In this episode of Communicable, Navaneeth Narayanan and Josh Nosanchuk invite Virginie Lemiale and Elie Azoulay (Paris, France) as well as fellow editor Emily McDonald (Montreal, Canada)—this time as guest—to discuss adjunctive steroid therapy for pneumocystis pneumonia (PCP) in HIV-negative individuals. In 2025, Lemiale and Azoulay published results from their double-blind, randomised controlled trial investigating steroid treatment for severe Pneumocystis jirovecii pneumonia (PIC trial) in the Lancet Respiratory Medicine [1]. At first glance, one might dismiss the study’s clinical impact due the ‘negative' result of  the primary outcome, mortality at 28 days, which just missed a statistically significant difference between groups. There was a clinical difference, however, and all other outcomes, including 90-day mortality, were significantly different between groups. Understanding how pivotal these results were to clinical practice, McDonald and colleagues sought to contextualise the results of the PIC trial through a Bayesian analysis in a follow-up publication [2]. While the discussion provides useful clinical commentary, it also helps both to demystify Bayesian analysis and to call attention to what might be lost with strict or overly concrete interpretations of traditional frequentist analyses. 

This episode was peer reviewed by Arjana Zerja from the Mother Theresa University Hospital Center, Tirana, Albania.

References

1. Lemiale V, et al. Adjunctive corticosteroids in non-AIDS patients with severe Pneumocystis jirovecii pneumonia (PIC): a multicentre, double-blind, randomised controlled trial. Lancet Respir Med. 2025;13(9):800-808. doi:10.1016/S2213-2600(25)00125-0.
2. Lee TC, Albuquerque AM, McDonald EG. Contextualizing the use of corticosteroids in severe Pneumocystis jirovecii pneumonia through a Bayesian lens. CMI Commun. 2025;2(4):105141. doi:10.1016/j.cmicom.2025.105141.