1.	Prospective Study About Clinical and Pharmacogenetic Safety of Opioid Use for Chronic Pain Phase: Phase IV Type: Supportive care Status: Active Age: 18 and over Sponsor: Other Protocol IDs: PT-SM-1-Op-Cancer, NCT00916890
2.	A Study to Evaluate Efficacy and Safety of Oxycodone/Naloxone Compared to OxyContin in Korean Cancer Patients Phase: Phase IV Type: Supportive care Status: Active Age: 20 and over Sponsor: Pharmaceutical / Industry Protocol IDs: OXN10-KR-002, NCT01313780
3.	A Study to Assess the Efficacy and Safety of Oxycodone/Naloxone in Korean Patients With Chemotherapy-Induced Peripheral Neuropathy (CIPN) Phase: Phase IV Type: Supportive care Status: Active Age: 20 to 79 Sponsor: Pharmaceutical / Industry Protocol IDs: OXN12-KR-402, NCT01675531
4.	RCT Comparing the Analgesic Efficacy of 4 Therapeutic Strategies Based on 4 Different Major Opioids (Fentanyl, Oxycodone, Buprenorphine vs Morphine) in Cancer Patients With Moderate/Severe Pain, at the Moment of Starting 3rd Step of WHO Analgesic Ladder. Phase: Phase IV Type: Supportive care Status: Active Age: 18 and over Sponsor: Pharmaceutical / Industry Protocol IDs: Studio CERP, NCT01809106
5.	Safety of Fentanyl TAIFUN Treatment Phase: Phase III Type: Supportive care Status: Active Age: 18 and over Sponsor: Pharmaceutical / Industry Protocol IDs: CL_700_014, NCT00822614
6.	Use of Continuous Wound Infusion of Bupivacaine for Analgesia Following Axillary Clearance Surgery Phase: Phase III Type: Supportive care Status: Active Age: 18 and over Sponsor: Other Protocol IDs: AC-CUH, NCT01314144
7.	Safety of Twice Daily Oxycodone Hydrochloride Controlled-release Tablets in Children With Moderate to Severe Malignant and/ or Nonmalignant Pain Requiring Opioids Phase: Phase III Type: Supportive care Status: Active Age: 6 to 19 Sponsor: Pharmaceutical / Industry Protocol IDs: OTR3001, 2010-020471-23, NCT01192295
8.	Evaluation of the Efficacy and Safety of Two Methadone Titration Methods for the Treatment of Cancer-related Pain With Inadequate Pain Relief or Intolerable Side Effects When Treated With Level 3 Opioids. Phase: Phase III Type: Supportive care Status: Active Age: 18 and over Sponsor: Pharmaceutical / Industry Protocol IDs: 2011-004609-26, NCT01793480
9.	Pain After Tumescent Mastectomy or Standard Mastectomy in Women With Stage I, Stage II, or Stage III Breast Cancer Phase: No phase specified Type: Natural history/Epidemiology, Treatment Status: Active Age: 18 and over Sponsor: NCI, Other Protocol IDs: CDR0000633754, UCD-CCSO001, 200816282-1, CCSO001, NCT00859157