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Patients with relapsed/refractory (R/R) follicular lymphoma (FL) represent a difficult-to-treat population, with limited treatment options. About 20% of FL patients have mutations in EZH2,1 an epigenetic regulator of gene expression and cell fate decision that is required for normal B cell biology.2 EZH2 biology is relevant in both mutant (MT) and wild-type (WT) EZH2 FL. Tazemetostat is a first-in-class, selective, oral EZH2 inhibitor, that has demonstrated antitumor activity in MT or WT EZH2 R/R FL patients, in a multicenter, open-label (NCT01897571) phase I/II study.3
The Lymphoma Hub has previously published an interim update from the phase II part of the study. At the 61st American Society of Hematology (ASH) Annual Meeting & Exposition, Franck Morschhauser, CHRU Lille, Lille, FR, reported efficacy and safety data from the FL cohorts of the phase II study.4
CI, confidence interval; CR, complete response; DOR, duration of response; MT, mutant; NE, non-evaluable; NR, not reached; ORR, objective response rate; PR, partial response; PFS, progression-free survival; WT, wild-type.
aMedian DOR is still maturing for the MT EZH2 cohort
Parameter
MT EZH2 (n= 45)
WT EZH2 (n= 45)
Investigator
IRC
Investigator
IRC
ORR, n (%)
(95% CI)
CR, n (%)
PR, n (%)
Stable disease, n (%)
Progressive disease, n (%)
35 (78)
(62.9─88.8)
4 (9)
31 (69)
10 (22)
0
31 (69)
(53.4─81.8)
6 (13)
25 (56)
13 (29)
1 (2)
18 (33)
(21.1─47.5)
3 (6)
15 (28)
16 (30)
16 (30)
19 (35)
(22.7─49.4)
2 (4)
17 (31)
18 (33)
12 (22)
Median time to first response, months
(range)
3.8
(1.6─11)
3.7
(1.6─10.9)
3.5
(1.6─16.3)
3.7
(1.6─16.3)
Median DORa, months
(95% CI)
8.3
(5.5─13.8)
10.9
(7.2─NE)
14.7
(7.6─NR)
13
(5.6─NR)
Patients ongoing, n (%)
13 (29)
0
Median follow-up, months (range)
22 (2.8─43.5)
35.9 (0.3─48.8)
Median PFS, months
(95% CI)
13.8
(8.4─16.4)
13.8
(10.7─22)
5.6
(3.3─11.1)
11.1
(3.7─14.6)
References
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What is your preferred therapy class when planning treatment for a patient with R/R DLBCL after 2 or more lines of systemic therapy ?