Complex sentence: Mutation of the PTEN gene underlies this syndrome, as well as Cowden syndrome, Proteus syndrome, and Proteus-like syndrome these four syndromes are referred to as PTEN Hamartoma-Tumor Syndromes (PHTS).
Split into simpler sentences: Mutation of the PTEN gene underlies this syndrome, as well as Cowden syndrome, Proteus syndrome, and Proteus-like syndrome. Collectively, these four syndromes are referred to as PTEN Hamartoma-Tumor Syndromes (PHTS).