SummaryThere are a number of options for salvage treatment in children and adolescents with relapsed and refractory classical Hodgkin Lymphoma. These include salvage with standard dose chemotherapy, high dose chemotherapy with autologous stem cell transplant, allogeneic stem cell transplant or other novel approach. Radiotherapy has an important role in the salvage of some patients as part of a combined modality approach. This review outlines these salvage approaches and discusses whether the evidence from paediatric studies justifies a risk-adapted approach to salvage for individual patients or whether all patients should receive consolidation with high dose chemotherapy and autologous stem cell transplantation, which is often described as standard salvage management in adults. The important prognostic factors and how these may be used to allocate patients to standard versus high dose chemotherapy regimens are discussed. The role of allogeneic transplantation, novel agents and late effects will also be discussed.Keywords: paediatric, Hodgkin lymphoma, relapsed, refractory, salvage.The cure rates of first-line treatment for classical Hodgkin lymphoma (HL) in children are very high with the use of modern effective chemotherapy, often used in combination with involved field radiotherapy (IFRT). The most effective regimens achieve cure rates in excess of 90% for early stage and 80% for advanced stage disease, with equivalent outcomes for adolescents and children (Schellong et al, 1986(Schellong et al, , 1999Vecchi et al, 1993Vecchi et al, , 1997Hunger et al, 1994;Schellong, 1996;Donaldson & Link, 1997;Hutchinson et al, 1998;Dörffel et al, 2003;El-Badawy et al, 2008). Single modality radiotherapy (RT) is rarely used now as primary treatment due to unacceptable failure rates even in low stage patients (Shankar et al, 1997). Paediatric paradigms for primary treatment have evolved to reduce late effects whilst maintaining excellent cure rates (Hodgson et al, 2007), achieved by developing chemotherapeutic regimens that minimize late toxicity and, when given, RT is low dose (20-25 Gy) and involved field. Primary chemotherapy is allocated using a risk-adapted approach utilizing prognostic factors associated with primary treatment failure (Smith et al, 2003), and response to chemotherapy is under study to guide either the final number of chemotherapy cycles (Schwartz et al, 2009), or to limit or remove RT in patients who achieve complete remission with chemotherapy alone (Dörffel et al, 2003).
Salvage therapy -general considerationsApproximately 10% of patients with early stage, and up to 25% with advanced stage disease, relapse after first line therapy (Donaldson et al, 2007;Schwartz et al, 2009). Cure may still be achieved in patients with recurrent disease and all should receive second-line standard dose salvage chemotherapy (SDCT). Salvage single modality RT is rarely used. There are no randomized trials in children defining the 'best' salvage chemotherapy regimen or comparing SDCT with high dose chemotherapy (HDCT) and...