Review of ketamine for depression in adults with cancer: fast relief, limited long-term data

The question

Can ketamine help with depression in adults who have cancer, and how safe is it in that group?

What they did

Researchers ran a systematic review, meaning they searched the published literature in a structured, pre-registered way and summarized the studies they found. They searched six large research databases and screened 4,256 citations, leaving 3,036 unique records after duplicates were removed. Fourteen studies met their criteria, including randomized controlled trials, cohort studies and case-control studies of adults with cancer.

What they found

Across the included studies, ketamine was reported to ease depressive symptoms quickly, often within hours to days rather than the weeks typical of standard antidepressants. The authors also noted reported benefits for anxiety, pain and quality of life. Short-term side effects included fatigue, dizziness and dissociation, which is a temporary sense of detachment from oneself or one’s surroundings. Data on long-term safety were limited.

The fine print

The abstract reports no pooled participant numbers, no effect sizes and no formal quality rating of the included studies, so the strength of the underlying evidence cannot be judged from it. Mixing randomized trials with cohort and case-control studies makes the overall conclusion weaker than a review of trials alone. Follow-up appears short, and long-term safety, best dosing and who benefits most remain unanswered. This summary is based only on the abstract.

What it means

In people with cancer, ketamine has been studied as a fast-acting option for depression, and early findings look promising for short-term symptom relief, but the evidence base is small and mixed, and long-term safety is not established.

Evidence grade: Low. A systematic review that pools together randomized trials, cohort studies and case-control studies, describes results narratively without combined numbers, and does not report a total number of participants.

This summary is based on the study’s published abstract.