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Roadmap to more personalized cancer treatment

Date:
December 22, 2016
Source:
University of California, Los Angeles (UCLA), Health Sciences
Summary:
People with advanced head and neck squamous cell carcinoma and the KRAS-variant inherited genetic mutation have significantly improved survival when given a short course of the drug cetuximab in combination with standard chemotherapy and radiation, research has found.
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Researchers have found that people with advanced head and neck squamous cell carcinoma and the KRAS-variant inherited genetic mutation have significantly improved survival when given a short course of the drug cetuximab in combination with standard chemotherapy and radiation.

The study was led by UCLA's Jonsson Comprehensive Cancer Center member Dr. Joanne Weidhaas in collaboration with colleagues at the NRG Oncology RTOG. They discovered that people with both head and neck squamous cell carcinoma and the KRAS-variant who were treated with standard treatment, but not with cetuximab, had a higher risk of failing treatment and developing metastatic disease, meaning the cancer spreads to distant organs and is incurable.

In 2006, researchers discovered the KRAS-variant, an inherited genetic mutation found in up to 25 percent of people with cancer. The KRAS-variant is a biomarker that disrupts a class of important regulators, called microRNAs, which were discovered in 2000. The mutation has been shown to predict response to cancer therapy for many cancers, including head and neck cancer. It was not previously understood exactly how this biomarker worked.

The current standard of care for advanced head and neck squamous cell carcinoma involves chemotherapy and radiation. However, this approach typically results in a 50 percent treatment failure. Cetuximab is a monoclonal antibody that was previously shown to be beneficial for these patients when combined with radiation and chemotherapy. Yet a randomized phase 3 trial was unable to identify those who benefited from cetuximab.

Weidhaas' team analyzed available samples from NRG Oncology RTOG of a randomized phase 3 clinical trial of cetuximab in combination with chemotherapy and radiation therapy. The researchers accessed 413 biological samples from participants in the trial. Although the sample size was not large, they found a significant benefit of cetuximab treatment for all people with the KRAS-variant. Furthermore, the team found that cetuximab may in fact be working by helping the immune system of people with the KRAS-variant better fight their cancer.

This is the first evidence that the KRAS-variant can predict response to radiation, and that individuals with the KRAS-variant may have an altered immune system. This likely explains both elevated cancer risk as well as benefit from cetuximab for these individuals. The results also indicate the KRAS-variant's potential to identify people who will respond differently to therapies that depend on the immune response. Weidhaas said that using the KRAS-variant and biomarkers like it to personalize radiation therapy as well as developing immune therapies for all cancer is very promising.


Story Source:

Materials provided by University of California, Los Angeles (UCLA), Health Sciences. Original written by Reggie Kumar. Note: Content may be edited for style and length.


Journal Reference:

  1. Joanne B. Weidhaas, MD, PhD et al. The KRAS-Variant and Cetuximab Response in Head and Neck Squamous Cell Cancer: A Secondary Analysis of a Randomized Clinical Trial. JAMA Oncology, December 2016 DOI: 10.1001/jamaoncol.2016.5478

Cite This Page:

University of California, Los Angeles (UCLA), Health Sciences. "Roadmap to more personalized cancer treatment." ScienceDaily. ScienceDaily, 22 December 2016. <www.sciencedaily.com/releases/2016/12/161222130420.htm>.
University of California, Los Angeles (UCLA), Health Sciences. (2016, December 22). Roadmap to more personalized cancer treatment. ScienceDaily. Retrieved May 24, 2017 from www.sciencedaily.com/releases/2016/12/161222130420.htm
University of California, Los Angeles (UCLA), Health Sciences. "Roadmap to more personalized cancer treatment." ScienceDaily. www.sciencedaily.com/releases/2016/12/161222130420.htm (accessed May 24, 2017).

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