(Reuters) – With the United States spending more on healthcare than any other country — $2.5 trillion, or just over
$8,000 per capita, in 2009 — the question has long been, is it worth it? At least for spending on cancer, a controversial new
study answers with an emphatic “yes.”
Cancer
patients in the United States who were diagnosed from 1995 to 1999 lived an average 11.1 years after that, compared with 9.3
years for those in 10 countries in Europe, researchers led by health economist Tomas Philipson of the University of Chicago
reported in an analysis published Monday in the journal Health Affairs.
Those extra years came at a price. By 1999
(the last year the researchers analyzed), the United States was spending an average of $70,000 per cancer case (up 49 percent
since 1983), compared with $44,000 in Europe (up 16 percent). Using standard figures for an extra year of life, the
researchers concluded that the value of the U.S. survival gains outweighed the cost by an average $61,000 per case. The
greater spending on cancer care in the United States, they conclude, is therefore “worth it.”
Experts shown an advance
copy of the paper by Reuters argued that the tricky statistics of cancer outcomes tripped up the authors.
“This study
is pure folly,” said biostatistician Dr. Don Berry of MD Anderson Cancer Center in Houston. “It’s completely misguided and
it’s dangerous. Not only are the authors’ analyses flawed but their conclusions are also wrong.”
‘BEST HEALTHCARE
SYSTEM IN THE WORLD’
The question of how U.S. healthcare compares with healthcare systems in other wealthy countries
has become highly politicized. The 2007 film “Sicko” by activist Michael Moore compared U.S. healthcare unfavorably with
systems in Cuba, France and elsewhere. U.S.
House of Representatives Speaker John Boehner regularly claimed America has “the best healthcare system in the
world.”
Philipson is a fellow at the conservative American Enterprise Institute and at the Manhattan Institute, served
in the administration of President George W. Bush and was a healthcare adviser to Sen. John McCain’s 2008 presidential
campaign.
For the new analysis, Philipson and his colleagues analyzed the survival of cancer patients diagnosed from
1983 to 1999 with any of 13 common cancers, including breast, prostate, colorectal, and leukemias.
Survival means how
long a patient lived after being diagnosed. Philipson’s team focused in particular on survival gains; that is, how long did
patients diagnosed in later years live compared with those diagnosed earlier in the period? Such gains, they argued, show
what progress countries made in treating cancer.
While that may seem straightforward, survival data is among the most
problematic cancer statistics, Philipson’s team acknowledges. In particular, they are plagued by something called lead-time
bias.
If a tumor is diagnosed very early in its existence – if it has a long “lead time” – the patient may survive,
say, two years if the tumor is very aggressive. If an identical tumor is found in that patient’s identical twin later, the
twin will survive, say, six months. But the twins die at the same age. The first survived longer with cancer due to lead-time
bias, but did not have a longer lifetime.
Crediting medical care with “improving survival” is therefore misleading,
cancer experts have long argued. Lead-time bias makes it seem patients live longer, but the only thing that is longer is the
number of years they know they have cancer, not their lifespan.
The authors of the “worth it?” study nevertheless base
their analysis on survival data. They argue that because U.S. cancer mortality rates fell faster than those in Europe, the
survival gains must be real and not an artifact of lead-time bias.
Others call that approach fatally flawed.
“Lead-time bias is an issue,” said MD Anderson’s Berry. “I can see no hint of logic in their statement that ‘lead-time bias
did not confound our results.'”
DIFFERENCES IN SCREENING IN U.S. AND EUROPE
Even more problematic, said Berry,
is a problem cancer experts have only recently recognized: overdiagnosis. Because cancer screening is much more widespread in
the United States than in Europe, especially for breast and prostate cancer, “we find many more cancers than are found in
Europe,” he said. “These are cancers that tend to be slowly growing and many would never kill anyone.”
Screening
therefore turns thousands of healthy people into cancer patients, even though their tumor would never threaten their health
or life. Counting these cases, of which there are more in the United States than Europe, artificially inflates survival time,
experts said.
“As long as your calculation is based on survival gains, it is fundamentally misleading,” said Dr. H.
Gilbert Welch, a healthcare expert at the Dartmouth Institute for Health Policy & Clinical Practice.
In the new
analysis, the survival gains in the United States compared with Europe were greatest for prostate cancer, at more than triple
the gains for breast cancer, the cancer with the second-greatest U.S. survival edge. “These are the two cancers where
screening has raised the most serious issues about lead-time bias and overdiagnosis,” said Welch.
For melanoma and
colorectal and uterine cancer, survival gains over the period analyzed were greater in Europe than the United
States.
The Philipson team acknowledges that survival data can be misleading. They justify their approach, however, by
saying that because deaths from cancer as a percentage of a country’s population fell faster in the United States than in 10
countries in Europe from 1982 to 2005, the higher U.S. survival “suggests that lead-time bias did not confound our
results.”
Some experts in cancer statistics were not convinced.
“Why do the authors use the wrong metric –
survival – in the analysis and then argue that the right measure – mortality – provides corroborating evidence?” asked Welch.
“As long as your calculation is based on survival gains, it is fundamentally misleading.”
Other calculations cast
doubt on the superiority of U.S. cancer care. For instance, breast cancer mortality fell 36 percent in the United Kingdom
from 1990 to 2006, calculates MD Anderson’s Berry, and fell 30 percent among whites in the United States. (The U.S. figure
would be even lower, he said, if it included African-Americans, who generally have less access to health care.)
Cancer
mortality in the United States is higher than in 11 countries reporting to the Organization for Economic Co-operation and
Development, and lower than the rate in 14. Mortality is lower in Switzerland, Sweden, Japan and Finland, among others, but
higher in Hungary, Slovenia, France and
Britain, in the latest years for which OECD has data.
The reduction in cancer mortality in the United States since
2000 also puts it toward the middle of OECD countries. It is less than in Israel, Japan, Switzerland and some others, for instance, but better than in Britain,
Estonia and Poland.
THE VALUE OF MORE SPENDING
The researchers acknowledge that it is not possible to conclude
that improved survival comes from higher spending on cancer care. It might also come from more widespread cancer screening
which, experts say, detects more and more “pseudo-disease” — that is, a tumor so nonaggressive it would never have threatened
the person’s health or life. That alone would make the survival data look better.
The Philipson paper was supported
in part by Bristol-Myers Squibb Co, whose cancer drugs include Yervoy. A drug for advanced melanoma, it costs $120,000 for a
full course of treatment. Clinical trials showed that Yervoy produces a near-miraculous cure for some patients, with a median
increase in survival of 3.6 months.
U.S. spending on cancer care has continued to increase, reaching $72 billion in
2004, the last year for which data is available.
The new study did not examine the cost-effectiveness of that care.
“In the last decade, spending in the U.S. has increased more than in Europe,” said Philipson. “I would be extremely surprised
if the survival gains haven’t continued. But it is a much more open question whether that additional spending has been
accompanied by an increase in longevity.”
In the last decade, a number of very expensive cancer drugs were introduced
into the United States, including Dendreon Corp’s Provenge for prostate cancer ($93,000 per treatment) and Bristol and Eli
Lilly and Co’s Erbitux ($100,000 per year). Their analysis, say Philipson’s team, “does not imply that all treatments are
cost-effective.”
Worse, many are not medically effective. Last week, the American Society of Clinical Oncology
released a list of five cancer tests and therapies that do not help patients live longer or suffer less — even apart from how
much they cost.
VALUING OF A YEAR OF LIFE
Healthcare economists focused on a different aspect of the new study,
namely, how much each additional year of life is worth. Philipson’s team assumes a value of $150,000 to
$360,000.
“Are American taxpayers willing to pay $150,000 in added taxes to purchase an added life year for some poor
person?” asked health economist Uwe Reinhardt of Princeton University. “Does the urge to cut government spending on Medicare
and Medicaid suggest Congress is willing to purchase added life years for anyone who cannot purchase it with his or her own
money at a price of $150,000 per year?”
Other studies in the journal raise questions about the value of some aspects
of cancer care. One finds that the use of a prostate-cancer treatment called “intensity modulated radiation therapy” has
soared since 2001, including for men with low-risk forms of the disease. Since IMRT costs $15,000 to $20,000 more than other
therapies despite a lack of evidence that it improves outcomes, that raises “concerns about overtreatment, as well as
considerable health care costs,” write University of Michigan researchers.
Another study finds that urologists who
perform biopsies themselves, rather than refer patients to another physician, are more likely to perform prostate biopsies on
men who are unlikely to have prostate cancer. “These findings suggest that doctors’ own financial interests are driving
decisions to perform biopsies which are of little to no benefit to patients,” Health Affairs said in a
statement.
(Reporting By Sharon Begley and Kate Kelland; editing by Matthew Lewis)
