Aakash Desai, Associate Director, Phase 1 and Precision Oncology Program at UAB O’Neal Comprehensive Cancer Center, shared on LinkedIn:
“A new study in the International Association for the Study of Lung Cancer Journal of Thoracic Oncology highlights a crucial diagnostic detail for non-small cell lung cancer (NSCLC).
Researchers found that using immunohistochemistry (IHC) to directly assess MTAP protein deficiency is more reliable than using CDKN2A gene loss as a surrogate marker. The study revealed that CDKN2A loss, often checked in sequencing panels, can overestimate actual MTAP loss in over 25% of cases.
Why it matters:
Since MTAP status is a potential biomarker for response to PRMT5 inhibitors and immune-checkpoint inhibitors, accurately identifying it is critical for patient stratification and treatment selection.”
Title: MTAP expression by immunohistochemistry: a novel biomarker in non-small cell cancer of the lung
Journal: JTO
Authors: Magdalena M Brune, Luca Roma, Obinna Chijioke, Ilaria Alborelli, Martin Zacharias, Lenard Bubendorf, Tatjana Vlainic, Nikolaus Deigendesch, Julian Pollinger, Petra Hirschmann, David König, Sebastian Ott, Spasenija Savic-Prince, Lukas Bubendorf
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