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Head-to-Head Study of Cervical Cancer Vaccines To Be Initiated

PHILADELPHIA, Jan. 18 /PRNewswire-FirstCall/ -- GlaxoSmithKline (NYSE: GSK - News) announced today the initiation of the first study of its kind designed to compare the immunogenicity of its cervical cancer candidate vaccine, CERVARIX®, versus Gardasil®. The primary objective of the head-to-head trial is to compare the immune responses to HPV types 16 and 18 in U.S. women 18 to 26-years-old. Secondary objectives include evaluating the immune responses to HPV 16 and 18 in women 27 to 35-years-old and 36 to 45-years-old. In addition, the study will compare immune responses to other cancer-causing HPV types. Initial study results are anticipated 12 months after study enrollment is completed, and extended follow up will continue for another 17 months.

"Vaccination to prevent cervical cancer may be the most significant healthcare breakthrough for women in our lifetime," said Dr. Mark M. Blatter, Medical Director of Primary Physicians Research in Pittsburgh, PA and study investigator. "This unprecedented trial, which will enroll more than 1,000 women, will provide the first scientific evidence to demonstrate how the two vaccines differ with respect to inducing strong and sustained immune responses in women who may be appropriate for vaccination."

Data published in Vaccine in August 2006 demonstrated GSK's cervical cancer candidate vaccine, formulated with the proprietary adjuvant system AS04, induced higher antibody levels and more robust immune memory response compared to the same HPV vaccine composition conventionally formulated with aluminum hydroxide adjuvant alone. Furthermore, data published in The Lancet in April 2006 provided evidence that GSK's cervical cancer candidate vaccine demonstrated protection up to 4.5 years against persistent infection with HPV 16 and HPV 18 — the two most common cancer-causing HPV types — and protection from pre-cancerous lesions. Protection was also demonstrated against infection with the third and fourth most prevalent cancer-causing types of HPV, namely types 45 and 31. Collectively, HPV types 16, 18, 45 and 31 are responsible for approximately 80 percent of cervical cancer cases globally.

"GSK is focused on protecting women from cervical cancer, a devastating disease that often strikes women in the prime of their lives," said Gary Dubin, Vice President, HPV Vaccines, GlaxoSmithKline. "By conducting this study, we hope to further the scientific understanding of the role of strong and sustained immune responses to HPV vaccination for the benefit of all women."

About the Study
This is a Phase III, randomized, observer-blind, multicenter study, to be conducted among 1,042 patients in the United States. There will be two arms of the study, one arm receiving GSK's cervical cancer candidate vaccine, one arm receiving Gardasil®, and each arm will be stratified by age (18-26 [n=374], 27-35 [n=334], 36-45 [n=334]). The primary objective of the study is to compare GSK's cervical cancer candidate vaccine to Gardasil®, in terms of immune responses to the two most common cancer-causing HPV types 16 and 18, which are responsible for at least 70 percent of all cervical cancers worldwide, in adult women aged 18 to 26. Secondary objectives will assess immune responses to cancer-causing HPV types 16 and 18 in adult women aged 27 to 35, and 36 to 45 as well as evaluate immune responses to other cancer-causing HPV types. Results are expected 12 months after patient enrollment is complete, with extended follow up continuing for approximately 17 months after the last study visit (month 7 through month 24).

About Cervical Cancer
The American Cancer Society estimates that in 2006, nearly 10,000 women were diagnosed with cervical cancer and nearly 4,000 died from this disease in the Unites States in a single year. After breast cancer, cervical cancer is the second most frequently occurring cancer in women ages 20 to 39 in the United States.

Source: GlaxoSmithKline

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