In a fourth clinical case, an EGFR L858R NSCLC harbored a co-occurring RBM10 c2167-1 G>T splice site mutation as detected by clinical-grade NGS. This patient was enrolled in the same neo-adjuvant osimertinib clinical trial and also showed minimal EGFR TKI response, with 68.3% tumor cell viability in the osimertinib-treated...