GSTM1 and neoplasm: Finally, quantitative FIT, which give estimates of f-Hb, do fulfil many of the requirements of the ideal tumour marker, being non-invasive and with simple to use, hygienic, specimen collection devices.23 Further, it has been found that a majority of participants in a hypothetical study stated a preference for a surveillance test resembling FIT over colonoscopy; however, the authors did admit that research should test whether this translates to greater uptake in a real surveillance setting.24 And, compared to colonoscopy, FIT are very inexpensive.4