A Dose Titration Study of Fentanyl Buccal Soluble Film for Breakthrough Cancer Pain in Taiwan

Primary Objective: To determine the feasible dose range of Painkyl® required for Taiwanese population. Secondary Objectives: To evaluate the efficacy of Painkyl® by calculating squared mean of pain intensity difference at 30 minutes after taking Painkyl® (SPID30, an 11-point scale). To evaluate subjects' satisfaction by conducting global evaluation of medication performance (a 5-point categorical scale). To identify percentage of episodes requiring rescue medication during maintenance treatment period. To evaluate the safety data of Painkyl® for breakthrough pain.