Abstract
This retrospective study evaluated the benefit of alemtuzumab monotherapy in unselected patients with advanced B-cell chronic lymphocytic leukemia (CLL) and prolymphocytic leukemia (B-PLL) to definitely describe the impact of this antibody in clinical routine use. Data were collected from 208 consecutive, mainly pretreated, patients with CLL (n = 202), and B-PLL (n = 6) who had received alemtuzumab. Response, progression-free survival (PFS), and overall survival (OS) in various settings were assessed, and toxicities were documented. In these routine patients, a comparably low cumulative dose of alemtuzumab (median, 403 mg) was applied. In CLL, overall response rate was 32 %, and various pre-therapeutic parameters were predictive for inferior response, among them, the prior administration of ≥3 therapy lines (P < 0.001), refractoriness to fludarabine (P = 0.002), and bulky lymphadenopathy (P = 0.003). PFS and OS after start of alemtuzumab were 6.2 and 21.0 months, respectively. Bulky lymphadenopathy was the prominent risk factor for both inferior PFS (P < 0.001) and OS (P = 0.002). In B-PLL, four patients experienced a fatal outcome, whereas two patients had some benefit with alemtuzumab. The main adverse effects were CMV reactivation (20 %) and a broad spectrum of infections, which together were the main reasons for treatment interruption and/or premature termination. In conclusion, alemtuzumab administered even at low dose levels was effective but overall considerably toxic in routine CLL patients. We emphasize that alemtuzumab remains an important therapeutic option in subsets of CLL patients.
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Acknowledgments
Further contributors to this work included the following (Austrian centers unless indicated): W. Willenbacher, E Gunsilius (Innsbruck); G Webersinke (Linz); Martin Erdel (Linz); D Demirtas, M Shehata, U Jäger, N Zojer, G Tatzreiter, C Ganster (Vienna); B Walla (Dornbirn); S Hojas (Fürstenfeld); G Lobmaier (Ried); W Kanatschnig (Klagenfurt); J Thaler (Wels); F Bauer, M Speicher (Graz); S Cortelazzo, C Toldo, M Svaldi (Bozen/Italy); M Mitterer (Meran/Italy); and M Notdurfter (Bruneck/Italy). The authors wish to thank Mr. Jeffrey McCabe for editorial support. Bayer Schering Pharma Vienna GmbH provided funding (travel costs, 2007).
Note added
In August 2012, Genzyme surrendered the approved license of alemtuzumab, pending regulatory approval to reintroduce it as a treatment for multiple sclerosis. The authors of this article, convinced that alemtuzumab has an important role in the therapy of subsets of CLL patients [39, 40], regret this step and raise ethical concerns on this decision.
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The authors declare that they have no conflict of interest.
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Due to the retrospective nature of this study, informed consent was not needed.
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Fiegl, M., Stauder, R., Steurer, M. et al. Alemtuzumab in chronic lymphocytic leukemia: final results of a large observational multicenter study in mostly pretreated patients. Ann Hematol 93, 267–277 (2014). https://doi.org/10.1007/s00277-013-1966-z
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DOI: https://doi.org/10.1007/s00277-013-1966-z