Use of molecular NGS vs single gene testing differs by clinical setting and physician's specialty in mNSCLC management

e18547 Background: Genomic profiling is an important entrée to Precision Medicine (PM) therapies for treating metastatic non-small cell lung cancer (mNSCLC) with 16 new PM therapies approved since 2018, and 10 advancing from second (2L) to the first (1L) line. However, absent or suboptimal predictive biomarker testing leads to patients not benefiting from appropriate PM treatments (64% inappropriate; Sadik et al., 2022). Disparities in testing practices and perceptions remain when considering Next Generation Sequencing (NGS) versus Single Gene (SG) testing. We hypothesized that testing rates are associated with physician’s specialty/clinical setting, and assessed this in real-world data for USA mNSCLC patients. Methods: The DXRX database contains real-world claims and laboratory data covering 60% of USA mNSCLC population (Surveillance, Epidemiology, and Results program - SEER comparison). NGS and SG testing rates for newly diagnosed (1L) and 2L mNSCLC patients (~186K patients from 2018 to 2021) were evaluated by physician specialty and affiliation (self-populated on National Plan and Provider Enumeration System - NPPES). Oncologists and Pathologists referred 63% and 15% of the patients respectively. Results: Oncologists (ONCs) had higher NGS testing rates than pathologists (PATHs), with double the testing rates in 2L. NGS testing rates were higher in academic vs community settings, regardless of specialty. Conversely PATHs had higher SG testing rates than ONCs, particularly in community settings (Table). NGS testing rates were generally higher in 2L and SG testing higher in 1L. Conclusions: NGS is the optimal molecular testing modality for mNSCLC patients, however, there is a disparity of testing rates across physician specialties and treatment settings in decreasing order: academic ONCs > community ONCs > academic PATHs > community PATHs, who favor SG testing. This could be influenced by turnaround time needs, reimbursement challenges, and/or technology diffusion rate. As most mNSCLC patients are treated in the community setting, efforts are needed to tackle disparities in appropriate testing. [Table: see text]