Inclusion Criteria:

- Patient with a history of classical HL relapsed/refractory which received IGEV
regimen as induction therapy before high dose chemotherapy with AHSCT

- Age >18 years

- Patients with relapsed/refractory disease after standard treatments (chemotherapy +/-
radiotherapy) before IGEV induction regimen. (Relapsed = disease relapse after CR.

Refractory = non CR with last chemotherapy line, or progression during last treatment, or
disease progression within three months from previous treatment completion).

- Availability of clinical data, laboratory values and CT scan results of patients
enrolled, performed from diagnosis to the last follow-up

- Patient scheduled to receive three or four IGEV cycles as pretransplantation
induction regimen.

- First IGEV course started before December 31st 2007

- Assessment of tumor response by Cheson 1999 criteria 11

Exclusion Criteria:

- NONE