This gene belongs to the protocadherin gene family, a subfamily of the cadherin superfamily. The encoded protein contains six extracellular cadherin domains, a transmembrane domain, and a cytoplasmic tail differing from those of the classical cadherins. The encoded protein may play a role in the establishment and function of specific cell-cell connections in the brain. PCDH17 promoter methylation is found to be closely associated with bladder cancer malignancy 
^Nollet F, Kools P, van Roy F (Jul 2000). "Phylogenetic analysis of the cadherin superfamily allows identification of six major subfamilies besides several solitary members". J Mol Biol. 299 (3): 551–72. doi:10.1006/jmbi.2000.3777. PMID10835267.