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Wednesday, May 13, 2009

Nobel Laureate: Harald zur Hausen


The Nobel Prize in Physiology or Medicine 2008

"for his discovery of human papilloma viruses causing cervical cancer"

Harald zur Hausen (1936 - ) won the Noble Prize in 2008 for discovering that a virus, human papilloma virus, causes cervical cancer. He also won a Gairdner Award in 2008.

Zur Hausen's discovery led eventually to the development of an HPV vaccine. Gardasil is the best known of the two vaccines on the market. Most doctors recommend that young girls be vaccinated.

Here's the 2008 press release on Zur Hausen.
Nobel Laureates
Discovery of human papilloma virus causing cervical cancer

Against the prevailing view during the 1970s, Harald zur Hausen postulated a role for human papilloma virus (HPV) in cervical cancer. He assumed that the tumour cells, if they contained an oncogenic virus, should harbour viral DNA integrated into their genomes. The HPV genes promoting cell proliferation should therefore be detectable by specifically searching tumour cells for such viral DNA. Harald zur Hausen pursued this idea for over 10 years by searching for different HPV types, a search made difficult by the fact that only parts of the viral DNA were integrated into the host genome. He found novel HPV-DNA in cervix cancer biopsies, and thus discovered the new, tumourigenic HPV16 type in 1983. In 1984, he cloned HPV16 and 18 from patients with cervical cancer. The HPV types 16 and 18 were consistently found in about 70% of cervical cancer biopsies throughout the world.

Importance of the HPV discovery

The global public health burden attributable to human papilloma viruses is considerable. More than 5% of all cancers worldwide are caused by persistent infection with this virus. Infection by the human papilloma virus is the most common sexually transmitted agent, afflicting 50-80% of the population. Of the more than 100 HPV types known, about 40 infect the genital tract, and 15 of these put women at high risk for cervical cancer. In addition, HPV is found in some vulval, penile, oral and other cancers. Human papilloma virus can be detected in 99.7% of women with histologically confirmed cervical cancer, affecting some 500,000 women per year.

Harald zur Hausen demonstrated novel properties of HPV that have led to an understanding of mechanisms for papilloma virus-induced carcinogenesis and the predisposing factors for viral persistence and cellular transformation. He made HPV16 and 18 available to the scientific community. Vaccines were ultimately developed that provide ≥95 % protection from infection by the high risk HPV16 and 18 types. The vaccines may also reduce the need for surgery and the global burden of cervical cancer.

[Photo Credit: IBMLive]

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1 comment :

  1. Dr Hausen, with the discovery of HPV as agent responsible for Cervical cancer, open the possibilities to explore the various other cancers in which infectious organism may have a role to play.
    The days are nor far off when either we will able to screen all those who are susceptible to cancer but also protect the at risk individuals by vaccination.