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Hussain Almasmoum Laboratory Medicine Department, Faculty of Applied Medical Science, Umm Al-Qura University, Makkah, 7607, Saudi ArabiaCorrespondence: Hussain AlmasmoumLaboratory Medicine Department, Faculty of Applied Medical Science, Umm Al-Qura University, Al Abdeyah, Makkah, 7607, Saudi ArabiaTel +966 125270000-ext4521Email haamasmoum@uqu.edu.saAbstract: Colorectal cancer (CRC) is one of the most common types of cancers. It is associated with a poor prognosis and high mortality. The role of mucins (MUCs) in colon tumorigenesis is unclear, but it might be significant in the progression of malignancy. Some mucins, such as MUC1 and MUC13, act as oncogenes, whereas others, such as MUC2 and MUC6, are tumor suppressors. However, there are still mucins with unidentified roles in CRC. In this review, we discuss the reported roles of mucins in CRC. Moreover, we review the capability of the mucin family to serve as a sensitive and specific histopathological marker for the early diagnosis of CRC. Lastly, the role of mucin genes clustered on chromosome 7q22 in CRC and other cancers is also discussed.Keywords: colorectal cancer, mucins, MUC3, MUC12, MUC17, chromosome 7q22.1