NTRK1 and neuroblastoma: However, one of our previous study revealed that AL356599.1 (updated as FBXO30-DT, and previously known as LOC1005075557) and AC022075.1(updated as KLRK1-AS1, and previously known as LOC101928100) might be implicated in the process of spontaneous regression of NB, as both of them are differentially expressed between stage 4 and stage 4S NB samples and are correlated with the expression of NTRK1 (a well-known factor involved in spontaneous regression of NB) (32–34).