Harrison's PodClass: Internal Medicine Cases and Board Prep Ep 136: A 71-Year-Old Man with Prostate Cancer
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Mar 6, 2025 A 71-year-old man's participation in a prostate cancer trial reveals fascinating insights about the placebo effect. The discussion delves into ethical considerations and informed consent, enhancing our understanding of clinical trials. It then unpacks how patient expectations inform their responses, supported by psychological studies and neuroimaging. Misconceptions about placebo controls are addressed in an engaging format, making complex concepts accessible and intriguing.
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Use Placebo Controls To Isolate Drug Effects
- Use randomized placebo-controlled trials to isolate a drug's true effect from placebo, natural history, regression to the mean, and Hawthorne effects.
- Cathy Handy Marshall explains that subtracting placebo-arm outcomes controls for these four confounders, making such trials the gold standard.
Account For Regression To Mean And Hawthorne
- Design trials to account for regression to the mean and Hawthorne effects by including placebo arms and appropriate randomization.
- Cathy Handy Marshall highlights regression to mean and behavior changes when observed as confounders controlled by placebo arms.
Placebos Can Harm As Well As Help
- Placebo treatments can produce measurable therapeutic benefits and also notable side effects called nocebo effects.
- Cathy Handy Marshall notes about 25% of placebo participants report side effects, sometimes similar to the active drug arm.
