H
|
eart disease has long been the
leading cause of death. However, a new global study has shown — in higher
income countries, at least — that cancer is now twice as likely to cause death
as heart disease.
A
recent study offers important insights into the leading causes of death
worldwide.
In
the United States, heart disease has
traditionally topped the list as the leading cause of death for both men and
women.
It
is currently responsible for around 1 in 4 deaths.
However, experts have been wondering when cancer will overtake it.
Now,
a new study has found that cancer is fast becoming the leading cause of death
in higher income countries.
This
may seem like bad news, but the researchers behind the study — who investigated
the occurrence of common conditions and causes of death in a wide spectrum of
countries across the world — say that it is not necessarily so.
More
specifically, they found that cancer now causes 55% of deaths among middle aged
people in higher income countries, whereas heart disease causes just 23%.
The
researchers, who have published their findings in The Lancet, say that this
is due to improved efforts to prevent and treat heart disease in more
prosperous countries.
"In
some respects, this is a good news story," says co-lead study author Dr.
Darryl Leong. "It suggests that efforts to treat blood pressure, cholesterol, and cardiovascular disease
are meeting with some success."
Prevalence declining but more work needed
The SEER Cancer Statistics Review for 2018 noted a 26% drop
in cancer-related deaths in the U.S. between 1991 and 2015.
Although
this shows progress, there is still much work to be done, according to
the National Cancer Institute. For example, the number of people
smoking may have declined, but obesity is on the rise and the U.S.
population is aging. All of these factors impact cancer statistics.
"Whether
or not cancer rates are increasing is a complex question with no easy
answer," Dr. Leong told Medical
News Today. He heads the Cardio-Oncology Program at McMaster University
and is affiliated with Hamilton Health Sciences in Canada.
"Different
cancers have different patterns; cancer diagnosis rates depend in part on the
use of screening tests in different populations; aging populations also affect
the risk of developing cancer at a population level."
In
their Prospective Urban Rural Epidemiology study, Dr. Leong and colleagues set
out to get an up-to-date understanding of which conditions are the most
significant threats to middle aged adults across the globe.
A study into current major health threats
The
researchers conducted their study in 21 countries across five continents. The
Population Health Research Institute of McMaster University and Hamilton Health
Sciences headed up the project.
Over
9.5 years, the team followed 162,534 adults, ages 35–70, from:
·
high income Canada, Saudi Arabia,
Sweden, and the United Arab Emirates
·
middle income Argentina, Brazil,
Chile, China, Columbia, Iran, Malaysia, Palestine, the Philippines, Poland,
Turkey, and South Africa
·
low income Bangladesh, India,
Pakistan, Tanzania, and Zimbabwe
The researchers revealed that although heart disease
is no longer the biggest killer in higher income countries, it remains the most
common cause of death worldwide.
In
middle income countries, heart disease was responsible for 41% of deaths, and
in lower income countries, it was responsible for 43% of deaths. This is
despite the risk factors that wealthier populations have.
Cancer
ranked second most common, at 26%. However, although cancer was responsible for
55% of deaths in high income countries, this dropped to 30% in middle income
countries and 15% in lower income countries.
The
prediction is that as other countries start or continue to tackle the
prevention and treatment of heart disease, cancer is likely to become the
world's leading cause of death.
When
the team took cancer out of the findings, overall mortality was highest in the
low income countries (13.3%) and lowest in high income countries (3.4%), the
former of which the researchers put down to reduced access to quality
healthcare.
Clinical implications of the findings
This
was the first time that researchers in this field have collected data in a
global standardized study. It allowed them to compare "apples with
apples."
"We
collected information from participants in a standardized way, which allows us
to compare different populations, whereas other studies might not be able to
make these comparisons with as much confidence," Dr. Leong told us.
"We felt that there were unique aspects to our data."
As
for the clinical implications:
"With individuals surviving
longer with cardiovascular disease, especially in high income countries, the
development of other health issues, including cancer, will be a growing
problem."
Dr. Darryl
Leong
The
answer, say the researchers, is to continue to prevent and treat heart disease
while bumping up efforts to fight cancer.
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