Discriminant Analysis Involving Serum Cytokine Levels and Prediction of the Response to Therapy of Patients with Hodgkin Lymphoma

Current standard diagnostic methods do not identify patients with Hodgkin lymphoma (HL), who are at high risk of failure after the first-line treatment. In HL patients, serum cytokine levels are frequently elevated and correlate with clinical and pathological features of the disease as well as with disease-free survival and overall survival. The aim of this study was to investigate if pretreatment serum cytokine and cytokine receptor concentrations evaluated by discriminant analysis could be predictive of response to standard first-line treatment in HL. The study involved 48 previously untreated patients with histologically confirmed classical HL and no EBV infection. Treatment included chemotherapy and involved field radiotherapy or radiotherapy alone. At the end of treatment, 71 % of patients reached complete response (CR), and 29 %, in partial response. To identify parameters predictive of nonachievement of CR after the first-line treatment, the discriminant analysis was used. The following variables were included in the analysis: clinical stage, sex, age, histologic subtype, bulky mediastinal mass, systemic symptoms and the number of involved nodal areas, lactate dehydrogenase (LDH) activity, and serum levels of 12 cytokines/cytokine receptors. The resulting classifying function assigned a discriminant power to the following variables: the levels of vascular endothelial growth factor, interleukin-8, macrophage colony stimulating factor, basic fibroblast growth factor, soluble tumor necrosis factor receptor I, and LDH activity. The accuracy of predicting CR and non-CR was 94 and 43 %, respectively.