The Sequenced Treatment Alternatives to Relieve Depression (STAR*D) trial studied 2876 people with major depressive disorder to evaluate their response to depression treatment in a real-world setting. Unlike the randomized controlled trials that are often used to evaluate a drug’s efficacy, there were few exclusion criteria, the patient and their physician knew which drug they were taking, and patient choice was incorporated. Four sequential levels of treatment were established, and if a patient failed to achieve remission after 12-14 weeks, they would be moved to the next level. The target was full remission, unlike many other studies which measure response (i.e. a ≥50% reduction in symptom rating scale scores). Remission rates can be substantially lower than response rates, but are useful because there are better long-term outcomes for people who do achieve full remission.
Level 1 treatment consisted of citalopram, and 28% of patients achieved remission based on the Hamilton Rating Scale for Depression (HAM-D). Certain factors were identified, such as other comorbid mental illnesses, that were associated with lower or higher remission rates.
In level 2, patients were offered cognitive psychotherapy, a switch to another antidepressant (randomly selected), or the addition of another medication to augment the treatment. Among level 2 patients who switched to another medication, remission rates were 21.3% for bupropion, 17.6% for sertraline, 24.8% for venlafaxine. Rates were similar among those patients who switched to cognitive psychotherapy. Among the patients who received augmentation treatment, the remission rates were approximately 30% for both bupropion and buspirone. Augmentation with medication produced more rapid remission than augmentation with cognitive psychotherapy.
In level 3, patients who switched medication were randomly assigned to mirtazapine or nortriptyline, and patients who received an medication for augmentation were randomly assigned to lithium or the T3 form of thyroid hormone (liothyronine). Remission rates were 12.3% for mirtazapine, 19.8% for nortriptyline, 15.9% for lithium, and 24.7% for thyroid hormone.
In level 4, patients were randomly assigned to switch to either tranylcypromine (an MAOI antidepressant) or venlafaxine plus mirtazapine. Remission rates were 6.9% for tranylcypromine and 13.7% for venlafaxine plus mirtazapine.
Altogether, 67% of patients were able to achieve remission. The study found that people may still remit by 12 weeks even if there’s only a modest symptom reduction at 6 weeks. However, the more treatment steps that are required, the lower the chance of a patient achieving remission and the higher the chance of intolerable side effects and relapse.
Personally I found the take-home message from this study rather discouraging. During my last hospitalization I argued that my suicide attempt was supported by the STAR*D’s not so subtle hint that I was shit outta luck. I think it’s crucial that we find new kinds of treatment that will help that 33% of people who are treatment-resistant and just aren’t achieving remission with many currently available antidepressant medications. This study doesn’t consider all potential treatments; for example, atypical antipsychotics, ketamine, and ECT aren’ included, and psychotherapy plays a limited part. Still, we deserve better. A lot better.
For more info on the research terminology I’ve used in this post, see my post on research literacy.
You can find out more about these medications in my book Psych Meds Made Simple: How & Why They Do What They Do, available on Amazon.