The ECHELON-2 trialr was a double-blind phase 3 study from 17 countries of untreated peripheral T-cell lymphoma (PTCL) in patients whose lymphoma had at least 10% of cells expressing CD30. Histological subtypes included anaplastic large cell lymphoma (ALCL) ALK-negative, ALCL ALK-positive with an International Prognostic Index (IPI) score of 2 or higher, PTCL-not otherwise specified, angioimmunoblastic lymphoma, adult T-cell leukaemia/lymphoma, enteropathy associated lymphoma, and hepatosplenic T-cell lymphoma. There was a 1:1 randomisation to brentuximab vedotin, cyclophosphamide, doxorubicin and prednisolone (BV-CHP) or cyclophosphamide, doxorubicin, vincristine and prednisolone (CHOP) for 6-8 cycles. A consolidative stem cell transplant or radiotherapy could be performed at the end of the chemotherapy at the investigator’s discretion.
452 patients were randomised. 72% had ALCL, median age was 58. The primary end point was progression-free survival (PFS). The median PFS was 48 months for BV-CHP and 21 months for CHOP (figure 1). Compared with CHOP, BV-CHP significantly reduced the risk of death by 34% (figure 2). Rates of consolidative therapy were higher in the BV-CHP arm; 27% vs 19%.
The study was not powered to compare the efficacy between the histological subtypes.
Efficacy
After a median follow up of 42.1 months, the median overall survival (OS) was not reached for either group. The 75th percentile OS was not reached for the BV-CHP group, but was 17.5 months for the CHOP group.
Figure 1. Progression-free survivalr

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Figure 2. Overall survival for the intention-to-treat populationr

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Toxicity
Adverse events were similar in each arm.
Table 1. Adverse eventsr

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