TP53 and neuroblastoma: Among neuroblastoma xenograft models, ALK surface expression was highest in NB-1 (ALK-amplified, MYCN-amplified; geometric mean 668.7x IgG control), followed by COG-N-424x (ALK WT, MYCN-amplified; geometric mean 27.7x IgG control), NB-SD (ALK F1174L mutated, MYCN-amplified, TP53 mutated; geometric mean 15.0x IgG control), and SK-N-AS (ALK WT, MYCN non-amplified; geometric mean 3.5x IgG control).