Lung cancer is the second most common cancer in the United States and the leading cause of cancer death. The outcomes for lung cancer patients have improved, partly due to earlier detection through better screening approaches. However, overtreatment of lung cancers identified from screening is a concern. Moffitt Cancer Center researchers are working to improve the ability to identify patients who are at a higher risk of poor survival through radiomics, an area of science that uses imaging, such as CT scans and MRIs, to uncover tumoral patterns and characteristics that may not be easy to spot by the naked eye. Results of their newest study was published today in Cancer Biomarkers.
“Overtreatment is a serious adverse effect of cancer screening and early detection. Identifying patients that have aggressive, high-risk tumors associated with very poor survival outcomes would help oncologists decide which patients may need more aggressive treatment, such as adjuvant therapies. On the other hand, patients that have less aggressive, low-risk tumors have a better chance of cure by surgery and may not need adjuvant therapies,” explained Matthew Schabath, Ph.D., associate member of the Cancer Epidemiology Department at Moffitt.
Scientists are trying to discover biomarkers that could predict tumor behavior. This would help identify lung cancers diagnosed in lung cancer screening that should be aggressively treated from those lesions that may be slow growing and could be cured by surgery only. Many focus on biomarkers that are derived from patient tissue or blood samples; however, Moffitt researchers wanted to develop a model to differentiate patients based on radiomic features. Radiomics is the extraction of data from medical image features that can aid in cancer detection, diagnosis, disease monitoring and treatment decisions. Image features include broad characteristics such as intensity, shape, size, volume and texture. Unlike biomarkers derived from tissue or blood samples, radiomic biomarkers are collected noninvasively and reflect the entire tumor rather than just a small sample.
The Moffitt team acquired images from the National Lung Screening Trial and analyzed radiomic features of the internal and surrounding tumor area. They developed a model based on the radiomic feature of compactness and the volume doubling time of sequential patient images from baseline and the first and second follow-up. Their model divided patients into groups according to their risk of having poor outcomes. For example, the low-risk patient group had a five-year overall survival of 83.3%, while the high-risk patient group had a five-year overall survival of 25%. Similar results were observed for patients with early-stage lung cancers and for patients who were diagnosed with lung cancer at the first follow-up. The researchers also identified a volume doubling time cut-point that was able to differentiate between patients with aggressive versus low-risk tumors.
While additional studies are needed to confirm this model, the researchers hope that their findings will eventually allow physicians to differentiate patients who need to be aggressively treated from those patients who may require routine follow-up.
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