Study: NCT04017845

Intervention type: DIAGNOSTIC_TEST
Group type: ACTIVE_COMPARATOR
Intervention: FIT
Description: Screenees were supplied with two fecal collection devices and asked to collect two specimens from two consecutive Different Bowel Movement Samples (DBMS) or, in case of infrequent bowel movements, from the Same Bowel Movement Sample (SBMS).Instruction stressed that after collection the device must be stored in refrigerator and transported in an iced pack within no more than 48h from sampling. After checking for sampling appropriateness, the received samples were analyzed by the FOB Gold/SENTiFOB method (Sentinel Diagnostics SpA, Milan, Italy), according to the previously validated procedural platform

Intervention type: DIAGNOSTIC_TEST
Group type: ACTIVE_COMPARATOR
Intervention: FIT
Description: Screenees were supplied with two fecal collection devices and asked to collect two specimens from two consecutive Different Bowel Movement Samples (DBMS) or, in case of infrequent bowel movements, from the Same Bowel Movement Sample (SBMS).Instruction stressed that after collection the device must be stored in refrigerator and transported in an iced pack within no more than 48h from sampling. After checking for sampling appropriateness, the received samples were analyzed by the FOB Gold/SENTiFOB method (Sentinel Diagnostics SpA, Milan, Italy), according to the previously validated procedural platform

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: Precolonoscopy cleansing regimen
Description: Laxative stimulant two days prior to the cleansing regimen involves the intake of one 10 mg tablet of bisacodyl (Dulcolax, Sanofi,UK) at 18:00 for two consecutive nights.The evening before colonoscopy cleansing started with 2 doses (at 16:00 and 20:00) of one sachet Sodium picosulphate preparations (PICOPREP, Ferring Pharmaceutical Co., Ltd., Zhongshan, China), dissolved in150 mL of cold water, followed with five 240 mL portions of clear liquids within 3 h. The third dose is taken in the morning about 5 h prior to colonoscopy, followed with at least three 240 mL portions of clear liquids no later than 2 h before colonoscopy.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: Precolonoscopy cleansing regimen
Description: Laxative stimulant two days prior to the cleansing regimen involves the intake of one 10 mg tablet of bisacodyl (Dulcolax, Sanofi,UK) at 18:00 for two consecutive nights.The evening before colonoscopy cleansing started with 2 doses (at 16:00 and 20:00) of one sachet Sodium picosulphate preparations (PICOPREP, Ferring Pharmaceutical Co., Ltd., Zhongshan, China), dissolved in150 mL of cold water, followed with five 240 mL portions of clear liquids within 3 h. The third dose is taken in the morning about 5 h prior to colonoscopy, followed with at least three 240 mL portions of clear liquids no later than 2 h before colonoscopy.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: Conventional Colonoscopy
Description: With the colonoscopists completely blinded regarding the FIT results, conventional colonoscopy examinations were conducted in the Endoscopy Unit of Al-Kindy Polyclinic. According to the five levels of competency proposed by the European guidelines, this unit is assigned as level 2, with the possibility of removing polypoid and sessile lesions \<25 mm, providing there is good access. For flat lesions, larger sessile and polypoid lesions, and smaller lesions with more difficult access, the lesions were documented appropriately with the patients referred to higher competent units in order to be safely and expertly removed.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: Conventional Colonoscopy
Description: With the colonoscopists completely blinded regarding the FIT results, conventional colonoscopy examinations were conducted in the Endoscopy Unit of Al-Kindy Polyclinic. According to the five levels of competency proposed by the European guidelines, this unit is assigned as level 2, with the possibility of removing polypoid and sessile lesions \<25 mm, providing there is good access. For flat lesions, larger sessile and polypoid lesions, and smaller lesions with more difficult access, the lesions were documented appropriately with the patients referred to higher competent units in order to be safely and expertly removed.

Intervention type: DIAGNOSTIC_TEST
Group type: ACTIVE_COMPARATOR
Intervention: Histopathological examinations of screen-detected lesions
Description: Adenomas were classified according to the modified revised Vienna classification for the European Guidelines. Advanced adenoma was defined as the presence of one of the following features: \>10 mm diameter, tubulovillous or villous structure, and high-grade neoplasia. Polypoid adenocarcinomas were reported according to the TNM classification, while colorectal cancer associated with flat and/or depressed lesions were reported as non-polypoid lesions, and further classified by the Paris classification. Pathologic results of hyperplastic polyps, sessile serrated lesions or post inflammatory polyps were considered normal findings.

Intervention type: DIAGNOSTIC_TEST
Group type: ACTIVE_COMPARATOR
Intervention: Histopathological examinations of screen-detected lesions
Description: Adenomas were classified according to the modified revised Vienna classification for the European Guidelines. Advanced adenoma was defined as the presence of one of the following features: \>10 mm diameter, tubulovillous or villous structure, and high-grade neoplasia. Polypoid adenocarcinomas were reported according to the TNM classification, while colorectal cancer associated with flat and/or depressed lesions were reported as non-polypoid lesions, and further classified by the Paris classification. Pathologic results of hyperplastic polyps, sessile serrated lesions or post inflammatory polyps were considered normal findings.

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Tribenoside 400 mg + lidocaine 40 mg suppositories
Description: Treatment of hemorrhoids was initiated with tribenoside 400 mg + lidocaine 40 mg suppositories, once daily for up to 2 weeks.