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The PTEN Hamartoma Tumor Syndrome Foundation was founded to find treatments or therapies for PTEN Syndromes. Our team is developing research tools to complement existing research, including our IRB-approved patient registry and biorepository. We fund research, provide PHTS education, and support patients. PHTS includes Cowden syndrome (CS), Bannayan-Riley-Ruvalcaba syndrome (BRRS), PTEN-related Proteus syndrome (PS), and Proteus-like syndrome.