Using imaging to characterize the genetic makeup of tumors may pave the way for individualized, non-invasive treatment—and could predict a woman’s chance of breast cancer recurrence 10 years down the road, researchers report.
Diverse diseases like breast cancer can present challenges for clinicians, specifically on a cellular level. While one patient’s tumor may differ from another’s, the cells within the tumor of a single patient can also vary greatly. This can cause problems, considering that an examination of a tumor usually relies on a biopsy, which only captures a small sample of the cells.
“We’ve just touched the tip of the iceberg.”
Magnetic resonance imaging (MRI) and an emerging field of medicine called radiomics—which uses algorithms to extract a large amount of features from medical images—could help characterize the heterogeneity of cancer cells within a tumor and allow for a better understanding of the causes and progression of a person’s individual disease, according to the paper in Clinical Cancer Research.
“If we’re only taking out a little piece of a tissue from one part of a tumor, that does not give the full picture of a person’s disease and of his or her response to specific therapies,” says principal investigator Despina Kontos, an associate professor of radiology in the Perelman School of Medicine at the University of Pennsylvania.
“We know that in a lot of instances, patients are overtreated, getting therapy that may not be beneficial. Or, conversely, patients who need more aggressive therapy may not end up receiving it. The method we currently have for choosing the appropriate treatment for patients with breast cancer is not perfect, so the more steps we can take toward more personalized treatment approaches, the better.”
Less invasive look at breast cancer
Kontos and her colleagues wanted to determine whether they could use imaging and radiomics for more personalized tumor characterization. Using MRI, the researchers extracted 60 radiomic features, or biomarkers, from 95 women with primary invasive breast cancer. After following up with the patients 10 years later, the group found that a scan that showed high tumor heterogeneity at the time of diagnosis—meaning a high diversity of cells—could successfully predict a cancer recurrence.
“Our study shows that imaging has the potential to capture the whole tumor’s behavior without doing a procedure that is invasive or limited by sampling error,” says lead author Rhea Chitalia, a PhD candidate in the School of Engineering and Applied Science. “Women who had more heterogeneous tumors tended to have a greater risk of tumor recurrence.”
The researchers retrospectively analyzed patient scans from a 2002-2006 clinical trial conducted at Penn Medicine. For each woman, the group generated a “signal enhancement ratio” (SER) map and extracted from it various imaging features in order to understand the relationship between those features and conventional biomarkers (such as gene mutations or hormone receptor status) and patient outcomes.
They found that their algorithm successfully predicted recurrence-free survival after 10 years. To validate the findings, the group compared their results to an independent sample of 163 patients with breast cancer from the publicly available Cancer Imaging Archive.
Adding to the ‘gold standard’ of care
While imaging may not completely replace the need for tumor biopsies, radiologic methods could augment what is currently the “gold standard” of care, Kontos says, by giving a more detailed profile of a patient’s disease and guiding personalized treatment.
Next steps for the research team will include expanding the analysis to a larger patient cohort and also further exploring which specific markers are more predictive of particular outcomes.
“We’ve just touched the tip of the iceberg,” Kontos says “Our results and the validation study give us confidence that there are many opportunities for these markers to be used in a prognostic and potentially a predictive setting.”
The National Cancer Institute at the National Institutes of Health funded the work.