Safety and Efficacy Trial Using Allogeneic Human Mesenchymal Stem Cells: The SIRONA Trial

This is a phase 2b, randomized, placebo-controlled clinical trial designed to evaluate the safety and efficacy of Longeveron Mesenchymal Stem Cells (LMSCs) in subjects with metabolic syndrome and to assess the effects of LMSCs on endothelial function using several different doses.

This is a randomized, placebo-controlled clinical trial designed to evaluate the safety and efficacy of Longeveron Mesenchymal Stem Cells (LMSCs) in subjects with metabolic syndrome and to assess the effects of LMSCs on endothelial function using several different doses. Following a successful run-in phase, a total of forty (40) subjects will be randomized (1:1:1:1) to receive one of three different doses of LMSCs or placebo. After randomization, baseline imaging, testing and study product infusion, subjects will be followed up at 24 hours, month 1, month 3, month 6, month 9 and month 12 post study product infusion. All endpoints will be assessed at the 3, 6 and 12 month visits which will occur 90±30 days, 180±30 days, and 365±30 days respectively from the day of the study product infusion (Day 1). For the purposes of the endpoint analysis and safety evaluations, an "intent-to-treat" study population will be utilized.

Eligibility Criteria:
Inclusion Criteria:

* Each subject must provide written informed consent.
* Each subject must be ≥45 and ≤ 85 years of age at the time of signing the Informed Consent Form.
* Each subject must have endothelial dysfunction.
* At the time of enrollment, each subject must meet at least 3 out of the 5 criteria under the harmonized definition of the metabolic syndrome, consisting of the following

  * Hypertension.
  * Elevated triglycerides.
  * Reduced high-density lipoprotein (HDL) levels.
  * Elevated fasting glucose. --Central obesity.

Exclusion Criteria:

* Be unable and/or unwilling to perform any of the assessments required for endpoint analysis.
* Have diabetic retinopathy.
* Sitting or resting systolic blood pressure \>180 mm Hg or diastolic blood pressure \>110 mm Hg at Screening.
* Have a resting blood oxygen saturation of \<93% (measured by pulse oximetry).
* Be hypersensitive to dimethyl sulfoxide (DMSO).
* Have a history of alcohol or drug abuse within the past 24 months.
* Have been diagnosed with malignancy within the past 5 years, with the exception of curatively-treated basal cell carcinoma, melanoma in situ or cervical carcinoma.
* Be an organ transplant recipient.
* Be actively listed (or expected to be listed) for transplant of any organ.
* Have a condition that limits life expectancy to \< 1 year.
* Be serum positive for HIV, hepatitis B sAG or viremic hepatitis C.
* Be a female who is pregnant, nursing, or of childbearing potential while not practicing effective contraception (female patients must undergo a blood or urine pregnancy test at screening and within 36 hours prior to injection).
* Have any serious comorbid illness or other condition that, in the opinion of the Investigator, may compromise the safety or compliance of the subject or preclude successful completion of the study.
* Be currently participating in an investigational therapeutic or device trial.
* Be currently participating in an investigational therapeutic or device trial, or have participated in an investigational therapeutic or device trial within the previous 30 days, or participate in any other clinical trial for the duration of the time that he or she is actively participating in this trial.