Extension Study of ACTIQ Treatment for Children and Adolescents With Breakthrough Pain

Inclusion Criteria: Children are included in the study if all of the following criteria are met: * The patient completed participation in ACTIQ double blind study in compliance with the protocol * Written informed consent of the parent or legal guardian and patient assent, when appropriate, is obtained (lack of assent cannot be overturned) * The child is aged 3 to under 16 years (at the time of enrollment into the ACTIQ double blind study) and continues to weight at least 15kg * The child must continue using ATC opioid therapy for pain associated with cancer, sickle cell disease, or severe burns and be opioid-tolerant. Opioid tolerant patients are defined as patients who have taken at least 1 mg/kg/day or 40mg/day or more of oral morphine (or an equianalgesic dosage of another opioid) or at least 25 mcg/hour of transdermal fentanyl for at least 7 days. (ATC opioid therapy may be administered as patient controlled analgesia \[PCA\]). * The child must be experiencing episodes of BTP (defined as transient flares of pain that require a bolus of medication as treatment) as follows: * Patients with cancer must be experiencing an average of at least 1 BTP episode a day * Patients with non-cancer related pain must be experiencing an average of 2 BTP episodes a day * Girls who are postmenarch or sexually active must have a negative urine pregnancy test before entry into the study, must be using a medically acceptable method of birth control, and must agree to continue use of this method for the duration of the study (and for 30 days after participation in the study). Acceptable methods of birth control include: barrier method with spermicide; steroidal contraceptive (eg, oral, transdermal, implanted, or injected) in conjunction with a barrier method; intrauterine device (IUD); or abstinence * The child, in the opinion of the investigator, is able to administer ACTIQ treatment effectively (ie, adequately moving the unit around the mouth and sucking not biting the unit) * The child may be an inpatient or outpatient Exclusion Criteria: Children are excluded from participating in this study if 1 or more of the following criteria are met: * The child has pain uncontrolled by therapy, as determined by the investigator, that could adversely impact the safety of the patient or could be compromised by treatment with ACTIQ. * The child has known or suspected hypersensitivities/allergies or other contraindications to any ACTIQ component * The child has received monoamine oxidase inhibitors (MAOIs) within 14 days of the first dose of study drug administration * The child has moderate to severe oral mucositis * The child has a neuromuscular disease, significant renal impairment, or significant hepatic impairment as determined by the investigator * The child has any other medical condition or is receiving concomitant medication/therapy that would, in the opinion of the investigator, compromise the patient's safety or compliance with the study protocol, or compromise data collection * The child is receiving any experimental drug/therapy. NOTE: Children may not be participating concurrently in another study when the other study requires experimental drug therapy. * The child is receiving any other treatment that, in the opinion of the investigator, could interfere with the pain response * A female patient of childbearing potential, is pregnant, or is lactating (any girl becoming pregnant during the study will be withdrawn from the study) * The child has, in the opinion of the investigator, a development delay that would interfere with the use of ACTIQ therapy