Inclusion Criteria:

- a) Age over 18 b) Histological diagnosis of diffuse large B cell lymphoma c) Patients
who have received Gemcitabine-cisplatin, methylprednisolone (GEM-P) as per standard unit
guidelines with or without Rituximab for relapsed/refractory DLBCL.

d) Informed written consent

Exclusion Criteria:

- a) Medical or psychiatric conditions that compromise the patient's ability to give
informed consent b) HIV positive or AIDS related lymphoma