Antitumor activity of brentuximab vedotin in CD30 positive refractory germ cell tumors

• Published in: Journal of clinical oncology Vol. 31; no. 6_suppl; p. 327
• Main Authors: Albany, Costantine, Feldman, Darren Richard, Garbo, Lawrence E., Einhorn, Lawrence H.
• Format: Journal Article
• Language: English
• Published: 20.02.2013
• ISSN: 0732-183X; 1527-7755
• DOI: 10.1200/jco.2013.31.6_suppl.327

Abstract only 327 Background: Brentuximab Vedotin (BV) is a novel antibody drug conjugate that combines the agent mono-methyl auristatin E (MMAE) to a CD-30 specific monoclonal antibody by a protease-cleavable linker. It is approved by the FDA for treatment of relapsed Hodgkin lymphoma (HL) and systemic anaplastic large cell lymphoma (ALCL). In addition to HL and ALCL, CD-30 expression has been reported on malignant tumors of non-lymphoid origin including testicular embryonal carcinoma (EC). Here we report our initial experience in three heavily pre-treated patients with CD30-positive EC who were treated as part of an ongoing phase 2 open-label multicenter study designed to evaluate the antitumor activity of BV in patients with CD30-positive non-lymphomatous malignancies. Methods: Three men with relapsed or refractory, histologically confirmed CD-30 positive testicular cancer received BV until progression or toxicity. CD-30 expression was assessed by immunohistochemistry. All 3 patients were dosed at 1.8 mg/kg IV every 21 days and followed for response at cycles 2, 4. Results: Three patients were enrolled at 2 sites in the US. Median age was 26 years (range 24-33). All 3 patients progressed after high dose chemotherapy with peripheral blood stem cell transplant. Two patients received BV as 4 th line and 1 patient as 3 rd line therapy. Tumor sites included lungs, liver, retroperitoneal, mediastinal and supraclavicular lymph nodes. The first patient baseline hCG was 5571. After 2 cycles of therapy, hCG nadir was 45 with a radiologic partial response (PR) by RESICT that lasted 2 months. He then had serologic and radiographic progression in the liver while on therapy. Patient 2 was serologic marker negative and had a radiographic PR by RECIST in lung and mediastinum after cycle 2 and continues on therapy. Patient 3 had a baseline hCG of 10400, with nadir at 110 after 2 doses and continues to have serologic response. By RECIST he currently has stable disease. The treatment was well tolerated in all 3 patients with no grade 3-4 toxicities. Conclusions: All 3 patients with heavily pretreated CD-30 positive EC had clinical benefit after treatment with brentuximab vedotin. The treatment was well tolerated. The enrollment is ongoing in this Phase 2 study. Clinical trial information: NCT01461538.