Looking at the baseline migration velocity, we could confirm in microchannels with a width of 8 μm and a height of 10 μm that the cHL cell lines L‐1236 and L‐428 move at a significantly lower velocity (0.76 and 0.90 μm/min, respectively) than ALK+ (1.52 and 1.45 μm/min) and ALK− ALCL cell lines (1.63 and 1.31 μm/min; one‐way ANOVA with Bonferroni ́s post‐test for multiple comparisons; Figure 2). The gene discussed is ALK; the disease is anaplastic large cell lymphoma.