To improve outcomes for non-small cell lung cancer (NSCLC), researchers are developing a blood test to detect lung cancer earlier in the disease. A study published in The Journal of Molecular Diagnostics describes a new technology, electric field-induced release and measurement (EFIRM), that is both highly sensitive and specific in detecting two EGFR mutations associated with lung cancer in the blood of NSCLC patients with early-stage disease (2018; doi:10.1016/j.jmoldx.2018.06.008). This platform is relatively inexpensive and capable of high-throughput testing.
Despite advances in chemotherapy, 5-year survival for patients diagnosed with unresectable NSCLC is less than 10 percent. The ability to diagnose NSCLC in stages I and II, when surgical resection and potential cure are still possible, could significantly reduce the mortality from NSCLC worldwide.
"The EFIRM technology is the most exciting development in noninvasive liquid biopsy in recent years. The potential to detect early-stage lung cancer patients with an affordable blood or saliva test could save thousands to tens of thousands of lives annually worldwide," stated Charles M. Strom, MD, PhD, Co-Director of the Center for Oral/Head and Neck Oncology Research at the UCLA School of Dentistry. The EFIRM technology can also be used to monitor treatment and detect recurrence in patients already diagnosed with NSCLC.
Previously, the investigators had successfully measured two actionable EGFR mutations (p.L858R and exon 19 del) in blood samples from patients with late-stage NSCLC using EFIRM technology. In the current study, they investigated whether the mutations could be found in samples from patients with early-stage disease.
The researchers collected plasma samples from 248 patients with radiographically determined pulmonary nodules. Of those, 44 were diagnosed with stage I or stage II NSCLC (23 with biopsy-proven benign pulmonary nodules and 21 with stage I or stage II adenocarcinoma). EFIRM was able to detect the p.L858R mutation in 11 of 12 samples and the exon 19 del mutation in seven of nine samples, resulting in greater than 90 percent sensitivity and 80 percent specificity.
"Currently, the clinical sensitivity of EFIRM to detect patients with NSCLC is limited by the percentage of tumors containing either or both of the two variants, which is estimated at 27 percent of NSCLC tumors," explained co-investigator Wu-Chou Su, MD, of the Department of Internal Medicine, National Cheng Kung University Hospital and College of Medicine of the National Cheng Kung University, Tainan, Taiwan. "We are presently developing a 10-variant panel that contains detecting mutations expressed in 50 percent of all lung malignancies."
Investigators emphasize that this study does not present direct evidence that detecting EGFR mutations in the plasma of an individual is predictive that the patient has cancer. Future work will explore whether finding an EGFR mutation in the circulation has any predictive value. Currently, the EFIRM liquid biopsy may be helpful for guiding treatment selection in patients for whom biopsy material is not available.
"We are gratified by the performance of the EFIRM platform in patients whose tumors were still small enough to qualify for surgical care," Strom noted. "Work is underway to increase the number of mutations analyzed and to automate the process to increase sensitivity and facilitate mass screening."