Drug produces high response rates in AITL
Photo by Larry Young
SAN FRANCISCO—Treatment with 5-azacitidine (5-AZA) can produce a high response rate in patients with relapsed/refractory angioimmunoblastic T-cell lymphoma (AITL), according to a small study.
The overall response rate (ORR) among AITL patients was 75%, and the complete response (CR) rate was 42%.
However, this study also included patients with other types of peripheral T-cell lymphoma (PTCL), and most of these patients did not respond to 5-AZA.
Richard Delarue, MD, of Necker University Hospital in Paris, France, presented these results at the 9th Annual T-cell Lymphoma Forum.
Results were also presented at the 2016 ASH Annual Meeting (abstract 4164). Dr Delarue reported receiving honoraria from Celgene.
Patients
The study included 19 patients with relapsed/refractory PTCL. Twelve patients had AITL, 3 had adult T-cell leukemia/lymphoma (ATLL), 2 had PTCL not otherwise specified, 1 had enteropathy-associated T-cell lymphoma, and 1 had transformed mycosis fungoides.
At diagnosis, the median age was 71 (range, 39-85) for AITL patients and 59 (range, 32-83) for the other PTCL patients. Seventy-five percent of AITL patients had an IPI score of 3 to 5 and a PIT score of 3 to 4. Eighty-six percent of the other PTCL patients had an IPI score of 3 to 5, and 57% had a PIT score of 3 to 4.
At the time of 5-AZA treatment, all patients had stage III/IV disease. The AITL patients had received a median of 2 (range, 0-6) prior lines of therapy, and the other PTCL patients had received a median of 3 (range, 0-7).
Two patients did not receive chemotherapy before 5-AZA because of the presence of associated chronic myelomonocytic leukemia (CMML) that required treatment first.
Ninety-two percent of AITL patients had TET2 mutations (n=11), 33% had DNMT3A mutations (n=4), and 0% had IDH2 mutations. One of the non-AITL patients had a TET2 mutation.
Treatment
Patients received a subcutaneous injection of 5-AZA at 75 mg/m² for 7 consecutive days every 28 days until progression or unacceptable toxicity. Six patients also received 4 to 8 infusions of rituximab because of EBV-DNA positivity.
The patients received a median of 3 cycles of 5-AZA. At the time of analysis, 4 patients were still receiving therapy.
The median follow-up was 84 days (range, 19 to 1236).
Toxicity
“Hematological toxicity was as expected with 5-azacitidine,” Dr Delarue said.
However, 2 patients had “unusual” adverse reactions. One patient had grade 2 polyneuropathy, which was considered related to a paraneoplastic syndrome.
The other patient had grade 3 diarrhea related to colitis of unknown origin, and this led to treatment interruption.
There were no treatment-related deaths.
Efficacy
Dr Delarue noted that the ORR was significantly higher in AITL patients than in patients with the other PTCL subtypes (P=0.0198).
The ORR was 53% in the entire cohort (10/19), 75% (9/12) among AITL patients, and 14% among patients with other PTCLs (1/7).
“The only patient with a response in the ‘other PTCL’ group was a patient with HTLV1-associated ATLL . . . , but he relapsed a couple of weeks after the second cycle,” Dr Delarue explained.
Among the AITL patients, the CR rate was 42% (5/12), the partial response rate was 33% (4/12), and the rate of stable disease was 25% (3/12).
Six AITL patients eventually progressed—after 2, 2, 3, 4, 4, and 20 cycles of therapy, respectively.
Two AITL patients are off therapy but remain in CR after 9 and 10 months (5 and 6 cycles of treatment), respectively.
