A Study of Tanezumab in Adults With Chronic Low Back Pain

Pfizer logo


Status and phase

Phase 2


Low Back Pain


Biological: Tanezumab 10 mg IV
Drug: Naproxen
Drug: Placebo for naproxen
Biological: Placebo for tanezumab
Biological: Tanezumab 5 mg IV
Biological: Tanezumab 20 mg IV

Study type


Funder types



CLBP-IV PH2B (Other Identifier)

Details and patient eligibility


The purpose of this study is to evaluate the efficacy and safety of multiple doses of tanezumab administered every 8 weeks in treating chronic low back pain. Tanezumab is a monoclonal antibody directed against human nerve growth factor.


1,359 patients




18+ years old


No Healthy Volunteers

Inclusion criteria

  • Present with duration of low back pain of ≥3 months requiring regular use of analgesic medication (>4 days per week for the past month). Analgesic medication may consist of NSAIDs, selective COX-2 inhibitors, immediate release opioids, or combinations, with certain protocol-defined limitations.
  • Primary location of low back pain must be between the 12th thoracic vertebra and the lower gluteal folds, with or without radiation into the posterior thigh
  • Must meet criteria for pain severity and global assessment of low back pain at Screening and Baseline visits
  • Female patients of child-bearing potential (and male patients with female partners who are of child-bearing potential) must use 2 methods of contraception throughout the study
  • Patients must be willing to discontinue all pain medications for chronic low back pain except rescue medication and not use prohibited pain medications throughout the duration of the study

Exclusion criteria

  • History of lumbosacral radiculopathy within the past 2 years.
  • Back pain due to visceral disorder (eg, endometriosis).
  • Back pain due to major trauma or osteoporotic compression fracture in the past 6 months.
  • History of rheumatoid arthritis, seronegative spondyloarthropathy, Paget's disease of spine, pelvis or femur; fibromyalgia; tumors or infections of the spinal cord.
  • Surgical intervention during the past 6 months for the treatment of low back pain or plans for surgical intervention during the course of the study.
  • Current or pending worker's compensation, litigation, disability, or any other monetary settlement regarding his/her CLBP or any other pain condition, or any closed claim within the past 5 years.
  • Use of any analgesic or muscle relaxant within 48 hours prior to the five days before Baseline
  • Patients receiving only acetaminophen, gabapentin or pregabalin to manage their chronic low back pain.
  • Patients taking >325 mg/day of aspirin.
  • Use of any antidepressants with the exception of stable treatment with selective serotonin reuptake inhibitors (SSRIs).
  • Use of any sedatives/hypnotics, anxiolytics, tranquilizers, or benzodiazepines unless daily dose has been stable and will remain unchanged throughout the study period.
  • Systemic corticosteroid therapy within 30 days (inhaled and topical corticosteroids are permitted).
  • Local or epidural injection of corticosteroids, as well as injections of corticosteroids in the back within 3 months.
  • Botulinum toxin (Botox®) injection for chronic low back pain within 4 months.
  • Requirement for new, concomitant physiotherapy including, but not limited to, transdermal electroneural stimulation (TENS), massage or spinal manipulation for the duration of the study period.
  • Active or suspected esophageal, gastric, pyloric channel, or duodenal ulceration within 3 months, or any history of gastrointestinal bleeding.
  • Current use of lithium or anticoagulant agents.
  • Known hypersensitivity or intolerance to NSAIDs; history of asthma, urticaria, or allergic type reactions after taking aspirin or NSAIDs.
  • Inflammatory bowel disease, a chronic or acute renal or hepatic disorder, a significant coagulation defect, or other condition that might preclude the use of an NSAID.
  • History of intolerance to acetaminophen or paracetamol or any of its excipients.
  • History of known alcohol, analgesic or narcotic abuse within 2 years.
  • Presence of drugs of abuse (including prescription medications without a valid prescription), other illegal drugs or marijuana in the urine toxicology screen obtained at Screening.
  • History of allergic or anaphylactic reaction to a therapeutic or diagnostic monoclonal antibody or IgG fusion protein.
  • Use of biologics other than study medication, including any live vaccines, within 3 months, or use during the study (intranasal Flumist® vaccine is an exception).
  • Signs and symptoms of clinically significant cardiac disease.
  • Diagnosis of a transient ischemic attack within the 6 months, or residual deficits from stroke that would preclude completion of required study activities.
  • History of cancer within 5 years.
  • Use of any investigational medication within 30 days (3 months for investigational biologics).
  • Expected to undergo a therapeutic procedure or to use any analgesic other than those specified in the protocol throughout the study period.
  • Previous exposure to exogenous NGF or to an anti NGF antibody.
  • Screening laboratory results and blood pressure within specified limits.
  • Positive Hepatitis B, Hepatitis C, or human immunodeficiency virus (HIV) tests at screening.
  • History, diagnosis, or signs and symptoms of clinically significant neurological disease.
  • History, diagnosis, signs or symptoms of any clinically significant psychiatric disorder.
  • Hospital admission for depression or suicide attempt within 5 years or active, severe major depression at Screening.
  • Likelihood of being non compliant with study procedures.

Trial design

Primary purpose




Interventional model

Parallel Assignment


Triple Blind

1,359 participants in 5 patient groups, including a placebo group

Tanezumab 20 mg IV
Experimental group
Biological: Tanezumab 20 mg IV
Drug: Placebo for naproxen
Tanezumab 10 mg IV
Experimental group
Drug: Placebo for naproxen
Biological: Tanezumab 10 mg IV
Tanezumab 5 mg IV
Experimental group
Biological: Tanezumab 5 mg IV
Drug: Placebo for naproxen
Active Comparator group
Biological: Placebo for tanezumab
Drug: Naproxen
Placebo Comparator group
Biological: Placebo for tanezumab
Drug: Placebo for naproxen

Trial contacts and locations



Data sourced from clinicaltrials.gov

Clinical trials

Find clinical trialsTrials by location
© Copyright 2024 Veeva Systems