RESPONSE TO A+CHP BY CD30 EXPRESSION IN THE ECHELON‐2 TRIAL. (12th June 2019) - Illidge, T.; Horwitz, S.; Iyer, S.; Bartlett, N.; Kim, W.; Tilly, H.; Belada, D.; Feldman, T.; Illés, Á.; Jacobsen, E.; Hüttmann, A.; Zinzani, P.; et al.