A Clinical Study To Investigate The Effectiveness And Safety Of Tanezumab In Treating Pain Associated With Endometriosis

Worst Daily Endometriosis Pain Score at Baseline, Weeks 4, 8, 12, and 16

Participants assessed worst endometriosis pain in the last 24 hours on an 11-point NRS of 0 to 10, where 0 = no pain and 10 = pain as bad as you can imagine. Higher score indicated greater pain. Baseline value was calculated as mean of the scores over 28 days in the baseline observation period. Post-baseline value was calculated as mean of the scores over the 28-day period preceding the post-baseline visit.

Time frame: Baseline, Weeks 4, 8, 12, and 16

Worst Daily Endometriosis Pain Score During Menstruation at Baseline, Weeks 4, 8, 12, and 16

Participants assessed worst endometriosis pain during menstruation in the last 24 hours on an 11-point NRS of 0 to 10, where 0 = no pain and 10 = pain as bad as you can imagine. Higher score indicated greater pain. Baseline value was calculated as mean of the scores over the episode of menstruation (at least 3 days of spotting or bleeding) for the 28-day period in the baseline observation period. Post-baseline value was calculated as mean of the scores over the episode of menstruation (at least 3 days of spotting or bleeding) for the 28-day period preceding the post-baseline visit.

Time frame: Baseline, Weeks 4, 8, 12, and 16

Worst Daily Non-Menstrual Endometriosis Pain Score at Baseline, Weeks 4, 8, 12, and 16

Participants assessed worst endometriosis non-menstrual pain in the last 24 hours on an 11-point NRS of 0 to 10, where 0 = no pain and 10 = pain as bad as you can imagine. Higher score indicated greater pain. Baseline value was calculated as mean of the scores on non-menstrual days for the 28-day period in the baseline observation period. Post-baseline value was calculated as mean of the scores on non-menstrual days for the 28-day period preceding the post-baseline visit.

Time frame: Baseline, Weeks 4, 8, 12, and 16

Average Pain Score With Intercourse at Baseline, Weeks 4, 8, 12, and 16

Pain related to sexual intercourse was defined as the discomfort or pain that may occur during or after sexual intercourse with vaginal penetration. Participants assessed pain during or after sexual intercourse on an 11-point NRS of 0 to 10, where 0 = no pain and 10 = pain as bad as you can imagine. Higher score indicated greater pain. Baseline value was calculated as mean of the scores over 28 days in the baseline observation period. Post-baseline value was calculated as mean of the scores over the 28-day period preceding the post-baseline visit.

Time frame: Baseline, Weeks 4, 8, 12, and 16

Endometriosis Symptom Severity Score (ESSS) Total Score at Baseline, Weeks 4, 8, 12, and 16

Investigator assessed the severity of the dysmenorrhea (menstrual pain), pelvic pain and dyspareunia (painful sexual intercourse) experienced by participants occurring during the most recent menstrual cycle on a 4-point scale, where 0 = absent, 1 = mild, 2 = moderate, and 3 = severe. Total score was calculated as a sum of the individual pain scores for dysmenorrhea, dyspareunia and pelvic pain. The total score range: 0 (no pain) to 9 (worst possible pain).

Time frame: Baseline, Weeks 4, 8, 12, and 16

Endometriosis Health Profile 30 (EHP-30) Score at Baseline and Week 8

EHP-30 is a validated quality of life (QoL) scale assessing emotional, physical and sexual function. EHP-30 consists of 30 items that assess the frequency of physical and mental manifestations of endometriosis during the previous 4 weeks on a 5-point Likert scale (0 = never, 1 = rarely, 2 = sometimes, 3 = often, 4 = always).. Scores for 6 domains (pain, control and powerlessness, emotional well-being, social support, self image, and sexual intercourse) were obtained as a sum of all relevant item scores and transformed to a 0 to 100 score range. Each domain score ranges from 0 (best possible health status) to 100 (worst possible health status).

Time frame: Baseline and Week 8

Global Response Assessment (GRA) at Week 8

GRA questionnaire is a 7-point symmetric scale which measures participant-reported overall response to treatment compared to baseline as 1 of the following possible responses: markedly worse, moderately worse, slightly worse, no change, slightly improved, moderately improved, and markedly improved. Number of participants with each response is reported.

Time frame: Week 8

Participant Global Satisfaction at Week 8

Participant global satisfaction is assessed using Patient Reported Treatment Impact (PRTI) which is a self-administered questionnaire containing four items to assess participant satisfaction, previous treatment, preference and willingness to continue using the study medication. Participant's response is rated on a 5-point scale where 1 = extremely satisfied, 2 = satisfied, 3 = neither satisfied nor dissatisfied, 4 = dissatisfied and 5 = extremely dissatisfied. Number of participants with each response is reported.

Time frame: Week 8

Participant Global Preference at Week 8

Participant global preference is assessed using PRTI, which is a self-administered questionnaire containing four items to assess participant satisfaction, previous treatment, preference and willingness to continue using the study medication. Participant reported previous treatment under following categories: hormonal contraceptive, painkiller, and hormone treatment by injection, hormone treatment by tablet, surgery, and no treatment. Participant preference was assessed using following categories: definitely prefer study medication, slightly prefer study medication, no preference, slightly prefer previous treatment, and definitely prefer previous treatment. Number of participants under each of the categories is reported. For previous treatment, a single participant may be represented in more than 1 category.

Time frame: Week 8

Participant Willingness to Re-use Study Medication

Participant willingness to re-use study medication is assessed using PRTI, which is a self-administered questionnaire containing four items to assess participant satisfaction, previous treatment, preference and willingness to continue using the study medication. Participant willingness to re-use study medication was assessed using following categories: definitely want to re-use, might want to re-use, not sure, might not want to re-use, definitely would not want to re-use.

Time frame: Week 8

Plasma Nerve Growth Factor (NGF) Concentration

Time frame: Day 1, Week 8, and Week 16 (End of Treatment)

Amount of Rescue Medication Used

Mean amount of daily rescue medication (acetaminophen 500 mg tablet/capsule) taken for endometriosis associated pain (in mg) was assessed.

Time frame: Baseline, Weeks 4, 8, 12, and 16

Number of Participants With Treatment Emergent Adverse Events (AEs) and Serious Adverse Events (SAEs)

An AE was any untoward medical occurrence in a participant who received study medication without regard to possibility of causal relationship. SAE: an AE resulting in any of following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Treatment-emergent are events between first dose of study medication and up to 113 days after last dose that were absent before treatment or worsened relative to pre-treatment state.

Time frame: Baseline up to 113 days after last dose of study medication

Number of Participants With New or Worsened Neurological Examinations

A neurological evaluation was performed by a consulting neurologist if adverse events suggested new or worsening peripheral neuropathy with respect to baseline or any adverse event of abnormal peripheral sensation was recorded. A neurological evaluation was done as soon as the above signs and symptoms were known, preferably within 7 days of becoming aware of such problems if possible. Neurological evaluation was done using Neuropathy Impairment Score (NIS) by investigator. Neurologic examination assessment included strength of groups of muscles of the head and neck, upper limbs and lower limbs, deep tendon reflexes and sensation (tactile, vibration, joint position sense and pin prick) of index fingers and great toes. Abnormality was judged by the investigator.

Time frame: Weeks 2, 4, 8, 12, and 16

Number of Participants With Anti-Drug Antibody (ADA)

Serum samples were analyzed for the presence or absence of anti-tanezumab antibodies using validated semi-quantitative enzyme linked immunosorbent assay (ELISA).

Time frame: Day 1 (pre-dose), Weeks 2, 4, 8, and 16

Number of Participants With Positive Urine or Serum Pregnancy Test

Time frame: Screening, Weeks 2, 4, 8, 12, and Early termination