Sonic hedgehog (Shh) signaling pathway has emerged as a critical component of bladder development, cancer initiation, and progression. While the role of Shh signaling in bladder development is well documented, its role in bladder cancer progression is uncertain. Additionally, epithelial-to-mesenchymal transition (EMT) has been identified to promote bladder cancer progression in the initial stages and also contribute to drug resistance in the later stage and ultimately metastasis. We speculate that epithelial-to-mesenchymal transitions (EMT) and Shh fuel the carcinogenesis process. This review presents the most recent studies focusing on the role of Shh signaling in bladder cancer progression.
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