Antigen Escape in Relapsed/Refractory Large B-Cell Lymphoma: A Case Series of CD20 Expression Loss After CD20-Directed Therapy (SOHO 2026) - Sep 1, 2026 - Abstract #ABCL-678; Location: LEVEL 3, HALL B3; "Context: CD20-directed therapy remains foundational in the management of LBCL, yet relapsed disease may emerge with loss of CD20 expression, limiting the utility of rituximab- or obinutuzumab-based regimens or bispecific antibodies...All patients had received prior CD20-directed therapy, most commonly rituximab-containing regimens, including R-CHOP, REPOCH, R-GemOx, R-ICE, rituximab-lenalidomide, or bendamustine-rituximab. Several also received contemporary salvage approaches, including polatuzumab-based therapy, epcoritamab, tafasitamab-lenalidomide, radiation, lymphodepleting chemotherapy, and CAR-T therapy with axicabtagene ciloleucel or tisagenlecleucel... CD20-negative conversion is a clinically consequential pattern of relapse in heavily pretreated LBCL. This series highlights the importance of repeat biopsy at progression to reassess targetable antigen expression and avoid ineffective recycling of CD20-directed therapy. Antigen reassessment should inform..."
Clinical • IO biomarker • B Cell Lymphoma • Diffuse Large B Cell Lymphoma • Follicular Lymphoma • Hematological Malignancies • High-grade B-cell lymphoma • Indolent Lymphoma • Large B Cell Lymphoma • Lymphoma • Non-Hodgkin's Lymphoma • Oncology • CD19 • CD20 • CD22
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Kareem Latif MD 1; Jasmine Cha BS 2; Yagoda Jedrzejczak BS 3; Mojtaba Akhtari MD 1
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