Milan is easily reachable from three international airports: Milano Linate (about 12 km from Mario Negri Institute), Milano Malpensa (40 km) and Milano Orio al Serio (50 km, close to Bergamo):
From Milano Linate: you can take a taxi or a bus to Piazza San Babila, in the centre of Milan, where you can take the underground Linea 1 to the railway station Cadorna Ferrovie Nord. All trains leaving Cadorna station stop at the Milano Bovisa-Politecnico station. Exiting the Bovisa Politecnico stop you should take the stairs on the right and reach the main road. Take the left and follow the road, then take the first road on the right. After 100 m. take the first road on the left and the Istituto Mario Negri will be right in front of you (5 minutes walk).
From Milano Orio al Serio: there is a shuttle bus to the railway station Milano Centrale, from where you can use the subway Linea 2 to get the station Cadorna Ferrovie Nord and then, by train, the Mario Negri Institute (see above).
From Milano Malpensa: you can take the train called Malpensa Express and get off at the Milano Bovisa Politecnico station (see above).
If you already are in Milan, the easiest way to get Mario Negri Institute is by taking a train from Cadorna Station (see above).
By car coming from the centre of Milan take via Mac Mahon until you reach Piazza Pompeo Castelli. Take the first road on the right (via degli Ailanti), then the first on the left, under the railroad tunnel. After the tunnel turn to the left in via Giampietrino. Go straight in via La Masa and take the first road on the right