Terminated early due to administrative reasons.

The purpose of the extension phase is to evaluate the long-term safety and tolerability of buprenorphine transdermal system (BTDS). Subjects begin the extension phase on BTDS 5 mcg/h and may up- or down-titrate the dose [up to BTDS 20 micrograms (mcg) / hour (h)] depending on adequate pain relief and tolerability.

Buprenorphine is a synthetic opioid analgesic with over 25 years of international clinical experience indicating it to be safe and effective in a variety of therapeutic situations for the relief of moderate to severe pain.

Inclusion Criteria:

• Subjects who completed all visits of the double-blind phase on study drug, and subjects who discontinued study drug due to lack of therapeutic effect in the double-blind phase but completed all visits of the double-blind phase off study drug are eligible to enroll in the extension phase.
• For subjects entering the extension, 4 electrocardiograms (ECGs) are required at entry if none were collected prior to randomization while on BTDS 20. NOTE: Subjects with any 1 QT data corrected for heart rate using the Fridericia formula (QTcF) interval ≥ 500 milliseconds (msec) would be discontinued from the extension phase

Exclusion Criteria:

• Subjects requiring long-acting opioid analgesics [once- or twice-daily dosing with a every (q) 24 hours (h) or q12h drug] or transdermal fentanyl during the extension phase should be discontinued from the study.