Despite a variety of options, patients with relapsed/refractory acute myeloid leukemia (AML) continue to face poor prognoses, and a standard of care remains elusive, a hematologist/oncologist told colleagues.
“Clearly we have a problem with this group of patients,” Ehab Atallah, MD, professor of medicine at Medical College of Wisconsin, Milwaukee, said in a presentation at the virtual Acute Leukemia Forum of Hemedicus. In regard to treatments, he added, “we still have multiple unanswered questions.”
As Dr. Atallah noted, a 2018 study of 3,012 patients – in 9 successive ECOG‐ACRIN trials for newly diagnosed AML from 1984-2008 – showed poor outcomes for relapsed/refractory patients. At a median follow-up of 9.7 years, 59.1% reached first complete remission (CR1), and 58.9% of those relapsed. In the relapsed patients, the median overall survival from relapse was 0.5 years, and the overall survival (OS) over 5 years was 10%.
“Even among patients who relapsed with better prognostic factors – age < 40 and CR1 > 12 months – there was no significant OS difference between the studies,” the study noted. “In conclusion, this large cohort appears to confirm that the survival of AML patients post relapse continues to be dismal and has not improved during the past quarter of a century.”
There isn’t a clear standard of care, said Dr. Atallah, as shown by a 2014 phase 3 study of elacytarabine vs. investigator choice in relapsed/refractory AML patients. The investigators chose seven treatment options for the control arm.
So how can physicians make the best decisions about treatment? A 2018 report finds that some factors do offer guidance about how well relapsed patients will do, Dr. Atallah said, including worse prognoses for higher age (>50 years), time to relapse (< 1 year), number of cycles of treatment needed to achieve remission (more than 1), and unfavorable cytogenetics. And, he said, “practically no one is cured when their leukemia relapses without stem cell transplantation.”
Also keep comorbidities in mind, he said, and consider previous therapies – not just the ones implemented prior to their induction but from all treatments they received: “How much anthracycline did they get? Do they still have room to receive any more anthracycline? Do they have any pulmonary complications from GVHD [graft versus host disease]?”
Another tool may be helpful. A 2013 study found that geriatric assessment predicted survival for older adults with AML who took induction chemotherapy, he said. “I’m pretty sure that this geriatric assessment would also have significant prognostic information for patients with relapsed refractory AML.”
Molecular changes add to the complexity of treatment for relapsed/refractory AML, Dr. Atallah said, in light of new molecularly targeted drugs. He pointed to a 2019 study that showed a slight increase in median overall survival (9.3 months vs. 5.6 months) for gilteritinib vs. salvage chemotherapy in relapsed/refractory patients with FLT3-mutated AML. Other studies have shown limited effects of ID1 inhibitors, he said.
In the big picture, “there are many patient-, disease-, and prior-therapy-related variables that are involved in our decisions plus donor availability, social support, whether they have a transplant before, what kind of treatment they got before the functional assessment, and comorbidities. Even with the current choices for relapsed/refractory AML, the overall survival remains poor. Enrollment in clinical trials would be the best option for these patients.”
Dr. Atallah disclosed ties with Jazz, Abbvie, Takeda, Celgene, and Novartis.
The Acute Leukemia Forum is held by Hemedicus, which is owned by the same company as this news organization.
SOURCE: “Why Is There No Standard of Care for Relapsed AML?” Acute Leukemia Forum of Hemedicus, Oct. 15, 2020.