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PLX Cells Significantly Inhibit Cancer Cell Growth

Published on 12th January

A peer-reviewed article in the journal Scientific Reports, published by Nature, confirms that  PLX cells (PLacental eXpanded; Pluristem Therapeutics) exhibit an anti-proliferative effect on a wide range of human cancer cell types.  The conclusion is based on a pre-clinical study which shows statistically significant reduction in tumor size as well as complete tumor remission in 30% of treated patients.[1]

The article is based on studies which examined the effect of PLX cells that had been induced with tumor necrosis factor alpha (TNF-α) and interferon-gamma ( IFN-γ), on the proliferation of over 50 lines of human cancerous cells. The induction of the cells was carried out by adjusting their manufacturing process in order to transiently alter their secretion profile.


… these findings show promise for the use of PLX cells in slowing and reversing the growth of cancer cells …. particularly for some cancers that don’t have viable treatment options…


Data from the first study showed that the modified PLX cells exhibited an anti-proliferative effect on 45% of the tested cancer cell lines, with a strong inhibitory effect on various lines of breast, colorectal, kidney, liver, lung, muscle and skin cancers. Comprehensive bioinformatics analysis identified common characteristics of the cancer cell lines inhibited by PLX cells. This knowledge could potentially be used in the future for screening patients’ tumors to identify those patients most likely to show a positive response to treatment with PLX cells.

Based on these promising results, Pluristem Therapeutics, a developer of placenta-based cell therapy products, conducted a pre-clinical study of female mice harboring human triple negative breast cancer (TNBC).

TNBC is an aggressive form of breast cancer that does not respond to standard hormonal therapy due to a lack of estrogen and progesterone receptors. Current treatment for TNBC consists of a combination of surgery, radiation therapy, and chemotherapy, and yet the prognosis remains poor for patients with this type of breast cancer. This represents a major unmet medical need.

In this study, weekly intramuscular (IM) injections of the induced PLX cells produced a statistically significant reduction (p= 0.025) in mean tumor size in the treated group compared with the untreated group, with 30% of the treated mice exhibiting complete tumor remission.

In addition, a statistically significant reduction (p=0.003) was seen in the percentage of proliferating tumor cells as well as in the level of blood vessels within the tumors.

“The findings of this study published in a peer-reviewed journal are the outcome of over two years of research as well as the vast knowledge of PLX cell properties we have developed over the last 10 years. We believe the findings show promise for the utilization of our induced PLX cells in slowing and reversing the growth of cancer cells, particularly for some cancers that don’t have viable treatment options,” stated Zami Aberman, Chairman and Co-CEO of Pluristem.

“The findings also confirm the effectiveness of IM administration and support a mechanism of action involving immunomodulation and inhibition of angiogenesis and cell proliferation in cancerous conditions,” Aberman added.

“Our unique patented manufacturing platform allows us to alter our cells’ secretion profile in correlation with the targeted cancer cells, which may open new possibilities in the field of oncology to treat solid tumors and may also offer new paths to help millions of patients around the world. As in immunotherapy technology, PLX cells potentially have the ability to communicate with the body and to secrete biological components that enhance regeneration processes and support the body in fighting cancer cells,” he explained.

Pluristem has filed patent applications relating to the technology for the induction of PLX cells and the use of these cells for the treatment of cancer.


Last Editorial Review: January 12, 2018

Featured Image: Medical/science laboratory test tubes Courtesy: © 2010 – 2017 Fotolia. Used with permission

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