"Medicinal Mushrooms for Cancer Survival"
Can mushrooms be medicinal? Mushroom-based products
make up a sizable chunk of the $50 billion supplement market.
This profitable trade provides a powerful incentive for companies to test
the credulity of their customers, and sadly, unsupported assertions
have come to define the medical mushroom business.
For example, companies that market herbal medicines exploit references to studies
on mice to promote their mushroom capsules
for treating all kinds of ailments,
but if you haven't noticed, we're not mice.
I mean, it wouldn't be surprising if mushrooms had some potent properties.
After all, fungi are where we got a bunch of drugs,
not the least of which, penicillin.
And also a cholesterol-lowering drug, lovastatin,
and the powerful immunosuppressant drug, cyclosporin.
Still don't think a little mushroom can have pharmacological effects?
Don't forget they can produce some of our most powerful poisons.
Some kind of look the part, like the toxic Carolina false morel,
all toadstooly and such, but others have more of an angelic look,
indeed literally called the Destroying Angel—that's its name—
and as little as a teaspoon can cause a painful, lingering death.
So anyway, we should have respect for the pharmacological potential
of mushrooms, but what can they do that's good for us?
Well, consuming shiitake mushrooms daily improves human immunity.
Giving people just one or two dried shiitake mushrooms a day—
about the weight equivalent of five to ten fresh ones—for four weeks
resulted in an increase in proliferation of gamma-delta T lymphocytes
and doubled the proliferation of natural killer cells.
Gamma-delta cells act as a first line of immunological defense,
and even better, natural killer cells kill cancer,
and the shiitake did all this while lowering markers of systemic inflammation.
Oyster mushroom extracts don't seem to work as well, but what we care about
is if mushrooms can actually affect cancer outcomes.
Shiitakes haven't been tried yet, but reishi mushrooms have,
after being used as a cancer treatment throughout Asia for centuries.
Reishi mushroom for cancer treatment: what does the science say?
A meta-analysis of five randomized controlled trials showed that patients
who had been given reishi mushroom supplements along with chemo and
radiation were more likely to respond positively compared
to just chemo and radiation alone. Now although adding a reishi mushroom
extract improved tumor response rates, the data failed to demonstrate
a significant effect on tumor shrinkage when the mushrooms were used alone.
So they aren't recommended as a single treatment,
but rather an adjunct treatment for patients with advanced cancer.
Now response rate just means the tumor shrinks.
What we care about is whether or not it actually improves
survival or quality of life. And we don't have convincing data
suggesting reishi mushroom products improve survival.
But those randomized to reishi were found to have
a relatively better quality of life, so that's a win as far as I'm concerned.
What about other mushrooms?
Although whole shiitake mushrooms haven't been tested yet,
there's a compound that's extracted from shiitakes called lentinan,
which is said to have completely inhibited the growth
of a certain kind of sarcoma in mice. But in actuality it only worked
in one single strain of mice and failed in nine others.
So are we more like the 90% of mouse strains in which it didn't work?
We need human trials, and we finally got them.
There are data on nearly 10,000 cancer patients who have been treated
with the shiitake mushroom extract injected right into their veins.
What did the researchers find? We'll find out next.