Lung Cancer Section
What is comprehensive biomarker testing and who should order it? For non–small cell lung cancer, comprehensive biomarker testing is generally defined as testing eligible patients for all biomarkers that direct the use of FDA-approved therapies (Mileham KF, et al. Cancer Med. 2022;11[2]:530. What comprises comprehensive testing has changed over time and will likely continue to change as advances in biomarkers, therapies, and indications for their use continue to evolve. There are also some potential benefits to testing biomarkers without FDA-approved therapies, such as assessing eligibility for treatment as part of a clinical trial or for identifying treatment options that gain FDA-approval in the future. As for who should be responsible for biomarker test ordering, this remains unclear and variable between institutions and practices (Fox AH, et al. Chest. 2021;160[6]:2293). All subspecialties involved, including pulmonology, pathology, interventional radiology, surgery, and oncology, have the potential for knowledge gaps surrounding biomarker testing (Gregg JP, et al. Transl Lung Cancer Res. 2019;8[3]:286; Smeltzer MP, et al. J Thorac Oncol. 2020;15[9]:1434). Those obtaining diagnostic tissue, including pulmonologists, surgeons, and interventional radiologists may not appreciate the downstream use of each biomarker but are in the place to order testing as soon as the time of biopsy. Pathologists may be unaware of clinical aspects to the patient’s case, such as the suspected clinical stage of disease. Oncologists arguably have the best chance of having the expertise to order testing but, ideally, biomarker results would be available by the time a patient meets with an oncologist to discuss treatment options. There is no perfect solution to this question at present, but if you are involved with the diagnosis of lung cancer, you should collaborate with your multidisciplinary team to streamline testing and strategize how to best serve patients.
Adam Fox, MD
Section Fellow-in-Training