Table 1 Eligibility criteria

● Primary study with original data

● Observational study design (prospective/retrospective cohort study, case–control study, cross-sectional study)

● The study population consists only of cancer patients, haematological or otherwise, of any age, sex, or ethnicity, and in any institution in any country

● The study includes a multivariable model

● A resistant bacterial or resistant fungal infection is either a risk factor or an outcome

● The outcome is either infection (or colonisation) or death

● Published after 1st of January 2015

● Published in English

● Studies in humans

● Any other publication type than a primary observational study

● Cancer is a covariate or comparator, not everyone in the study population has cancer

● Resistance to antimicrobial drugs is not included in the model (neither as a risk factor nor as an outcome)

● The outcome is not infection or mortality, e.g. distribution of bacteria or bacterial strains

● Studies where the causal assumption is reversed, so that infection causes cancer (e.g. increased risk of gastric cancer after Helicobacter pylori infection)