LONGITUDINAL ANALYSES OF DIAGNOSTIC‐RELAPSE BIOPSIES OF DIFFUSE LARGE B CELL LYMPHOMA SUGGEST THAT RELAPSE IS MEDIATED BY DISTINCT MECHANISMS IN ABC AND GCB LYMPHOMA. (12th June 2019) - Korfi, K.; Araf, S.; Bewicke‐Copley, F.; Kumar, E.; Cummin, T.; Ashton‐Key, M.; Barrans, S.; Van Hoppe, S.; Burton, C.; Elshiekh, M.; Rule, S.; Crosbie, N.; et al.