Patient description: A 58-year-old African-American woman presents to the ER with episodic pressing/burning anterior chest pain that began two days earlier for the first time in her life. The pain started while she was walking, radiates to the back, and is accompanied by nausea, diaphoresis and mild dyspnea, but is not increased on inspiration. The latest episode of pain ended half an hour prior to her arrival. She is known to have hypertension and obesity. She denies smoking, diabetes, hypercholesterolemia, or a family history of heart disease. She currently takes no medications. Physical examination is normal. The EKG shows nonspecific changes.

Clinical trial eligibility criteria: eligible ages (years): 18.0-999.0,  Back Pain Low Back Pain Neuropathic Pain Informed consent signed Male or female 18 years of age or older Women of childbearing potential must have a negative pregnancy test at the Enrollment Visit Women of childbearing potential must practice medically acceptable methods of birth control during the trial Participant must be appropriately communicative and able to differentiate with regard to location and intensity of the pain, and to complete the questionnaires used in this trial Participants must have a diagnosis of chronic low back pain; chronic pain defined as pain lasting for at least 3 months prior to enrollment Participant's pain must require a strong analgesic (defined as World Health Organization Step III) as judged by the investigator Participants who require a washout of co-analgesics at enrolment must have an average pain score (NRS-3) of 5 points or higher. Participants who do not require a washout of co-analgesics at enrollment must have an average pain intensity score (NRS-3) during the last 3 days of 6 points or higher The painDETECT diagnostic screening questionnaire must be either "positive" (score of 19 to 38 inclusive) or "unclear" (score of 13 to 18 inclusive). If the participant is being treated with a stable regimen of centrally acting co-analgesics, a "negative" painDETECT score (score 9 points or higher) prior to allocation to treatment  Presence of a clinically significant disease or clinical laboratory values that in the investigator's opinion may affect effectiveness, quality of life, or safety/tolerability assessments Presence of active systemic or local infections that may, in the opinion of the investigator, affect the effectiveness, quality of life, or safety/tolerability assessments Employees of the investigator or trial site, with direct involvement in this trial or other trials under the direction of the investigator or trial site, as well as family members of employees of the investigator Participation in another trial concurrently, or within 4 weeks prior to the Enrollment Visit Known to or suspected of not being able to comply with the protocol and/or appropriate use of the Investigational Medicinal Products Any painful procedures (e.g., major surgery) scheduled during the trial duration (Enrollment Visit until Final Evaluation Visit) that may, in the opinion of the investigator, affect the effectiveness, quality of life, or safety assessments Pending litigation or application for insurance/governmental benefits due to chronic pain or disability and/or if the granted benefits might be influenced by a successful participation in the trial Low back pain caused by cancer and/or metastatic diseases History of alcohol or drug abuse, or suspicion thereof in the investigator's judgment Presence of concomitant autoimmune inflammatory conditions