From the Journals

Ibrutinib plus venetoclax is active in mantle cell lymphoma

 

Key clinical point: Dual targeting of BTK and BCL2 with ibrutinib and venetoclax may improve complete response rate versus ibrutinib alone in patients with mantle cell lymphoma.

Major finding: Complete response rate at week 16 as assessed by CT was 42%, compared with 9% with ibrutinib monotherapy in a previous study (P less than .001).

Study details: A single-group phase 2 study of daily oral ibrutinib and venetoclax in 24 patients with mantle cell lymphoma (23 relapsed or refractory, 1 previously untreated), as compared with historical controls.

Disclosures: Janssen and AbbVie partially funded the study. Dr. Tam reported financial ties to Janssen, Abbvie, and Pharmacyclics. Other study authors reported financial ties to various pharmaceutical companies.

Source: Tam C et al. N Engl J Med. 2018;378:1211-23.


 

FROM THE NEW ENGLAND JOURNAL OF MEDICINE

In mantle cell lymphoma (MCL), ibrutinib plus venetoclax significantly improved the complete response rate, compared with what has been previously reported for ibrutinib alone, according to results of a phase 2 study.

Clinical outcomes with the combination seem superior to previously reported results for either treatment alone, said lead investigator Constantine S. Tam, MBBS, MD, of the Peter MacCallum Cancer Centre, Melbourne, and his coinvestigators.

“The results of our study, which used a historical cohort as a control, are consistent with the notion that the combination of ibrutinib and venetoclax is highly effective in mantle-cell lymphoma,” the investigators wrote in the New England Journal of Medicine.

The BTK inhibitor ibrutinib and the BCL2 inhibitor venetoclax are two of the most active agents for this B-cell cancer, investigators reported. The rationale for combining the agents is “compelling” because they affect different critical pathways in the malignant B cell.

Both agents have demonstrated complete response rates of 21% in previous studies of relapsed or refractory MCL, and preclinical studies suggest the combination of ibrutinib and venetoclax would be synergistic.

In the present single-group, phase 2 study, 24 patients with MCL (23 relapsed or refractory, 1 previously untreated) started ibrutinib 560 mg daily; at 4 weeks, venetoclax was started at a low dose and increased to 400 mg daily.

The study primary end point – complete response rate at week 16 assessed by CT – was 42%, compared with 9% for ibrutinib monotherapy in the phase 2 PCYC-1104-CA study (P less than .001).

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