DNMT1 and non-small cell lung carcinoma: Flucytosine targets the DNMT1 gene in Group I. DNMT1 is mainly enriched to the GO:0033002 functional class, namely muscle-cell proliferation, and Jia et al. demonstrated that NSCLC-derived exosomes promote cell proliferation and inhibit cell apoptosis in both normal lung fibroblasts and NSCLC cells by delivering ASMA.