Li et al. have recently shown that BTK is expressed in neuroblastoma cell lines, but contrary to this report [20], we did not observe the expression of BTK in MYCN amplified (SKNBE2, IMR32) and non-MYCN amplified (SH-SY-5Y, SKNSH) human neuroblastoma cell lines (Figure 2F). The gene discussed is MYCN; the disease is neuroblastoma.