Impact of IKZF1 deletions on IKZF1 expression and outcome in Philadelphia chromosome negative childhood BCP-ALL. Reply to “Incidence and biological significance of IKZF1/Ikaros gene deletions in pediatric Philadelphia chromosome negative and Philadelphia chromosome positive B-cell precursor acute lymphoblastic leukemia” - Chiara Palmi; Tobia Lana; Daniela Silvestri; Angela Savino; Geertruy Te Kronnie; Valentino Conter; Giuseppe Basso; Andrea Biondi; Maria Grazia Valsecchi; Giovanni Cazzaniga (Haematologica, 2013)