Table 3.

CCDTs used in studies

Name	Cancer type	Format	Use and development
Risk Assessment Tool (RAT)	Lung, colorectal	Desk based	Quantifies risk of cancer in symptomatic primary care patients. Consists of risk score for high-risk symptoms in isolation, for repeat presentation of the same symptom and in combination with one other symptom. Positive predictive Values for symptoms of cancer, developed through series of population-based case and control studies in primary care setting.
Electronic RAT	Lung (non-smokers), lung (smokers), colorectal	Electronic	Electronic version of clinical decision Risk Assessment Tools described above.
QCancer	Lung, colorectal, gastro-oesophageal, pancreatic, blood, renal, prostate and various others	Electronic	QCancer algorithms can be used to calculate the percentage probability of having an undiagnosed cancer. Developed using QResearch database in a series of prospective cohort studies, it incorporates a range of risk factors.
Electronic clinical decision support 7 Point Check List	Melanoma	Electronic	Electronic Clinical Decision Support for assessment of pigmented lesions. Integrated into EMIS clinical system. A validated diagnostic checklist of 7 weighted features of a pigmented lesion. A score of 3 or more is suspicious of a diagnosis of melanoma.

CCDT, Clinical Cancer Decision Tool.