CDKN2A and astrocytoma (excluding glioblastoma): Huillard et al. reported that the presence of BRAF V600E alone was insufficient for gliomagenesis and a concomitant homozygous deletion of CDKN2A (which encodes P14ARF and P16INK4A) was required for the development of astrocytomas from neural progenitor cells (Figure 1) (41).