TCL-323 Outcome of Relapsed and Refractory Peripheral T-Cell Lymphoma (PTCL) With Intention for Curative Therapy Incorporating High-Dose Chemotherapy and Hematopoietic Stem Cell Transplant (HDC/SCT)

Salvage therapy with high-dose chemotherapy and hematopoietic stem cell transplant (HDC/SCT) is recommended for patients with relapsed/refractory (R/R) PTCL. We evaluated the outcomes of R/R PTCL from the time of first relapse/progression in patients intended for SCT (ITT).The BC Cancer Lymphoid Cancer Database was reviewed, and patients ≥18 years with R/R PTCLs, such as systemic anaplastic large cell lymphoma (ALCL), angioimmunoblastic T-cell lymphoma (AITL), and PTCL-not otherwise specified (PTCL-NOS), were included. Outcomes were assessed from the time of first relapse/progression and from the time of SCT.Of 114 included patients with ITT R/R PTCL, 60% had refractory disease and were more likely to have a high secondary IPI score, poor performance status, or advanced-stage disease. For second-line therapy, the majority received multi-agent chemotherapy (n = 83, 73%) with GDP, (gemcitabine, dexamethasone, and cisplatin) the most used regimen (n = 59, 52%), whereas 15 patients (13%) received novel agents (brentuximab vedotin [BV] = 12; romidepsin=2; pralatrexate=1). The overall response rate (ORR) to second-line therapy was 61% (24% complete response [CR]; 37% partial response [PR]). The ORR to GDP was 61% (17% CR; 44% PR), with higher responses observed in relapsed patients (81% vs. 41%, p=0.002). Seventy-three patients (63%) received HDC/SCT. Those who underwent allo-SCT were younger and more likely to have refractory disease (50% vs. 16%, p=0.001). Third-line therapy was required in 17/67 (25%), including novel agents in 9 cases. The median follow-up for living patients was 6.8 years. The 5-year progression-free survival (PFS) and overall survival (OS) from the time of first relapse/progression were 28% and 38%, respectively. The 5-year PFS from auto and allo-SCT were 34% and 52% (p = 0.3), and 5-year OS were 44% and 67% (p=0.5), respectively.Overall, outcomes for patients with ITT R/R PTCL remain suboptimal, with long-term survival in only one-third of patients; however, over half remained alive at 5 years if they were able to receive an SCT. A third line of therapy may serve as a successful bridge to SCT, and novel agents should be considered. Despite a higher proportion of refractory patients, results are encouraging with allo-SCT.