Safety and Efficacy Study of Osmotic Release Oral System (OROS) Hydromorphone in Participants With Cancer Pain

OROS Hydromorphone will be administered as either 8, 12, 16, 20, 24, 32, 36 or 40 mg oral tablet once daily in the morning. For all participants, 24-hour stable opioid dose (of either morphine or oxycodone) will be converted to a single daily dose of OROS hydromorphone using standard equi-analgesic ratios and dose will be increased if needed, but not more than 40 mg and not more frequently than every two days. The study drug will be administered up to 28 days.