Effective treatment of HER2-driven NSCLC requires more than just identifying mutations. HER2 is a multiplexed biomarker where both genetic mutations (TKD and non-TKD) and protein overexpression (via IHC) are independently actionable. Comprehensive testing is crucial to ensure patients are eligible for the full range of available targeted therapies, including TKIs and ADCs.

Clinical trials for MET-targeted therapies in NSCLC use varying definitions for MET amplification, including different Gene Copy Number (GCN) or MET-CEP7 ratio cutoffs. This inconsistency makes it challenging to compare drug efficacy and apply trial data directly to clinical practice.

Comprehensive molecular testing (PD-L1, EGFR, ALK) is no longer reserved for advanced disease. It is now critical for all patients with stage 1B or higher resectable NSCLC *before* starting any treatment to guide neoadjuvant and adjuvant therapy decisions.

In community SCLC care, molecular strategies are not monolithic. Genomic alteration testing (NGS) is ready for immediate use and can identify targets today. In contrast, neuroendocrine subtyping is still investigational and not yet clinically actionable, pending results from research studies.

Instead of basing adjuvant radiation decisions on a patient's initial, pre-treatment tumor stage, clinicians should use the post-neoadjuvant pathological stage (ypTNM). Patients with a major pathologic response (e.g., downstaging from T3 to T1) may be able to safely avoid additional adjuvant radiation therapy.

An AJCC expert panel found T-stage (tumor depth) is a more dominant prognostic factor than the traditional N-stage (lymph node involvement). This fundamental shift, likely for the 9th edition, will reclassify many patients, upstaging some stage II and downstaging some stage III patients to create a more accurate, hierarchical system.

Contrary to its traditional monolithic treatment approach, SCLC is now understood to have distinct transcriptomic subsets (e.g., ASCL1, NeuroD1). The future of SCLC therapy will likely involve biomarker testing to match patients with the most effective treatments for their specific subtype, mirroring the personalized approach in non-small cell lung cancer.

Dr. Ramalingam describes a nuanced clinical approach based on early NEO ADORA data: using neoadjuvant chemo-osimertinib for N2 positive (Stage 3A) patients, but favoring upfront surgery followed by adjuvant therapy for Stage 2. This shows how specialists apply preliminary findings before they become universal standards.

The Rampart study's use of the Leibovic score for risk stratification is a key strength. Unlike traditional TNM staging, this score more heavily weights tumor grade, which clinicians find to be a more granular and clinically relevant predictor of recurrence risk than just tumor size.