Live-imaging Analyses Using Small Fish Models Reveal New Mechanisms That Regulate Primary Tumorigenesis

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Since the 1980s, zebrafish (Danio rerio) have been used as a valuable model system to investigate developmental processes because they: 1) grow outside their mothers; 2) are transparent during the embryonic stage; and 3) have organs similar to those in humans. Recently, zebrafish have emerged as a powerful model animal for studying not only developmental biology but also human diseases, especially cancer. Owing to the significant advantages of zebrafish, such as low-cost breeding, high efficiency of transgenesis, and ease of in vivo imaging and oncogenic/tumor cell induction, zebrafish offer a unique opportunity to unveil novel mechanisms of cancer progression, invasion, and metastasis. In addition, the small size of zebrafish larvae enables high-throughput chemical screening, and this advantage contributes to generating useful platforms for antitumor drug discovery. Owing to these various merits, which other model animals (such as fly, mouse, and rat) do not possess, zebrafish could achieve a unique status in cancer research. In this review, we discuss the availability of zebrafish for studying cancer and introduce recent cancer studies that have used zebrafish.

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