Hodgkin's disease (HD) and non-Hodgkin's lymphoma (NHL) represent approximately 3-5% of all reported malignancies. Whilst the incidence of HD shows a general downwards trend, the overall incidence of NHL is gradually increasing by an estimated 3% per annum. A typical UK health authority (population 500 000) should expect to see between 60 and 70 new cases of NHL and 8-10 new cases of HD each year. Although patients with relapsed disease have historically had a very poor prognosis, new treatment strategies can now cure approximately 40 -50% of suitable patients.The use of high dose chemotherapy (HDC) initially supported by autologous bone marrow transplantation (ABMT) and, more recently, peripheral blood stem cells (PBSC), has rapidly become a routine treatment for relapsed lymphoma patients. In studies of relapsed HD patients, long-term survival rates of 50-65% have been reported using various HDC regimens (Reece et al, 1991;Bierman et al, 1993;Chopra et al, 1993;Goldstone et al, 1993 (Philip et al, 1991(Philip et al, , 1995Salzman et al, 1997). In a recent review (Beard et al, 1998) we considered the role and cost-effectiveness of HDC in the treatment of lymphoma for the Trent Institute Working Group on Acute Purchasing (TIWGAP), a regional body established to consider evidence of clinical and cost-effectiveness for new drugs and interventions. We present our pharmacoeconomic findings, and draw on the key messages of cost-effectiveness.
We focused specifically on patients with relapsed HD and relapsed high/intermediate grade NHL, as these are the areas where clinical evidence of efficacy is most convincing.A systematic literature search of Medline, Embase and BIDS Science Citation Index identifying all trials of HDC in lymphoma was carried out, to include all trials up until end January 1998. Results were cross-referenced against the references used within the ongoing HTA Systematic Review (now published -Johnson et al, 1998). Although randomized control trials (RCTs) were targeted as a 'gold standard', there is very little RCT evidence available in this area and evidence from large peer-reviewed case series was also considered. As curative therapy was the basis of HDC treatment the primary outcome measure of this analysis was cost per life year gained (LYG). In estimating the survival benefits of HDC against those of standard salvage chemotherapy, we adopted a methodology based on area under the curve (AUC) estimation, where the AUC was taken directly from the published Kaplan-Meier graphs. This approach allows the experience of the whole trial arm to be acknowledged rather than using a single point estimate, such as the median survival statistic.As trial data suggest a longer term survival for HDC we included a consideration of potential longer term benefits, i.e. those lying beyond the trial period, based on an extrapolation of published survival data. We adopted a conservative approach in terms of interpretation of clinical benefits and inclusion of treatment costs.Guidelines for costing chemotherapy...