A new human papillomavirus (HPV) test, Qiagen’s
low-cost test CareHPV, designed to be used in rural areas of developing world,
was 90 percent accurate in detecting cervical cancer in women aged 30-54 in
rural areas of eastern China.
The findings were published in The Lancet
Oncology and researchers said the rapid test could help cut mortality risk from
this disease in the developing world. In the developed countries, Pap test is
the standard screen for cervical disease, supplemented by HPV testing. Pap
smear screening can identify potentially precancerous changes. The wide spread
use of cervical screening programs has reduce the incidence of invasive
cervical cancer by 50%. But both techniques require “a level of infrastructure
unattainable in most of the developing world,” the researchers said. These
tests are expensive, require special equipment and access to sophisticated labs.
“The idea of replicating that in the developing world, where resources are
scare, doesn’t make sense,” said Linda Alexander, Qiagen’s vice president of
women’s health and global advocacy.
Thus, the most common cervical cancer
screening tool in rural areas has been a procedure in which the woman’s cervix
is painted with vinegar to highlight abnormalities. She is then visually
examined by a doctor or a nurse. But the method which uses acetic acid (VIA) misses
a significant number of women with cervical disease who need treatment.
In the study, researchers found the ability
of this procedure to identify women who have cervical cancer in early or
advanced stages was 41 percent. The trial involved 2,388 women in Shanxi in Eastern China.
Qiagen’s rapid HPV test was 90 percent
accurate in detecting cervical cancer, compared to Pap testing (cytology), for
which the sensitivity was 85 percent. “The ability of the careHPV test to
detect precancerous cells was found to be 90 percent; 84.2 percent of the women
without precancerous disease were identified as negative by the test,” the
researchers said in a statement.
The careHPV test can detect 14 types of
humanpapillomavirus in around 2 and a half hours; it does nor require mains
electricity or running water and can be used by non-technical support staff. It
gives rapid and accurate results.
“If women 30 years and older could be
screened at least once in their lifetimes with such a test, and appropriate
treatment administered at the same visit, public-health programs would be
affordable and deaths from cervical cancer would be reduced by a third,” John
Sellors of McMaster University in Hamilton, Ontario, one of the study’s authors
said. He said the results were “very promising.”
Cervical cancer affects nearly 5,000,000
women around the world every year and more than 270,000 women die from cervical
cancer each year. 493,000 new cases are diagnosed each year, more than 80
percent of them in developing countries. The most important risk factor in the
development of cervical cancer is the infection with a high-risk strain of
humanpapillomavirus. Three types of HPV are generally acknowledged to cause
about 70 percent of cervical cancer cases.
The funding for the China study was
received from the Bill and Melinda Gates Foundation.