1 23 Supportive Care in Cancer ISSN 0941-4355 Support Care Cancer DOI 10.1007/s00520-014-2491-x Long-term efficacy and tolerability of intranasal fentanyl in the treatment of breakthrough cancer pain Sebastiano Mercadante, Renato Vellucci, Arturo Cuomo, Claudio Adile, Andrea Cortegiani, Alessandro Valle, Patrizia Villari, et al.