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News & Trends - Pharmaceuticals

BeiGene’s BTK inhibitor superior in first head-to-head blood cancer trial

Health Industry Hub | December 15, 2022 |

Pharma News: BeiGene’s bruton tyrosine kinase (BTK) inhibitor showed superior efficacy with fewer side effects in the first head-to-head comparison between the two drugs among people with chronic lymphocytic leukaemia (CLL) and small lymphocytic lymphoma (SLL), according to data presented at the 64th American Society of Haematology (ASH) Annual Meeting and Exposition.

At two years, 79% of patients taking BeiGene’s Brukinsa (zanubrutinib) and 67% of those taking Janssen’s Imbruvica (ibrutinib) were still alive without evidence of their cancer returning. The study was conducted in patients whose CLL or SLL had not responded to an initial course of therapy or came back after an initial response. The results revealed a particularly dramatic difference in people whose CLL has del(17p) and/or TP53 mutations, mutations present in about one-quarter of relapsed CLL and SLL tumors that are associated with a poorer prognosis.

“Zanubrutinib not only improves the response rate, it also improves progression-free survival compared to ibrutinib, including in our highest risk patients,” said Dr Jennifer Brown, Dana-Farber Cancer Institute and Harvard University.

“Progression-free survival is pretty much our gold standard for efficacy, so our data suggest that zanubrutinib should really become the standard of care in this setting.”

“The BTK inhibitor drug class has been transformative for CLL therapy, but the first-in-class drug ibrutinib has been somewhat hard to tolerate for many patients, with cardiac side effects being one of the biggest problems,” said Dr Brown.

“We found that zanubrutinib caused fewer adverse events, and in particular much less cardiac toxicity.”

The phase III trial enrolled 652 patients with relapsed or refractory CLL or SLL in 15 countries. Half of the participants received zanubrutinib and half received ibrutinib; patients continued taking their assigned treatment until their cancer grew worse or they experienced unacceptable side effects.

At a median follow-up of about 2.5 years, patients taking zanubrutinib had a significantly higher overall response rate and superior progression-free survival, a finding that held across all major predefined subgroups. Participants taking zanubrutinib also experienced fewer adverse events that led to drug discontinuation, dose reduction, or dose interruption. Fatal cardiac events occurred in six of the patients taking ibrutinib and none of those taking zanubrutinib.

The researchers will continue to track outcomes and analyse trends among patient subgroups, including those with del(17p), TP53, complex karyotype and other mutations. Additional studies are planned to assess the use of Brukinsa in combination with other therapies.

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