BRAF and astrocytoma (excluding glioblastoma): As part of the Pediatric Preclinical Testing Program (PPTP), 2 astrocytoma cell lines were generated, BT-35 cells which had 2 to 5 copies of wild-type (WT) BRAF and BT-40 cells which had 5 copies of activated BRAF V600E [ (50, 51), Table 2)].