Daily Aspirin Linked to Steep Drop in Cancer Risk

http://www.businessweek.com/lifestyle/content/healthday/647054.html

by aneth • 16 years ago

74 35 16 years ago

swombat3• 16 years ago

Is the statistical analysis behind this sound or does it suffer from the problems outlined in http://www.sciencenews.org/view/feature/id/57091/title/Odds_...

Also, are there any side-effects to eating an aspirin every day?

tickle_me_elmo• 16 years ago

It can cause bleeding.

melling• 16 years ago

A low dosage of 75 milligrams is still a problem?

sb• 16 years ago

I took 100 milligrams a day for prophylactic purposes for about 5 years. It caused severe gastritis, to the extent that I had to go to hospital last year. Since having to discontinue taking it for a medical procedure, I discovered that my stomach is much better and have never taken a single pill since.

eru• 16 years ago

Thanks for the link. Nice quote: "In fact, if you believe what you read in the scientific literature, you shouldn’t believe what you read in the scientific literature."

bd• 16 years ago

I wonder if this may be related to Aspirin's effect on inflammation.

Long term inflammation is supposed to be "bad thing". Taking low doses of Aspirin for long time may help with silent inflammations throughout the body.

This should be testable by comparing effects of Aspirin with other anti-inflammatory drugs (taken in similar regime).

Alex3917• 16 years ago

That's what I was thinking when I read this. I'd bet you would get even more benefit from taking a low dose of hemp oil, because not only is that a stronger (and less toxic) anti-inflammatory, but it's also anti-angiogenic. In any event though total morbidity is much more interesting than cancer risk.

pygy_2• 16 years ago

I don't think so, low dose aspirin has little effect on inflammation.

Aspirin (ASA)is special WRT NSAID, in that it inhibits the Cyclo-oxygenase (COX) enzymes irreversibly.

COX are a family of enzymes that transform arachidonic acid to various inflamatory mediators called the prostaoids (comprising prostaglandins, prostacyclin and thromboxanes). There are two subtypes, present in different tissues, but since ASA inhibits both kinds.

Platelets contain COX and uses it produce Thromoxane A2, a potent vasoconstrictor and platelet activator. Since platelets don't have a nucleus, the effect inhibitory effect is permanent in them. New platelets have to be produced in order to restore a normal clotting activity. Since the platelet have an half life of more than a week, the effect is long lasting.

Other cells can synthesize COX as needed. Low dose aspirin has thus little effect on them. You need a much higher dose to get a clinically noticeable anti-inflamatory response.

In blood vessels, activated platelets use COX to synthesize Thromoxane A2 (TXA). TXA further promotes vasoconstriction, platelet activation and aggregation, leading to the formation of a blood clot [1].

On the other hand, endothelial cells (the inner layer of blood vessels) use COX to synthesize a prostaglandin (PGI2), which antagonizes TXA (vasodilatation, platelet inhibition).

ASA disrupts the TXA2/PGI2 equilibrium in favor of PGI2, inhibiting platelet activation.

Other NSAID also have an anti-aggregation activity, but it is far more short lived, and requires anti-inflammatory doses to do so.

That said, I can't prove that a chronic, subclinical anti-inflammatory effect isn't at play here too.

EDIT:

A Google scholar search confirms that TXA2 is involved in carcinogenesis [2-3].

[1] Such a clot is fragile. It is then stabilized by the coagulation process: the irreversible binding of fibrinogen into a fibrine mesh.

[2] http://scholar.google.be/scholar?hl=nl&q=pgi2+neoplasm&#...

[3] http://scholar.google.be/scholar?hl=nl&q=txa2+neoplasm&#...

rue2• 16 years ago

To be precise, it apparently cuts the risk of death by 60% for colorectal cancers, and 21% overall for cancers.

It is still quite significant, but it does not actually prevent the cancers, just reduces their fatality rate.

swombat3• 16 years ago

Well, if you're one of the people who gets to live an extra 30 years because your colorectal cancer didn't kill you, i'd say that's a pretty damn big difference.

rue2• 16 years ago

I am not sure where I disagreed.

mtw• 16 years ago

I had a close relative who died couple of weeks ago from that cancer

sucks to know about this today..

robinwarren• 16 years ago

see the actual chance of dying from cancer here: http://www.cancer.org/Cancer/CancerBasics/lifetime-probabili...

So for men the lifetime risk of dying from some kind of cancer goes from about 23% to around 19% based on the 21% reduction in overall cancer deaths found in the study.

Specfically for 'death due to gastrointestinal cancers' dropping 54%. Assuming that statistic would be paired with the chance of death from stomach cancer at the above site, happy to be corrected if more of the cancers described there should be included. However if is just that then your chance of dying from that specific cancer goes from 0.53% to about 0.25%.

ugh3• 16 years ago

Now if only Aspirin wasn’t so damn expensive in Germany (and other European nations): http://andrewhammel.typepad.com/german_joys/2007/09/prescrip...

_stephan2• 16 years ago

Really? Acetylsalicylic acid is available as a cheap generic drug in Germany.

ugh3• 16 years ago

You won’t get 100 tablets for one Euro. Five Euro or so is maybe doable, you still have to buy them in a pharmacy.

thibaut_barrere2• 16 years ago

In France, a box of 20x1g pills is around 3 euros, so you can get 1g per day at 4.5€ per month (~0,15€ per day).

I find this rather cheap personally.

ugh3• 16 years ago

Most will be able to pay it but it is still obscenely expensive compared to what you pay elsewhere for completely stupid reasons.

alecco3• 16 years ago

How about real prevention:

http://en.wikipedia.org/wiki/Colorectal_cancer#Risk_factors

danteembermage• 16 years ago

Your tone is a bit suspect (what is not "real" about aspirin after all) but I liked your link. Especially "Physical inactivity: People who are physically active are at lower risk of developing colorectal cancer."

khafra2• 16 years ago

Unfortunately, that means we hackers with desk jobs had better be taking our aspirin (or getting a lot of colorectal activity, I suppose--refuse the scanner next time you fly).

alecco3• 16 years ago

It's a single isolated new study while the prevention on Wikipedia's article is amply supported and accepted. And instead of taking aspirins a healthier lifestyle will help with many other problems.

There are many side effects to taking aspirin regularly, even for a low dose. Gastrointestinal ulcers, blood acidity (calcium withdrawn from bones to compensate), and all the coagulation issues.

It's annoying high profile studies promoting quick fixes with a pill get all the attention while more important work is ignored. A healthy lifestyle can't be replaced with snake oil.

c0riander• 16 years ago

Interesting finding, but I wonder: did they allow those patients to opt-in to the aspirin regimen?

If so, it could potentially be related to other confounding variables -- eating healthier or avoiding certain chemicals or some such. Basically, allowing opt-ins suggests that people who do so could already be more vigilant about their health.

If not, given the previous indication of benefits from an aspirin regimen, I wonder if there was an ethical concern in not giving it to all patients.

wildmXranat• 16 years ago

And on the other hand, it may and mostly does increase the chance of stomach bleed. Isn't that the case and a good reason to not pop it like mints ?

aantix• 16 years ago

I think we can do better than "a good reason to not pop it like mints".

Aspirin Myocardial Infarction Study

"Doses of 1,000 mg per day of aspirin caused gastrointestinal symptoms and bleeding that, in some cases, were clinically significant. In the largest postinfarction study (the Aspirin Myocardial Infarction Study (AMIS) with 4,500 people), the percentage of incidences of gastrointestinal symptoms for the aspirin (1,000 mg of a standard, solid-tablet formulation) and placebo-treated subjects, respectively, were stomach pain (14.5%, 4.4%), heartburn (11.9%, 4.8%), nausea and/or vomiting (7.6%, 2.1%), hospitalization for GI disorder (4.9%, 3.5%). In the A.I. and other trials, aspirin-treated patients had increased rates of gross gastrointestinal bleeding. Symptoms and signs of gastrointestinal irritation were not significantly increased in subjects treated for unstable angina with buffered aspirin in solution. "

Daily Aspirin Linked to Steep Drop in Cancer Risk

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