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New Lung Cancer Subtypes Can Lead to Personalized Therapies With Better Outcomes

By Baylor College of Medicine | October 26, 2016

Personalized therapies can potentially improve the outcomes of patients with lung cancer, but how to best design such an approach is not always clear. A team of scientists from Baylor College of Medicine and the University of Texas MD Anderson Cancer Center analyzed vast amounts of molecular data from a set of more than 1,000 non-small cell lung cancers that allowed them to break down the cancers into distinct subtypes, each with its own molecular profile and potentially different response to therapy. The results appear in Oncogene.

“People may think of lung cancer as one disease, but lung cancer is a collection of diverse subtypes of cells and each subtype may respond differently to the same therapy,” said senior author Dr. Chad Creighton, associate professor of medicine and member of the Dan L Duncan Comprehensive Cancer Center Division of Biostatistics at Baylor College of Medicine.

By using molecular data – which would inform scientists, for instance, about which genes and proteins the cancer expresses and changes in its DNA- the researchers were able to tease out the different subtypes and have a more refined system of classification for non-small cell lung cancer.

“Any two given lung cancers may have very different molecular profiles,” said Creighton. “One would have certain genes turned on and produce certain proteins while the other cancer would have different genes turned on and express different proteins. This would imply that one cancer subtype might be more vulnerable to specific therapies while the other might be more susceptible to other therapies.”

The researchers found that the tumors are complex in more than one way. They are complex because of the diversity of alterations involving tumor cells, but also in the variety of non-tumor cells that are part of the tumor microenvironment.

“One big part of the study was to try to tease out the cells in the tumor that actually are not cancer,” said Creighton. “Those cells include lymphocytes – a type of immune cell that tries to attack the cancer. Lymphocytes showed up in the tumor profile and we found out that only specific subsets of lung cancer show this really strong pattern for lymphocyte infiltration. These cancer subtypes also show evidence for immune check point pathway, which is a pathway by which cancer cells learn to evade the immune system which normally would actively attack and kill cancer cells. Many cancers have learned some ‘tricks’ so they can turn on or off specific genes or proteins that allow them to evade the immune response.”

With these types of analyses the researchers identified specific subsets of cancer cells that they think might be more responsive to immunotherapy – a therapy to boost the body’s natural defenses to fight the cancer. Immunotherapy has had a lot of success in a subset of human cancers.

“The Cancer Genome Atlas, the cancer initiative that generated these data that we analyzed, involves data for over 10,000 cancers,” said Creighton. “That information is now in the public domain and we are currently going through all of the data, not just for lung cancer, but for all the cancer types. We call this pan cancer analysis. We are trying to find features that not just apply to one type of cancer, but across multiple types. Much of our work in the next year is going to be focusing on pan cancer work that might point at ways of treating multiple types of cancer.”

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