 The recruitment process will be programmed through the index case, that will be interviewed to obtain their CRC family history. FDR will be contacted in order to make an appointment in the High-risk CRC Clinic of the participant centers. Randomization will be performed before signing the informed consent to avoid selection bias. A researcher will be responsible to provide detailed information about the study and getting the informed consent. In case of willingness to participate in the study, the FDR will be randomized to one of the following arms: A One-time colonoscopy; B annual FIT for two screening rounds and a colonoscopy in case of a positive FIT cut-off 10 μg Hemoglobing feces. Screening uptake will be defined as the percentage of FDR who participate at least in one of the two FIT screening round in the FIT group or who undergo colonoscopy in the other group. Screening uptake will be calculated under the assumption of intention to screen analysis. 