Given the number of studies examining this question and the high level of evidence generated, investigating this question was limited to examining randomized, controlled studies having tested a strategy based on biomarker measurement(s), to the exclusion of all other study designs.
However, these investigations were not based on biomarker discoveries from saliva specimens, rather they were testing blood biomarkers in saliva [45].
Yet there is little incentive to evaluate biomarkers, because the Food and Drug Administration does not require it and companies are not reimbursed as much for tests based on biomarkers as they are for new cancer drugs.
Importantly, any screening test based on biomarkers could be amenable to automation, producing substantial cost savings and the potential for applications in the developing world.
Additional, rapid tests, based on biomarkers that are specifically influenced by the presence of infection, may assist in the classification of patients.
20 35 The application of consultation techniques, such as 'safety-netting', the development of new service models such as outreach facilities for specialist consultation with urologists and the development of new tests (eg, based on biomarkers) are also worthy of exploration and prioritisation of research investment.
More recently, scores based on biomarkers have been proposed [ 11].
Due to tumor heterogeneity and the large amount of genes found to be mutated in CRC [ 99], a screening stool test solely based on mutation biomarkers would require testing a large number of genes.
These grades are based on FCAT testing.
