A Repeated-Dose Evaluation of Use of a Pain Relieving Drug and Safety of OROS Hydromorphone HCI in Patients With Chronic Cancer Pain

Inclusion Criteria: * Patients who have chronic cancer pain who are currently receiving strong oral or transdermal opioid analgesics or patients suitable for advancement of therapy to step 3 on the WHO (World Health Organization) analgesic ladder * patients who can reasonably be expected to have stable opioid requirements for the duration of the study Exclusion Criteria: * Patients intolerant of or hypersensitive to hydromorphone (or other opioid agonists) * patients who are pregnant or breast-feeding * patients with severe respiratory compromise or severely depressed ventilatory function * patients with any gastrointestinal disorder or acute abdominal conditions including pre-existing severe GI narrowing (pathologic or iatrogenic), that may affect the absorption or transit of orally administered drugs * patients with clinically significant impaired renal or hepatic function, Addison's disease, hypothyroidism, prostatic hypertrophy, or urethral stricture, dysphagia or are unable to swallow tablets or any significant CNS disorder, including but not limited to head injury, intracranial lesion, increased intracranial pressure, seizure disorder, stroke within the past 6 months, and disorders of cognition