Lung Cancer Research Reagents: EGFR, ALK, PD-L1 & Emerging Targets

Lung cancer is the leading cause of cancer death worldwide, with non-small cell lung cancer (NSCLC) accounting for approximately 85% of cases. The treatment landscape has been transformed by targeted therapies (EGFR TKIs, ALK inhibitors) and immune checkpoint inhibitors (anti-PD-1/PD-L1), making molecular profiling of lung tumors essential for treatment selection.

Key Targets and Biomarkers

EGFR mutations (exon 19 deletions, L858R, T790M resistance) are found in 10–15% of NSCLC in Western populations and up to 50% in Asian populations. Anti-EGFR antibodies for IHC, WB (total and phospho), and flow cytometry are essential for expression and activation studies.

ALK rearrangements (EML4-ALK fusion) occur in ~5% of NSCLC. Anti-ALK antibodies (clone D5F3 or equivalent) are used in IHC as a companion diagnostic surrogate. ROS1 fusions (~1–2%) and MET amplification/exon 14 skipping are additional actionable targets.

PD-L1 IHC scoring (Tumor Proportion Score, TPS) is used to select NSCLC patients for first-line pembrolizumab monotherapy (TPS ≥ 50%). Research-use anti-PD-L1 antibodies enable expression studies without the constraints of diagnostic-grade clone licensing.

KRAS G12C, previously considered undruggable, is now targetable with covalent inhibitors (sotorasib, adagrasib). Anti-KRAS antibodies and recombinant KRAS proteins (wild-type and G12C mutant) are available for mutation detection and functional studies.

For SCLC: DLL3, ASCL1, and neuroendocrine markers (synaptophysin, chromogranin A, CD56) are key research targets, with DLL3 ADCs in clinical development.

References

1. Thai AA, Solomon BJ, Sequist LV, Gainor JF, Heist RS. Lung cancer. Lancet. 2021;398(10299):535-554. doi: 10.1016/S0140-6736(21)00312-3

1. Pardoll DM. The blockade of immune checkpoints in cancer immunotherapy. Nat Rev Cancer. 2012;12(4):252-264. doi: 10.1038/nrc3239

1. Hanahan D. Hallmarks of cancer: new dimensions. Cancer Discov. 2022;12(1):31-46. doi: 10.1158/2159-8290.CD-21-1059

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