Incidence of Liver Cancer Expected to Climb as Hepatitis C Progresses
Death, according to the experts, will come from the progression of the
disease, first to cirrhosis, a severe disease of the liver that prevents normal
functioning and body metabolism, and then to liver cancer, known in the medical
world as hepatocellular carcinoma (HCC). Either one of these progressive
patterns may result in bodily dysfunction and death.
Once considered a rare disease in the U.S., the CDC now predicts hepatitis
C-associated mortality will increase two- to threefold.
John B. Wong, MD, chief of the division of clinical decision making at the
New England Medical Center at Tufts University School of Medicine in Boston,
tells WebMD that he used a computer model to check predictions issued last year
by the CDC. "Our model confirmed the CDC estimate. We predict that 208,000
Americans will die as a result of HCV in the years 2010-2019," he says.
The price tag for hepatitis C during the decade 2010-2019 will be about $82
billion, says Wong. That prediction is based on estimates of approximately $10
billion in treatment costs and $71 billion in lost productivity.
Wong points out that hepatitis C is a "viral infection with a very long
lag time from exposure to progression." The natural history of the disease
takes it from fibrosis to cirrhosis to -- for those who don't die from
cirrhosis -- to HCC, he says. "Our study predicts that 181,300 deaths will
occur from HCV-related cirrhosis and 27,200 from HCV-related HCC."
That prediction is echoed by Masashi Mizokami, MD, who is a professor of
medicine at the Nagoya City University Medical School in Japan. Mizokami tells
WebMD that hepatitis C infection began to diverge in Japan around 1945. The
virus is most efficiently transmitted by intravenous drug use, says
During World War II, the military government of Japan introduced
methamphetamine to the soldiers to increase the 'fighting spirit.' As a result,
intravenous use of methamphetamine grew steadily from the mid-1940s to the
1950s, he says. In the U.S., use of intravenous drug use became prevalent in
the 1960s, so Mizokami refers to the year 1965 as the date for initial
divergence of hepatitis C in the U.S. and 1945 for divergence in Japan.
Hepatitis C progresses for about 30 years, according to Mizokami, "and I
think this explains the difference in prevalence of HCC between Japan and the
U.S.," he says. Although the incidence of hepatitis C is virtually the same
in the U.S. and Japan, the incidence of HCC is eight times greater in Japan, he
In Japan, the incidence of "HCC began to climb in 1975," Mizokami
says. He notes that "in 1995, the incidence of cirrhosis in the U.S. began
to climb, and it appears that this will signal the beginning of the same
pattern seen in Japan," he says.
Since combination therapy with the drugs interferon and ribavirin can
achieve a response in 40-50% of patients with hepatitis C, WebMD asked Mizokami
if treatment would alter the future path of the disease in the U.S. "We
don't know," he says. "We have only had the combination available since
1997, so it is too early to predict."