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Medical Forum / Diseases and Disorders / Prostate Cancer / March 2006

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Treating elderly men right after diagnosis is better than the WW

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c palmer - 22 Mar 2006 22:43 GMT
Treating elderly men right after diagnosis is better than the current
'watchful waiting'

A New View on Prostate Cancer
Treating elderly men right after diagnosis is better than the current
'watchful waiting' approach, a study indicates.

By Thomas H. Maugh II, Times Staff Writer

Los Angeles Times
February 26 2006

It is better to treat prostate cancer in the elderly early on rather
than to wait and watch for signs of progression, as is now commonly
done, according to a new study that may change the care for many
patients with the deadly disorder.
Surgery or radiation therapy in elderly men increases survival by at
least 30%, raising median survival times from 10 years to more than 13
years, researchers reported Saturday at a prostate symposium in San
Francisco.
The finding in a study of about 49,000 men "challenges long-held beliefs
about prostate cancer treatment" by suggesting that treatment is better
than so-called watchful waiting, said Dr. Paul Lange of the University
of Washington, who did not participate in the study.
"It's a wonderful paper that validates what many of us have believed for
a long time," said Dr. Mark Kawachi, director of the prostate cancer
center at City of Hope National Medical Center in Duarte.
"Age, in and of itself, is not a definitive determinant of whether you
should be excluded from treatment" for prostate cancer, he said.
Prostate cancer is the most common type of cancer among men, with about
235,000 new cases diagnosed in the United States this year and about
27,000 deaths, according to the American Cancer Society.
It is primarily a disease of the elderly, with about two-thirds of those
afflicted over age 65.
But there is an "incredible controversy" over how to treat those older
patients, said Dr. Yu-Ning Wong of the Fox Chase Cancer Center in
Philadelphia, who led the new study.
Although it is clearly beneficial to treat younger men with the disease,
many oncologists put off treatment of older ones on the assumption that
most prostate cancers are slow growing. They reason that the afflicted
individual is likely to die from some other cause before the prostate
cancer becomes serious. Wong's study is the first to compare treatment
and no treatment in this age group. It is an observational study, so its
results cannot be considered definitive, but the findings should provide
guidance to physicians and patients who are unsure about how to proceed.
"There is a misconception that prostate cancer is universally an
innocuous disease of the elderly," said Dr. Howard Scher, chief of
genitourinary oncology at the Sloan-Kettering Memorial Cancer Center in
New York. With Wong's and other studies, "we are clearly seeing that is
not the case."
Wong's team studied Medicare records for 48,606 men age 65 to 80 who had
survived for a year after a prostate cancer diagnosis. All were
diagnosed between 1991 and 1999, with a median age of 72 at diagnosis.
A total of 19,948 men received radiation therapy, 14,098 underwent
surgery and the remaining 14,560 were simply observed.
Wong reported Saturday that 27% of the men in the watchful waiting group
were still alive, with a median survival time " the period in which half
the patients died  of 10 years. In contrast, 59% of those who received
either surgery or radiation therapy were still alive, with a median
survival time of 13 years and growing.
The benefit of treatment was apparent even among men who were 75 to 80
at the time of diagnosis.
Radiation and surgery seemed to be equally effective in all age groups,
she said.
The study results were "optimistic," she said. "It is nice to know that
what we have been doing for people is probably helping them."
Critics said the findings might be biased somewhat because the
researchers had no way of determining whether the prostate cancer
patients may have had some other medical problem that precluded
treatment for their cancer.
Wong said, however, that, even if allowance for the possibility of bias
is made, "there is clearly a survival advantage associated with
treatment."
Kawachi said the study did not examine the potential side effects and
complications of treatment, which may include urinary incontinence and
sexual dysfunction, among other things.
It's possible, he said, that some patients may live longer, but with a
diminished quality of life.
If the patient is excessively concerned about those potential
complications, "you have to wonder whether it is in the patient's best
interest to undergo treatment."
But, he said, as treatments improve and the risk of complications
diminishes, "then I think more of the older patient population can
appreciate and enjoy the survival advantage offered by treating prostate
cancer."
Full story Los Angeles times, Feb 26, 2006

knowledge is power - growing old is mandatory - growing wise is optional    
"Many more men die with prostate cancer than of it. Growing old is
invariably fatal. Prostate cancer is only sometimes so."
http://community.webtv.net/PALMER_ENT/doc
Leonard Evens - 23 Mar 2006 05:37 GMT
> Treating elderly men right after diagnosis is better than the current
> 'watchful waiting'

A couple of comments about this report.

First, doctors don't use simple chronological age in deciding whether or
not to treat early prostate cancer aggressively.  Or, at least they
shouldn't.  It is life expectancy.  The current treatment protocols
adopted by urologists specify that such treatment is warranted if the
expected lifetime of the patient is 10 years or more.

Second, although the results of this study are interesting, they are not
definitive.  The problem is that the men who chose watchful waiting may
have been more likely to die in the first place.  Something of that
nature is called by statisticians a confounder.  The way to eliminate
confounders is to pick a population of men and randomly assign half of
them either surgery or radiation and the other half WW.  Also, this has
to be done so that in all other ways the men in the two groups have the
same characteristics.  Unfortunately, even this is hard to do.  For
example, unless the treatment given the men in the first group is
effective, that group may end up not doing better than the WW group.

I think the upshot of all of this is that each study provides some
eidence one way or another.   Randomized studies are generally more
reliable, but they also shouldn't be taken as the last word.  We hope
that after enough studies have been done, it becomes clear just what the
facts are.

> A New View on Prostate Cancer
> Treating elderly men right after diagnosis is better than the current
[quoted text clipped - 84 lines]
> invariably fatal. Prostate cancer is only sometimes so."
> http://community.webtv.net/PALMER_ENT/doc
Bill - 23 Mar 2006 17:03 GMT
I don't know why they would even waste their time on a study w/ a, as
Leonard identifies, confounder that is a deal-killer IMO. They
apparently did not even take into account whether the men who were dead
died of PCa! We all know that an "elderly" man who has had a couple of
heart attacks and is in poor health is more apt to choose WW than the
same age man in the picture of health. Is it surprising that more of
the former are dead in 10 years than the latter? Geez, that goes w/o
saying. Study something we don't know.

Bill Denton
RP 2/12/02
PSA .67
Memphis
Alan Meyer - 23 Mar 2006 22:16 GMT
> I don't know why they would even waste their time on a study w/ a, as
> Leonard identifies, confounder that is a deal-killer IMO. They
[quoted text clipped - 9 lines]
> PSA .67
> Memphis

Bill,

I think your point, and Leonard's, is well taken.  However if I'm
reading the abstract correctly, the author of the study did make
some attempts to take these criticisms into account.

I notice two things that he did.  First, he threw out all cases
where the patient lived less than one year after diagnosis.
That should eliminate the most blatant cases of watchful
waiting prescribed because the patient looks like he's dying
of something else.

It would be interesting to see if his numbers change if he
were to throw out, say, all patients who died within three
years on the theory that it would be unusual for a man
who could benefit from treatment to die within 3 years of
diagnosis.  Those who did die in 3 years might either have
been the men close to death for other reasons, or the
men with advanced cancer.

Secondly, he apparently did some age matching because
he claimed that his results held true for all ages.  If WW
really is better for older men, we would expect to see equal
or better performance for older men on WW than similarly
aged men who opted for treatment.  It might be equal if
treatment didn't help and might be better for WW if treatment
not only didn't help but also put more stress on aged bodies.

So, although he hasn't proven anything, it seems to me that
he has cast doubt on the theory that older men should not
be offered treatment.  He has at least shown that it's not a
slam dunk case against treatment - as was apparently assumed
by some doctors and perhaps by some insurers.

   Alan
Bill - 24 Mar 2006 16:35 GMT
But, Alan, if he did not identify who died of what when, could not the
conclusion just as well be that men who are considered in bad health
generally live longer than expected? This may in fact be a testament to
medical advances w/ other diseases and have nothing to do w/ PCa. What
I want to know is their post-Dx PCa history.

Bill Denton
RP 2/12/02
PSA .67
Memphis
 
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