CHEK1 and diffuse large B-cell lymphoma: To this end, we combined the IC20 of inhibitors of eight DNA repair factors (PF‐47736 (Chk1i), NU‐7441 (DNA‐PKi), AZD‐1775 (Wee1i), AZD‐6738 (ATRi), MK‐8776 (Chk1/2i), MP‐470 (Rad51i), KU‐55933 (ATMi), PJ34 (PARP1/2i)) with doxorubicin, etoposide and 4‐OH‐Cyclophosphamide, using the U2932 cell line (ABC‐DLBCL) that is one of the most resistant to the different DDR inhibitors.