BRD9 and small cell lung carcinoma: Among these subtypes, POU2F3-driven SCLC (SCLC-P) exhibits SWI/SNF dependency, especially towards SWI/SNF ATPases and ncBAF complex subunits, including BRG1, SMARCD1, and BRD9 (Huang et al., 2018; Duplaquet et al., 2024; He et al., 2024).