SIAE and neoplasm: Of the ten such KOs found in our metagenomes, seven (two arylsulfatases, an uncharacterized sulfatase, α-L-fucosidase, sialate O-acetylesterase, α-N-acetylglucosaminidase, 1,4-β-poly-N-acetylglucosaminidase) were positively correlated with tumor count (ρ > 0.47, P <0.01).