Pluristem stem cell trial to treat muscle injury meets main goal | Reuters


Pluristem’s placental PLX-PAD cells produced show statistically significant improvement over placebo in the change of the maximal contraction force of the gluteal muscle

Pluristem Therapeutics Inc., a leading developer of placenta-based cell therapies, has announced results from its Phase I/II clinical trial that examines the safety and efficacy of PLacental eXpanded (PLX-PAD) cells in the treatment of muscle injury.  This trial showed patients treated with PLX-PAD had a greater improved change of maximal voluntary muscle contraction force than the placebo group.  These results show that PLX cells may have the ability to improve muscle and tendon healing after orthopedic injuries.

This Phase I/II trial was a randomized, placebo-controlled, double-blinded study conducted at the Orthopedic Clinic of the Charité University Medical School under the oversight of the Paul-Ehrlich-Institute (PEI), Germany’s health authority.  The injured muscle studied was the gluteus medius muscle in the buttock. Total hip replacement surgery via the standard transgluteal approach necessitates injury of the gluteus medius muscle, and post-operative healing is crucial for joint stability and function.

The 20 patients in the study were randomized into three treatment groups. Each patient received an injection in the traumatized gluteal muscle that had been injured during hip replacement surgery.  One group was treated with 150 million PLX-PAD cells per dose (n=7), the second was administered 300 million PLX-PAD cells per dose (n=6), and the third received placebo (n=7).

The primary safety endpoint was clearly met, since patients showed no serious adverse events reported at either dose level.  In this study, PLX-PAD cells were safe and well tolerated.

The primary efficacy endpoint of the study was the change in maximal voluntary isometric contraction force of the gluteal muscle at six months after the surgery.  Efficacy was shown in both PLX-PAD treated patient groups, but the patients in the group who had received the 150 million cell dose displayed a statistically significant 500% improvement over the placebo group in the change of the maximal contraction force of the gluteal muscle (p=0.0067).   Patients treated at the 300 million cell dose showed a 300% improvement over the placebo (p=0.18).

The structure of the gluteal muscle was also evaluated by means of magnetic resonance imaging (MRI).  MRI analysis revealed an increase in muscle volume in those patients treated with PLX-PAD cells versus the placebo group.  This efficacy endpoint was demonstrated in both PLX-PAD treated patient groups, with the group receiving the 150 million cell dose displaying a statistically significant superiority over the placebo group.  Patients treated at the 150 million cell dose showed an approximate 300% improvement over the placebo in the analysis of muscle volume (p=0.004).  Patients treated at the 300 million cell dose showed an approximate 150% improvement over the placebo in the change of muscle volume (p=0.19).  The complete dataset that includes biopsy results and functional assessments and will be presented at a medical conferences in the future.

The study’s Senior Scientist, Dr. Tobias Winkler of the Center for Musculoskeletal Surgery, Julius Wolff Institute Berlin, Charité – Universitaetsmedizin Berlin, Germany, commented, “I am very impressed with the magnitude of the efficacy results seen in this trial. PLX cells demonstrated safety and suggested that the increase in muscle volume could be a mechanism for the improvement of contraction force.”

Zami Aberman Chairman and CEO stated, “This was a very important study not only for Pluristem but for the cell therapy industry in general. The study confirms our pre-clinical findings that PLX-PAD cell therapy can be effective in treating muscle injury. Having a statistically significant result for our primary efficacy endpoint is very encouraging and consistent with our understanding of the mechanism of action associated with cell therapy. Based on these results, we intend to move forward with implementing our strategy towards using PLX cells in orthopedic indications and muscle trauma.”

The Stem Cell Blog

  • cells were safe and well tolerated
  • one group receiving a 150 million cell dose displaying a 500 percent improvement over the placebo group.
  • Patients treated with a 300 million cell dose showed a 300 percent improvement over the placebo.
  • An analysis of the gluteal muscle indicated an increase in muscle volume in those patients treated…versus the placebo group.

Pluristem stem cell trial to treat muscle injury meets main goal

TEL AVIV Tue Jan 21, 2014 3:07am EST

(Reuters) – Pluristem Therapeutics Inc said results from its early/mid-stage clinical trial indicated its placenta-derived stem cells for the treatment of muscle injury were safe and provided evidence the cells might be effective in treating orthopedic injuries.

\”Patients treated with PLX-PAD had a greater improved change of maximal voluntary muscle contraction force than the placebo group,\” Israel-based Pluristem said in a statement on Tuesday.

The trial was conducted at the Orthopedic Clinic of…

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mburatov

Professor of Biochemistry at Spring Arbor University (SAU) in Spring Arbor, MI. Have been at SAU since 1999. Author of The Stem Cell Epistles. Before that I was a postdoctoral research fellow at the University of Pennsylvania in Philadelphia, PA (1997-1999), and Sussex University, Falmer, UK (1994-1997). I studied Cell and Developmental Biology at UC Irvine (PhD 1994), and Microbiology at UC Davis (MA 1986, BS 1984).