Measuring HPV infection
HPV infection is the cause of almost all cervical cancer cases worldwide as well as a substantial proportion of other anogenital and oropharyngeal cancers. There are approximately 200 different types of the virus which can be divided into high-risk types, known to be carcinogenic, and low risk types that are associated with warts.
Three vaccines are currently available to prevent HPV-related disease: a bivalent vaccine that targets the highest-risk types, 16 and 18; a quadrivalent vaccine that targets types 16, 18 and low risk types 6 and 11; and a nonavalent vaccine that targets types 16, 18, 6, 11 and additional high risk types 31, 33, 45, 52 and 58.
The use of assays for the detection and genotyping of HPV in clinical samples is a key method for measuring disease burden and evaluating the success of vaccination strategies.
HPV assays are also important diagnostic tools. In the UK, for example, HPV testing has recently replaced conventional cytology as the primary type of investigation in the NHS cervical cancer screening programme.
Consequently, there is a well-recognised need for HPV DNA standards that help to ensure that the assays used are accurate, sensitive and specific enough to provide meaningful and comparable results.
Providing a consistent results reporting system
The new International Standards for HPV DNA can be used to harmonise the amplification and detection steps of both monoplex and multiplex NAT-based assays.
They have been assigned arbitrary International Units (IU) and are intended to act as calibrators for routinely used secondary standards providing a consistent result reporting system that is independent of the laboratory or method used.
The IU values were determined following an WHO international collaborative study involving 14 laboratories from 11 countries. Participants tested the suitability of the standards using a range of commercial and in-house semi-quantitative and qualitative assays and the overall results indicated that standards were correctly scored as positive for the target HPV genotype with no cross reactivity or contamination.
“Their use will enable global harmonisation of HPV NAT assays, thus informing vaccination policies as well as the diagnosis and treatment of HPV-related disease.”
Dr Dianna Wilkinson, Principal Scientist at the NIBSC
Dr Dianna Wilkinson, who led the collaborative study, comments that:
“The International Collaborative study demonstrated that the HPV DNA standards meet stringent WHO requirements to serve as International Standards. Their use will enable global harmonisation of HPV NAT assays, thus informing vaccination policies as well as the diagnosis and treatment of HPV-related disease.”
How to order
The International Standards are provided individually or as more economical collections of HPV types 16, 18, 6, 11 (NIBSC product code 19/224) and HPV types 31, 33, 45, 52, 58 (NIBSC product code 19/226).
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If you would like more information about our HPV DNA International Standards, please contact email@example.com.