Basically arrested in his hometown, while visiting a private clinic, for chemo that had been running for ~1 year.

Yes, he was using a false identity, but the police know from a wiretapping which kind of cancer he had, then they made a data analysis on all the people in Sicily that had cancer. The funny detail is that he was arrested at less than 500 meters from the special investigation antimafia offices.

P.S. He is native from Trapani, not from Palermo.