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A 72-year-old male heavy smoker was diagnosed with stage IV non-small-cell lung cancer (NSCLC) with lung-to-lung metastasis. No druggable driver mutation was found and the tumour proportion score for programmed death (PD)-ligand 1 expression was 100% (Dako 22C3 assay). The result of sputum acid-fast staining, performed 1 month after the diagnosis, was positive. After confirmation by PCR (DR. MTBC ScreenTM IVD Kit), isoniazid, rifampin, ethambutol and pyrazinamide were administered for pulmonary tuberculosis (TB). A viral hepatitis panel performed before the administration of the anti-TB agents was negative for hepatitis B virus and hepatitis C virus infections. The patient’s liver enzyme levels were within the normal ranges before anti-TB agents, during anti-TB treatment and before immune-checkpoint inhibitor (ICI) treatment. Pembrolizumab monotherapy was administered 1 month after the administration of the anti-TB agents and sputum conversion. Unfortunately, the …
Contributors Conception and design of study: CLC. Acquisition of data: CYS. Drafting the manuscript: CYS, CIS. Revising the manuscript critically for important intellectual content: JYF, CLC. Approval of the version of the manuscript to be published: All authors.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests CLC received honoraria from AstraZeneca, Boehringer Ingelheim, Roche and Merck Sharp & Dohme.
Patient consent for publication Consent obtained directly from patient(s).
Provenance and peer review Not commissioned; externally peer reviewed.