (video games, television, and so on), time that is spent mainly indoors and sitting down. British researchers used Global Positioning System devices and accelerometers, which sense movement, to track the activity of 1,000 children. They found that the children were more than doubly active when they were outside.
Adults can go to the gym. Many prefer the controlled environment there. But if you make getting outside a goal, that should mean less time in front of the television and computer and more time walking, biking, gardening, cleaning up the yard, and doing other things that put the body in motion.
3. You'll be happier (especially if your exercise is 'green')
Light tends to elevate people's mood, and unless you live in a glass house or are using a light box to treat seasonal affective disorder, there's usually more light available outside than in. Physical activity has been shown to relax and cheer people up, so if being outside replaces inactive pursuits with active ones, it might also mean more smiles and laughter.
Researchers at the University of Essex in England are advancing the notion that exercising in the presence of nature has added benefit, particularly for mental health. Their investigations into "green exercise," as they are calling it, dovetails with research showing benefits from living in proximity to green, open spaces.
In 2010 the English scientists reported results from a meta-analysis of their own studies that showed just five minutes of green exercise resulted in improvements in self-esteem and mood.
Mind you, none of the studies were randomized controlled trials. The intuitive appeal of green exercise is its strength, not the methodological rigor of the research supporting it. It's hard to imagine how a stroll in a pretty park wouldn't make us feel better than a walk in a drab setting.
4. Your concentration will improve
Richard Louv coined the term "nature-deficit disorder" in his 2008 book Last Child in the Woods. It's a play on attention deficit hyperactivity disorder (ADHD). Researchers have, in fact, reported that children with ADHD seem to focus better after being outdoors. A study published in 2008 found that children with ADHD scored higher on a test of concentration after a walk through a park than after a walk through a residential neighborhood or downtown area. Other ADHD studies have also suggested that outdoor exercise could have positive effects on the condition. Truth be told, this research has been done in children, so it's a stretch to say it applies to adults, even those who have an ADHD diagnosis. But if you have trouble concentrating — as many do — you might see if some outdoor activity, the greener the better, helps.
5. You may heal faster
University of Pittsburgh researchers reported in 2005 that spinal surgery patients experienced less pain and stress and took fewer pain medications during their recoveries if they were exposed to natural light. An older study showed that the view out the window (trees vs. a brick wall) had an effect on patient recovery. Of course, windows and views are different than actually being outside, but we're betting that adding a little fresh air to the equation couldn't hurt and might help.
Health.harvard.edu
Protection against uterine cancer is a required for any person who would like to stay a healthy lifestyle. Uterine Cancer is quite dangerous and is one of many a few varieties of cancer that affect girls. This article provides comprehensive techniques to prevent uterine cancer, if perhaps fully executed uterine cancer may perhaps one thing of history.
Easy methods to reduce uterine cancer make the perfect problem in the majority of reproduction women of all ages. Recent researchers have says regarding 75% regarding reproductive : for women who live a better prospects for contradicting the illness. Uterine Cancer can get inside feminine reproductive : in recent times and continue to be unnoticed over time. Uterine Cancer can certainly emanate coming from modest issues including endometrial hyperplasia. Uterine Cancer is usually a deadly ailment and as a consequence calls for fast knowledge in addition to tips about how to prevent uterine cancer. Uterine Cancer if perhaps recognized early from the cautionary indicators may be treatable. As a result knowing the signs is a superb part in excretion of uterine cancer.
This short article considers the various tips about how to avert uterine cancer. All of the strategies mentioned within the content mainly depend upon anyone, your effort inside following your tips is vital with uterine cancer prevention. Those tips listed here are vital within prevention of uterine cancer.
Innate information and facts. You should determine whether in your quick family members anyone has experienced uterine cancer,Bladder Cancer Symptoms. The moving past associated with genes may be connected with multiply of uterine cancer.
Risk issues. You have to get enough exposure to risk elements which might be apt to be related to uterine cancer. More common threat aspects are weight problems, infertility along with endocrine therapies.
Health concerns. Some disorders just like diabetes mellitus will certainly result in uterine cancer. Other people are both equally early as well as later menstresion.
Wholesome life-style. Lifestyle a healthy our life is incredibly necessary within prevention of just about any disease which include uterine cancer. Ingesting involving well-balanced eating plan along with schedule routines can go quite some distance around keeping uterine cancer. Many research has said that individuals who those who survive cook have got nominal risk of hiring some types of cancer, uterine cancer is not any remarkable.
Stop bodily hormone options. Contraceptive tactics as well as hormone treatments are already straight linked with uterine cancer. Stay clear of this sort of approaches as well as patterns simply because this go a long way within making certain your current uterine cancer free of charge. While many debts were also set aside in reducing chances of uterine cancer. In this case it recommended that you confer with your health practitioner to know which usually is match for you personally through childbearing.
Weight management.It is possible to control your weight during the day healthful as well as foods abundant with nutritional value. Weight loss has become related to reduced cases of uterine cancer many alternative illnesses.
Pap smear. Though smear smear probably are not a detailed means of diagnosing uterine cancer, having a standard pelvic is an important take into account decreasing their shrinkage
Hypertension manage. Several sufferers told they have uterine cancer seemed to be uncovered rich in blood pressure; for that reason determining your strain is one of the most effective tips about how to avert uterine cancer. Hypertension can be manipulated to eat foods which may have small sodium written content.
Coverage every Uterine Cancer Symptoms for your health practitioner. The normal warning related to uterine cancer can be irregular in addition to common hemorrhage. This sort of signals if recognized early along with preventive along with treatment procedures used can easily drastically aid in management of uterine cancer.
Easy methods to reduce uterine cancer make the perfect problem in the majority of reproduction women of all ages. Recent researchers have says regarding 75% regarding reproductive : for women who live a better prospects for contradicting the illness. Uterine Cancer can get inside feminine reproductive : in recent times and continue to be unnoticed over time. Uterine Cancer can certainly emanate coming from modest issues including endometrial hyperplasia. Uterine Cancer is usually a deadly ailment and as a consequence calls for fast knowledge in addition to tips about how to prevent uterine cancer. Uterine Cancer if perhaps recognized early from the cautionary indicators may be treatable. As a result knowing the signs is a superb part in excretion of uterine cancer.
This short article considers the various tips about how to avert uterine cancer. All of the strategies mentioned within the content mainly depend upon anyone, your effort inside following your tips is vital with uterine cancer prevention. Those tips listed here are vital within prevention of uterine cancer.
Innate information and facts. You should determine whether in your quick family members anyone has experienced uterine cancer,Bladder Cancer Symptoms. The moving past associated with genes may be connected with multiply of uterine cancer.
Risk issues. You have to get enough exposure to risk elements which might be apt to be related to uterine cancer. More common threat aspects are weight problems, infertility along with endocrine therapies.
Health concerns. Some disorders just like diabetes mellitus will certainly result in uterine cancer. Other people are both equally early as well as later menstresion.
Wholesome life-style. Lifestyle a healthy our life is incredibly necessary within prevention of just about any disease which include uterine cancer. Ingesting involving well-balanced eating plan along with schedule routines can go quite some distance around keeping uterine cancer. Many research has said that individuals who those who survive cook have got nominal risk of hiring some types of cancer, uterine cancer is not any remarkable.
Stop bodily hormone options. Contraceptive tactics as well as hormone treatments are already straight linked with uterine cancer. Stay clear of this sort of approaches as well as patterns simply because this go a long way within making certain your current uterine cancer free of charge. While many debts were also set aside in reducing chances of uterine cancer. In this case it recommended that you confer with your health practitioner to know which usually is match for you personally through childbearing.
Weight management.It is possible to control your weight during the day healthful as well as foods abundant with nutritional value. Weight loss has become related to reduced cases of uterine cancer many alternative illnesses.
Pap smear. Though smear smear probably are not a detailed means of diagnosing uterine cancer, having a standard pelvic is an important take into account decreasing their shrinkage
Hypertension manage. Several sufferers told they have uterine cancer seemed to be uncovered rich in blood pressure; for that reason determining your strain is one of the most effective tips about how to avert uterine cancer. Hypertension can be manipulated to eat foods which may have small sodium written content.
Coverage every Uterine Cancer Symptoms for your health practitioner. The normal warning related to uterine cancer can be irregular in addition to common hemorrhage. This sort of signals if recognized early along with preventive along with treatment procedures used can easily drastically aid in management of uterine cancer.
A Medtronic product, when used in high doses during spinal fusionprocedures, might increase patient cancer risks, according to data released Thursday at a national conference of spine surgeons.
The data had been given to the Food and Drug Administration by Medtronic when it sought approval to market a high-strength version of an existing bone growth product called Infuse. Based on those study findings, the F.D.A. rejected that higher-dose formulation, known as Amplify, citing concern about cancer risks.
But in presenting data at the conference on Thursday, Dr. Eugene J. Carragee of Stanford University said that not all the findings of a Medtronic-sponsored clinical trial had been made public before. The trial results showed a significantly higher number of cancers in the study group that received Amplify when compared to a control group that received a bone graft as part of a spinal fusion, he said.
Dr. Carragee added that the Amplify study findings had potential implications for patients who received Infuse, because both products contained the same active ingredient, a bioengineered bone growth protein known as rhBMP-2.
In a telephone interview, Dr. Carragee said that doctors often administered Infuse off-label at levels significantly above the recommended dosages, ones that approach or exceed the amount of rhBMP-2 found in a dose of Amplify.
“This information requires careful consideration because of the large number of patients receiving high doses” of Infuse, he said, adding that he was particularly concerned about its use in certain patients like smokers or those with genetic factors that put them at higher risk for cancer.
Dr. Carragee and researchers detailed the study at a meeting in Chicago of the North American Spine Society, a professional organization. It showed that three years after surgery, there were 20 cancers in the Amplify group versus five cases in the bone graft group. Cancers take many years to develop, so the data might indicate that the bone growth protein plays a role in promoting cancer rather than causing it.
Medtronic's Infuse had already been at the center of a debate between Dr. Carragee and the drug's supporters.
In June, a medical publication that Dr. Carragee edits, The Spine Journal, released a special issue containing articles that challenged earlier published research backing the widespread use of Infuse. The researchers involved in the Medtronic-sponsored studies defended their findings.
In response to that publication, Medtronic gave a $2.5 million grant in August to Yale University to conduct an independent review of all study data that examined the safety and effectiveness of Infuse. That report is not expected to be completed until some time next year.
Asked for comment on Dr. Carragee's presentation Thursday, a Medtronic spokeswoman, Marybeth Thoorsgard, released a statement stating that “the results from the independent reviews being managed by Yale will address the safety and effectiveness” of Infuse.
This article has been revised to reflect the following correction:
Correction: November 3, 2011
TheNewYorkTimes
The data had been given to the Food and Drug Administration by Medtronic when it sought approval to market a high-strength version of an existing bone growth product called Infuse. Based on those study findings, the F.D.A. rejected that higher-dose formulation, known as Amplify, citing concern about cancer risks.
But in presenting data at the conference on Thursday, Dr. Eugene J. Carragee of Stanford University said that not all the findings of a Medtronic-sponsored clinical trial had been made public before. The trial results showed a significantly higher number of cancers in the study group that received Amplify when compared to a control group that received a bone graft as part of a spinal fusion, he said.
Dr. Carragee added that the Amplify study findings had potential implications for patients who received Infuse, because both products contained the same active ingredient, a bioengineered bone growth protein known as rhBMP-2.
In a telephone interview, Dr. Carragee said that doctors often administered Infuse off-label at levels significantly above the recommended dosages, ones that approach or exceed the amount of rhBMP-2 found in a dose of Amplify.
“This information requires careful consideration because of the large number of patients receiving high doses” of Infuse, he said, adding that he was particularly concerned about its use in certain patients like smokers or those with genetic factors that put them at higher risk for cancer.
Dr. Carragee and researchers detailed the study at a meeting in Chicago of the North American Spine Society, a professional organization. It showed that three years after surgery, there were 20 cancers in the Amplify group versus five cases in the bone graft group. Cancers take many years to develop, so the data might indicate that the bone growth protein plays a role in promoting cancer rather than causing it.
Medtronic's Infuse had already been at the center of a debate between Dr. Carragee and the drug's supporters.
In June, a medical publication that Dr. Carragee edits, The Spine Journal, released a special issue containing articles that challenged earlier published research backing the widespread use of Infuse. The researchers involved in the Medtronic-sponsored studies defended their findings.
In response to that publication, Medtronic gave a $2.5 million grant in August to Yale University to conduct an independent review of all study data that examined the safety and effectiveness of Infuse. That report is not expected to be completed until some time next year.
Asked for comment on Dr. Carragee's presentation Thursday, a Medtronic spokeswoman, Marybeth Thoorsgard, released a statement stating that “the results from the independent reviews being managed by Yale will address the safety and effectiveness” of Infuse.
This article has been revised to reflect the following correction:
Correction: November 3, 2011
TheNewYorkTimes
By yourself, you are the most critical in obtaining lessen stomach ulcers. Altering your diet program in addition to behavior might considerably have a very extended deal in ways to get rid of stomach ulcers.
Stomach ulcer normally referenced united states peptic ulcer is whithin this gastrointestinal area. This perhaps the belly is usually acid in addition to staying have contracted abs ulcer can be quite hurtful. It really is often brought on by way of infection regarding helicobacter pylori bacterium. It really is drastically wrong to consentrate that will stomach ulcers are due to stress along with inadequate eating habits. The most popular the signs of stomach cancer will be burning ache from the belly portion of the abdominal of course, if this is linked to feeding on and also diet plan. This post looks at approaches plus suggestions which can be used inside getting gone tummy ulcer.
Look at the medical professional often. Stomach Ulcers are certainly hurtful so because of this should be addressed. A lot of people have mislaid the everyday life for that reason scourge. The surgeon is able to do lab tests and find out the main cause of this ulcer and whether it be linked to Heli-copter pylori and provides the best medicinal drugs.
Ulcer prescription drugs. Most likely among the list of easiest ways to learn how to get reduce tummy ulcer is by getting ulcer medications. In case you are clinically diagnosed by the health practitioner out of stomach ulcers after that is just about to consider the total dosage involving health-related solutions. Taking antacids and also plaque created by sugar blockers can significantly remove the stomach ulcers. Removing the particular prescription antibiotics considerably lowers heli pylori. Utilizing prescription medication around essential amounts depending on the level of your peptic issues can be quite a wonderful therapy regarding how to get rid of abdomen ulcer.
Prevent some types. Non-steroidal along with anti-inflammatory drugs are hugely related to always be one of several major causes with stomach ulcers. Many of these prescription drugs incorporate discomfort, these types of medicine is distributed which are non-prescription and simply available, generating their particular way to abdomens. Even if you are experiencing headache you need to keep away from getting of the drugs. Most of these medication destroy the actual gastro abdominal.These types of drug treatments as well slow up the degree of mucous developed as well as get a new neutralizing bicarbonates.
Right diet. Quite a few sorts of foodstuff have already been proved to boost the harshness of Stomach Flu Symptoms . Just about any diet regime which enhances the amount this p inside the abdominal could have adverse effects on your own peptic issues. Therefore I recommend a take in of meals abundant in protein and have these individuals often but small amounts. A few of the drinks including alcoholics this boost sores as part of your tummy. These people erode mucous around the abdominal lining thus causing skin cells plus tissue visibility. You must steer clear of alcohol consumption and coffee as they could cause more damage for your requirements.
Dairy. Products and solutions including exploit, cheese and also ghee might stop the particular stomach Ulcer Symptoms. These people neutralize the particular acid in the abs. Making it smart to boost the amount of absorption regular to receive minimize in the sores.
Additional points. Those tips listed here have also made it easier for other individuals when you get gone stomach ulcers and are generally well worth being showcased. Implementing tiny rub down can help to eliminate the pain triggered by means of stomach ulcers. You possibly can complete a massage therapy on your own or perhaps find the help of somebody else. Employing heat is also recommended, several enjoyable warmth utilized while in the abdominal spot is able to reduce the anguish.
Stomach ulcer normally referenced united states peptic ulcer is whithin this gastrointestinal area. This perhaps the belly is usually acid in addition to staying have contracted abs ulcer can be quite hurtful. It really is often brought on by way of infection regarding helicobacter pylori bacterium. It really is drastically wrong to consentrate that will stomach ulcers are due to stress along with inadequate eating habits. The most popular the signs of stomach cancer will be burning ache from the belly portion of the abdominal of course, if this is linked to feeding on and also diet plan. This post looks at approaches plus suggestions which can be used inside getting gone tummy ulcer.
Look at the medical professional often. Stomach Ulcers are certainly hurtful so because of this should be addressed. A lot of people have mislaid the everyday life for that reason scourge. The surgeon is able to do lab tests and find out the main cause of this ulcer and whether it be linked to Heli-copter pylori and provides the best medicinal drugs.
Ulcer prescription drugs. Most likely among the list of easiest ways to learn how to get reduce tummy ulcer is by getting ulcer medications. In case you are clinically diagnosed by the health practitioner out of stomach ulcers after that is just about to consider the total dosage involving health-related solutions. Taking antacids and also plaque created by sugar blockers can significantly remove the stomach ulcers. Removing the particular prescription antibiotics considerably lowers heli pylori. Utilizing prescription medication around essential amounts depending on the level of your peptic issues can be quite a wonderful therapy regarding how to get rid of abdomen ulcer.
Prevent some types. Non-steroidal along with anti-inflammatory drugs are hugely related to always be one of several major causes with stomach ulcers. Many of these prescription drugs incorporate discomfort, these types of medicine is distributed which are non-prescription and simply available, generating their particular way to abdomens. Even if you are experiencing headache you need to keep away from getting of the drugs. Most of these medication destroy the actual gastro abdominal.These types of drug treatments as well slow up the degree of mucous developed as well as get a new neutralizing bicarbonates.
Right diet. Quite a few sorts of foodstuff have already been proved to boost the harshness of Stomach Flu Symptoms . Just about any diet regime which enhances the amount this p inside the abdominal could have adverse effects on your own peptic issues. Therefore I recommend a take in of meals abundant in protein and have these individuals often but small amounts. A few of the drinks including alcoholics this boost sores as part of your tummy. These people erode mucous around the abdominal lining thus causing skin cells plus tissue visibility. You must steer clear of alcohol consumption and coffee as they could cause more damage for your requirements.
Dairy. Products and solutions including exploit, cheese and also ghee might stop the particular stomach Ulcer Symptoms. These people neutralize the particular acid in the abs. Making it smart to boost the amount of absorption regular to receive minimize in the sores.
Additional points. Those tips listed here have also made it easier for other individuals when you get gone stomach ulcers and are generally well worth being showcased. Implementing tiny rub down can help to eliminate the pain triggered by means of stomach ulcers. You possibly can complete a massage therapy on your own or perhaps find the help of somebody else. Employing heat is also recommended, several enjoyable warmth utilized while in the abdominal spot is able to reduce the anguish.
Drug interactions may increase risk of cancer recurrence or death.
Tamoxifen is a standard adjuvant treatment for women with estrogen receptor-positive breast cancer — the most common type, fueled by the hormone estrogen. Typically, women take tamoxifen for five years after undergoing initial cancer treatment (surgery, radiation, or chemotherapy). The drug is also used as a preventive agent for women at high risk of developing breast cancer, based on family history or genetic profile.
Since it received FDA approval in 1977, tamoxifen has reduced breast cancer recurrences by one-half and breast cancer deaths by one-third in women with early-stage estrogen receptor-positive breast cancer. Unfortunately, the drug does not benefit every woman who takes it.
One reason is genetic. The liver uses the cytochrome P450 enzymes to metabolize many drugs. One of them, CYP2D6, is the principal enzyme that converts tamoxifen into endoxifen, a form that is active in the body. Variations in the gene that synthesizes CYP2D6 can limit women's ability to convert tamoxifen into its active form; about 7% of women have no CYP2D6 activity.
But drug interactions also contribute — an important consideration for mental health clinicians, as approximately 20% to 30% of the women who take tamoxifen also use antidepressants to alleviate depression, anxiety, or hot flashes. Some antidepressants are such strong inhibitors of CYP2D6 that women who take these drugs may not benefit from tamoxifen. Two papers suggest that three antidepressants — paroxetine (Paxil), fluoxetine (Prozac), and bupropion (Wellbutrin) — are most likely to inhibit CYP2D6 and interfere with tamoxifen treatment.
In one paper, researchers at McGill University reviewed seven clinical studies of women taking both tamoxifen and antidepressants. They also examined laboratory studies to assess the inhibitory effects of various antidepressants on the CYP2D6 enzyme in cell cultures. They found consistent evidence that two selective serotonin reuptake inhibitors (SSRIs) — paroxetine and fluoxetine — were strong inhibitors of CYP2D6. Indirect evidence from the laboratory studies suggested that bupropion, an antidepressant that affects the neurotransmitters norepinephrine and dopamine, also severely inhibits CYP2D6. Other drugs had less of an impact on this enzyme (see table).
Choosing among antidepressants
Antidepressants vary in their ability to inhibit CYP2D6 (the enzyme that converts tamoxifen into its active form, endoxifen).
Drug
Effect on CYP2D6
Advice
venlafaxine (Effexor)
Minimal
Safest choice if taken with tamoxifen.
desvenlafaxine (Pristiq), mirtazapine (Remeron)
Direct studies with tamoxifen are lacking, but effect on endoxifen levels should be minimal.
citalopram (Celexa), escitalopram (Lexapro), nefazodone (Serzone)
Mild
Secondary choices if above are not options.
Only citalopram and sertraline have been studied directly with tamoxifen, so risk of reducing levels of endoxifen should be weighed against benefits of antidepressants.
duloxetine (Cymbalta), sertraline (Zoloft), fluvoxamine (Luvox)
Moderate
paroxetine (Paxil), fluoxetine (Prozac), bupropion (Wellbutrin)
Strong
Best to avoid if taking tamoxifen.
Source: Desmarais JE, et al. Journal of Clinical Psychiatry (Dec. 2009): Vol. 70, No. 12, pp. 1688-97.
More recently, researchers at Sunnybrook Health Sciences Centre in Toronto published the first study designed to examine whether CYP2D6 inhibition affected clinical outcomes of women taking both tamoxifen and SSRIs. The researchers analyzed health care records for 2,430 women age 66 and older who began tamoxifen treatment between 1993 and 2005 and were also taking a single SSRI. (They excluded those who switched to another SSRI during tamoxifen treatment, or who took another type of antidepressant.)
When the study ended in 2007, 374 of the women had died of breast cancer. When the researchers broke the deaths down by SSRI use and compared hazard ratios, they estimated that, within five years after ending tamoxifen treatment, one additional breast cancer death would occur for every 20 women who used paroxetine for 41% of the time they were also taking tamoxifen (the median duration of combined use in the study). Risk of death increased with duration of the paroxetine-tamoxifen overlap.
Although the McGill researchers found that fluoxetine had a strong effect on CYP2D6, the Toronto researchers found no evidence that this drug increased risk of death, although they cautioned that the number of women taking this SSRI may have been too small to provide sufficient statistical power. They also examined outcomes for women taking four other SSRIs, and found no evidence that any of these drugs affected mortality, although (once again) small sample sizes were a problem.
Both of these studies had limitations. The McGill study involved clinical trials designed mainly to look at genetic profiles and tamoxifen metabolism, for example. And the Toronto researchers were unable to obtain information about breast cancer stage in participants — obviously an important predictor of survival.
Nevertheless, these studies add to a growing body of evidence that certain antidepressants can hinder the anticancer effects of tamoxifen. Although the evidence is not yet perfect, clinicians treating women taking tamoxifen are wise to avoid prescribing the antidepressants that are most likely to inhibit CYP2D6.
Women who are unable to take or switch to an antidepressant that is less likely to interfere with tamoxifen could ask their oncologists about other anti-estrogen drugs. Raloxifene (Evista), for example, is metabolized differently from tamoxifen and does not rely on any of the cytochrome P450 enzymes. Other alternatives are drugs such as anastrozole (Arimidex) and letrozole (Femara), which are metabolized through the CYP19 enzyme rather than CYP2D6.
Additional research is under way to examine the impact of particular antidepressants on tamoxifen metabolism, and may provide additional guidance once published.
Desmarais JE, et al. "Interactions Between Tamoxifen and Antidepressants via Cytochrome P450 2D6,"Journal of Clinical Psychiatry (Dec. 2009): Vol. 70, No. 12, pp. 1688–97.
Kelly CM, et al. "Selective Serotonin Reuptake Inhibitors and Breast Cancer Mortality in Women Receiving Tamoxifen: A Population-Based Cohort Study," BMJ (Feb. 2010): Vol. 340, electronic publication.
For more references, please see www.health.harvard.edu/mentalextra.
health.harvard.edu
Tamoxifen is a standard adjuvant treatment for women with estrogen receptor-positive breast cancer — the most common type, fueled by the hormone estrogen. Typically, women take tamoxifen for five years after undergoing initial cancer treatment (surgery, radiation, or chemotherapy). The drug is also used as a preventive agent for women at high risk of developing breast cancer, based on family history or genetic profile.
Since it received FDA approval in 1977, tamoxifen has reduced breast cancer recurrences by one-half and breast cancer deaths by one-third in women with early-stage estrogen receptor-positive breast cancer. Unfortunately, the drug does not benefit every woman who takes it.
One reason is genetic. The liver uses the cytochrome P450 enzymes to metabolize many drugs. One of them, CYP2D6, is the principal enzyme that converts tamoxifen into endoxifen, a form that is active in the body. Variations in the gene that synthesizes CYP2D6 can limit women's ability to convert tamoxifen into its active form; about 7% of women have no CYP2D6 activity.
But drug interactions also contribute — an important consideration for mental health clinicians, as approximately 20% to 30% of the women who take tamoxifen also use antidepressants to alleviate depression, anxiety, or hot flashes. Some antidepressants are such strong inhibitors of CYP2D6 that women who take these drugs may not benefit from tamoxifen. Two papers suggest that three antidepressants — paroxetine (Paxil), fluoxetine (Prozac), and bupropion (Wellbutrin) — are most likely to inhibit CYP2D6 and interfere with tamoxifen treatment.
In one paper, researchers at McGill University reviewed seven clinical studies of women taking both tamoxifen and antidepressants. They also examined laboratory studies to assess the inhibitory effects of various antidepressants on the CYP2D6 enzyme in cell cultures. They found consistent evidence that two selective serotonin reuptake inhibitors (SSRIs) — paroxetine and fluoxetine — were strong inhibitors of CYP2D6. Indirect evidence from the laboratory studies suggested that bupropion, an antidepressant that affects the neurotransmitters norepinephrine and dopamine, also severely inhibits CYP2D6. Other drugs had less of an impact on this enzyme (see table).
Choosing among antidepressants
Antidepressants vary in their ability to inhibit CYP2D6 (the enzyme that converts tamoxifen into its active form, endoxifen).
Drug
Effect on CYP2D6
Advice
venlafaxine (Effexor)
Minimal
Safest choice if taken with tamoxifen.
desvenlafaxine (Pristiq), mirtazapine (Remeron)
Direct studies with tamoxifen are lacking, but effect on endoxifen levels should be minimal.
citalopram (Celexa), escitalopram (Lexapro), nefazodone (Serzone)
Mild
Secondary choices if above are not options.
Only citalopram and sertraline have been studied directly with tamoxifen, so risk of reducing levels of endoxifen should be weighed against benefits of antidepressants.
duloxetine (Cymbalta), sertraline (Zoloft), fluvoxamine (Luvox)
Moderate
paroxetine (Paxil), fluoxetine (Prozac), bupropion (Wellbutrin)
Strong
Best to avoid if taking tamoxifen.
Source: Desmarais JE, et al. Journal of Clinical Psychiatry (Dec. 2009): Vol. 70, No. 12, pp. 1688-97.
More recently, researchers at Sunnybrook Health Sciences Centre in Toronto published the first study designed to examine whether CYP2D6 inhibition affected clinical outcomes of women taking both tamoxifen and SSRIs. The researchers analyzed health care records for 2,430 women age 66 and older who began tamoxifen treatment between 1993 and 2005 and were also taking a single SSRI. (They excluded those who switched to another SSRI during tamoxifen treatment, or who took another type of antidepressant.)
When the study ended in 2007, 374 of the women had died of breast cancer. When the researchers broke the deaths down by SSRI use and compared hazard ratios, they estimated that, within five years after ending tamoxifen treatment, one additional breast cancer death would occur for every 20 women who used paroxetine for 41% of the time they were also taking tamoxifen (the median duration of combined use in the study). Risk of death increased with duration of the paroxetine-tamoxifen overlap.
Although the McGill researchers found that fluoxetine had a strong effect on CYP2D6, the Toronto researchers found no evidence that this drug increased risk of death, although they cautioned that the number of women taking this SSRI may have been too small to provide sufficient statistical power. They also examined outcomes for women taking four other SSRIs, and found no evidence that any of these drugs affected mortality, although (once again) small sample sizes were a problem.
Both of these studies had limitations. The McGill study involved clinical trials designed mainly to look at genetic profiles and tamoxifen metabolism, for example. And the Toronto researchers were unable to obtain information about breast cancer stage in participants — obviously an important predictor of survival.
Nevertheless, these studies add to a growing body of evidence that certain antidepressants can hinder the anticancer effects of tamoxifen. Although the evidence is not yet perfect, clinicians treating women taking tamoxifen are wise to avoid prescribing the antidepressants that are most likely to inhibit CYP2D6.
Women who are unable to take or switch to an antidepressant that is less likely to interfere with tamoxifen could ask their oncologists about other anti-estrogen drugs. Raloxifene (Evista), for example, is metabolized differently from tamoxifen and does not rely on any of the cytochrome P450 enzymes. Other alternatives are drugs such as anastrozole (Arimidex) and letrozole (Femara), which are metabolized through the CYP19 enzyme rather than CYP2D6.
Additional research is under way to examine the impact of particular antidepressants on tamoxifen metabolism, and may provide additional guidance once published.
Desmarais JE, et al. "Interactions Between Tamoxifen and Antidepressants via Cytochrome P450 2D6,"Journal of Clinical Psychiatry (Dec. 2009): Vol. 70, No. 12, pp. 1688–97.
Kelly CM, et al. "Selective Serotonin Reuptake Inhibitors and Breast Cancer Mortality in Women Receiving Tamoxifen: A Population-Based Cohort Study," BMJ (Feb. 2010): Vol. 340, electronic publication.
For more references, please see www.health.harvard.edu/mentalextra.
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