Integrated data
In further analysis of integrated data from four zuranolone clinical trials in the NEST and LANDSCAPE programs for patients with MDD and postpartum depression, results showed similar improvements at day 15 for zuranolone in QoL and overall health across all of the SF-36v2 functioning and well-being domains (P <.05), with the exceptions of physical measure and bodily pain.
By day 42, all of the domains showed significantly greater improvement with zuranolone versus placebo (all, P <.05).
Among the strongest score improvements in the integrated trials were measures in social functioning, which improved from baseline scores of 29.66 to 42.82 on day 15 and to 43.59 on day 42.
Emotional domain scores improved from 24.43 at baseline to 39.13 on day 15 and to 39.82 on day 42. For mental health, the integrated scores for the zuranolone group improved from 27.13 at baseline to 42.40 on day 15 and 42.62 on day 42.
Of note, the baseline scores for mental health represented just 54.3% of those in the normal population; with the increase at day 15, the level was 84.8% of the normal population.
“Across four completed placebo-controlled NEST and LANDSCAPE clinical trials, patient reports of functional health and well-being as assessed by the SF-36v2 indicated substantial impairment at baseline compared to the population norm,” the researchers reported.
The improvements are especially important in light of the fact that in some patients with MDD, functional improvement is a top priority.
“Patients have often prioritized returning to their usual level of functioning over reduction in depressive symptoms, and functional recovery has been associated with better prognosis of depression,” the investigators wrote.
Zuranolone trials have shown that treatment-emergent adverse events (AEs) occur among about 60% of patients, versus about 44% with placebo. The most common AEs are somnolence, dizziness, headache, sedation, and diarrhea, with no increases in suicidal ideation or withdrawal.
The rates of severe AEs are low, and they are observed in about 3% of patients, versus 1.1% with placebo, the researchers noted.
Further, as opposed to serotonergic antidepressants such as SNRIs and SSRIs, zuranolone does not appear to have the undesirable side effects of decreased libido and sexual dysfunction, they added.
Clinically meaningful?
Andrew J. Cutler, MD, clinical associate professor of psychiatry at State University of New York, Syracuse, said the data are “very significant” for a number of reasons.
“We need more options to treat depression, especially ones with novel mechanisms of action and faster onset of efficacy, such as zuranolone,” said Dr. Cutler, who was not involved in the current study. He has coauthored other studies on zuranolone.
Regarding the study’s QoL outcomes, “while improvement in depressive symptoms is very important, what really matters to patients is improvement in function and quality of life,” Dr. Cutler noted.
Also commenting on the study, Jonathan E. Alpert, MD, PhD, chair of the department of psychiatry and behavioral sciences and professor of psychiatry, neuroscience, and pediatrics at Albert Einstein College of Medicine, New York, said the investigational drug could represent an important addition to the armamentarium for treating depression.
“Zuranolone has good oral bioavailability and would represent the first neuroactive steroid antidepressant available in oral form and, indeed, the first non–monoamine-based antidepressant available in oral form,” he said in an interview.
Courtesy Dr. Jonathan E. Alpert
Dr. Jonathan E. Alpert
Dr. Alpert was not involved in the research and has no relationship with the drug’s development.
He noted that although there are modest differences between the patients who received zuranolone and those who received placebo in the trials, “this may have been related to high placebo response rates, which often complicate antidepressant trials.
“Further research is needed to determine whether differences between zuranolone and placebo are clinically meaningful, though the separation between drug and placebo on the primary endpoint, as well as some other measures, such as quality of life measures, is promising,” Dr. Alpert said.
However, he added that comparisons with other active antidepressants in terms of efficacy and tolerability remain to be seen.
“Given the large number of individuals with major depressive disorder who have incomplete response to or do not tolerate monoaminergic antidepressants, the development of agents that leverage novel nonmonoaminergic mechanisms is important,” Dr. Alpert concluded.
The study was funded by Sage Therapeutics and Biogen. Dr. Cutler has been involved in research of zuranolone for Sage Therapeutics. Dr. Alpert has reported no relevant financial relationships.
A version of this article first appeared on Medscape.com.