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‘New Gold Standard’ for Previously Untreated CLL

December 11, 2023
in Health
‘New Gold Standard’ for Previously Untreated CLL
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SAN DIEGO — A time-limited, targeted combination significantly improved survival compared with chemoimmunotherapy in fit chronic lymphocytic leukemia (CLL) patients who met criteria for starting treatment, findings from the randomized FLAIR trial indicated.

At 3 years, progression-free survival (PFS) rates reached 97% for patients randomized to venetoclax (Venclexta) plus ibrutinib (Imbruvica), as compared with 77% for those assigned to the standard chemoimmunotherapy regimen of fludarabine, cyclophosphamide, and rituximab (FCR), reported Peter Hillmen, MBChB, PhD, of St. James’s University Hospital in Leeds, England.

The venetoclax-ibrutinib regimen also significantly improved overall survival (OS) — with deaths occurring in 2% of patients treated with the targeted combination at this time point versus 7% of those assigned to chemoimmunotherapy — improved responses, and was associated with half as many secondary cancers, according to findings detailed during a press briefing here at the American Society of Hematology annual meeting.

In a statement, Hillmen said the time-limited approach represents “a new gold standard for previously untreated CLL.”

This research “unequivocally shows the superiority of targeted therapy over traditional cytotoxic chemotherapy,” said press briefing moderator Mikkael Sekeres, MD, of the University of Miami Miller School of Medicine. “As someone who specializes in leukemia/myelodysplastic syndromes, I have the feeling I won’t be seeing these CLL patients in my clinic years after being treated for their CLL much longer.”

Sekeres pointed out that FCR has largely fallen out of favor in the U.S. with the approval of targeted alternatives.

In the trial, the venetoclax-ibrutinib regimen was given for 2 to 6 years depending on patients’ speed of response, as determined by measurable residual disease (MRD). Ibrutinib is conventionally given as monotherapy until disease progression in CLL, while venetoclax is given in combination with a monoclonal antibody for an arbitrary fixed duration of time, Hillmen explained.

“The big issue for targeted treatment in CLL is the duration of therapy, which can be very long in frontline,” he said, noting the risk for drug resistance and toxicities.

As some patients will relapse if only treated to MRD negativity (less than one CLL cell per 10,000 cells on flow cytometry), participants on venetoclax-ibrutinib were treated for twice as long as it took to attain MRD negativity, in the theory that the rate of MRD decline would continue at the same rate and that the additional therapy would have a “major impact” on outcomes, he said.

For example, if a patient attained MRD negativity at 1 year, they would receive 2 years of therapy. By 3 years in the study, 58% of the patients on venetoclax-ibrutinib had ceased treatment in accordance with these MRD stopping rules.

“This is the first trial to show that an MRD-guided approach, with treatment beyond negativity, has a significant advantage over chemoimmunotherapy, both in terms of PFS and overall survival,” said Hillmen. He added that roughly 90% of patients achieved MRD-negative remission with venetoclax-ibrutinib, and that the PFS benefit was observed in all subgroups apart from IGHV-mutated patients.

The phase III FLAIR trial enrolled fit patients with previously untreated CLL at 96 centers in the United Kingdom from July 2017 to March 2021. Investigators from the U.K. National Cancer Research Institute group randomly assigned 523 participants to either six cycles of FCR chemoimmunotherapy or to daily venetoclax (400 mg) plus ibrutinib (420 mg), with treatment duration based on MRD response. Investigators routinely assessed MRD status via peripheral blood and bone marrow.

Patients needed to have untreated CLL that required treatment per International Workshop on Chronic Lymphocytic Leukemia criteria. About 80% of patients screened for the trial presented with an isolated lymphocytosis and no symptoms, and therefore did not require treatment and were not enrolled, said Hillmen.

“This research does not alter that dynamic, we should not be treating patients earlier because probably half of those patients will never go on to need treatment,” he said. Hillmen noted that patients in that phase of their disease have an inferior quality of life: “‘wait and watch’ in CLL is a really difficult place for patients, and it’s been replaced by ‘watch and worry.'”

“Now that we have therapies that really do probably stop people dying from the disease, and even potentially cure them — that should reassure patients,” he added.

To enroll in the trial, patients also had to be sufficiently fit for FCR, and age 75 or younger. They were excluded if they had a history of Richter’s transformation,>20% TP53 deletion on fluorescence in situ hybridization, were taking warfarin (or an equivalent), and if they had symptomatic cardiac failure or angina.

This resulted in a study population that was 71% male, with a median age of 62 years. One-third had good-risk IGHV-mutated disease while about half had IGHV-unmutated disease; other genetic abnormalities included ATM deletions in 18%, a poor prognosticator for chemotherapy response; trisomy 12 abnormalities in 16%; and 13q deletions in 36%.

The study’s primary endpoint was PFS; secondary endpoints included OS, response, and safety.

Hazard ratios (HRs) for PFS and OS at 3 years showed an 87% reduction in the risk for disease progression or death (HR 0.13, 95% CI 0.07-0.24, P
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