Less research on tuberculosis than HIV and malaria when research agendas are poorly coordinated: a systematic review of research outputs from Cambodia

•This scoping review analysing trends in research into HIV, malaria, and tuberculosis (TB) in Cambodia, revealed that there is much less evidence to inform policy decisions from TB research than from HIV or malaria research.•Considering that TB causes more deaths in Cambodia than HIV and malaria, the review findings suggest that an increase in TB research may be needed.•To ensure that future research addresses critical information gaps for policy decisions, a coherent research strategy could be developed by a national committee supported by the donor and research community.