TLS in clinical trials

TLS, including fatal events, has occurred in patients with CLL with high tumor burden when treated with VENCLYXTO. TLS was reduced in the phase 1 VENCLYXTO monotherapy dose‑finding studies through implementation of a 5‑week dose‑titration schedule with a well‑defined prophylactic and monitoring protocol approved for use with VENCLYXTO monotherapy.

TLS in the CLL14 trial

  • Current TLS prophylaxis and monitoring protocol was implemented in the CLL14 trial1
  • Patients were assessed for risk of TLS and received prophylaxis accordingly prior to obinutuzumab administration2
  • TLS occurred in 1.4% (3/212) of patients treated with VEN+O2
  • All 3 TLS events resolved and did not lead to withdrawal from the study. Obinutuzumab administration was delayed in 2 cases in response to the TLS events

TLS in the MURANO trial2

  • After 77 patients were enrolled in the VEN+R or BR treatment arms of the MURANO study, the protocol was amended to incorporate the current TLS prophylaxis and monitoring measures (5‑week dose‑titration schedule)
  • In the MURANO study, the incidence of laboratory TLS was 3% (6/194) in patients treated with VEN+R; all events of TLS occurred during the dose‑titration phase 
    • All TLS events resolved within 2 days
    • All 6 patients completed the dose‑titration schedule and reached the recommended daily dose of 400 mg of VENCLYXTO
  • No clinical TLS was observed in patients who followed the current 5‑week dose‑titration schedule and prophylaxis and monitoring measures
  • Grade ≥3 laboratory abnormalities relevant to TLS were hyperkalemia (1%), hyperphosphatemia (1%), and hyperuricemia (1%) 

 

CLL=chronic lymphocytic leukemia; 1L=first line; 2L+=second line + later lines of therapy; O+Clb=obinutuzumab + chlorambucil; HR=hazard ratio; CI=confidence interval; PFS=progression‑free survival; BR=bendamustine + rituximab; VEN+R=VENCLYXTO + rituximab; TLS=tumor lysis syndrome; VEN+O=VENCLYXTO + obinutuzumab. 

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References: 1. Fischer K, Al-Sawaf O, Bahlo J, et al. Venetoclax and obinutuzumab in patients with CLL and coexisting conditions. N Engl J Med. 2019;380(23):2225-2236. 2. VENCLYXTO Summary of Product Characteristics. Ludwigshafen, Germany: AbbVie Deutschland GmbH & Co. KG. <Current SmPC.>

GR-VNCCLL-200048 -JAN2021