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New ways to treat solid tumors
Date:8/15/2014

An international team of scientists has shown that an antibody against the protein EphA3, found in the micro-environment of solid cancers, has anti-tumour effects.

As EphA3 is present in normal organs only during embryonic development but is expressed in blood cancers and in solid tumours, this antibody-based approach may be a suitable candidate treatment for solid tumours.

The researchers from Monash University and Ludwig Cancer Research, in Australia, and KaloBios Pharmaceuticals, in the US, have had their findings published in the journal Cancer Research.

The team, led jointly by the late Professor Martin Lackmann, from the School of Biomedical Sciences at Monash; and Professor Andrew Scott, from Ludwig Cancer Research, has found that even if tumour cells do not have this molecule they can thrive by recruiting and taking advantage of supporting EphA3-containing cells in the tumour micro-environment.

First author, Dr Mary Vail, Monash Department of Biochemistry and Molecular Biology said: "The tumour cells send out signals to the surrounding area and say: 'We need a blood supply and a foundation upon which to spread'."

"We have shown that EphA3 expressing stromal stem cells, which are produced by the bone marrow, form cells that support and create blood vessels in tumours," Dr Vail said.

Professor Andrew Scott's team at Ludwig introduced human prostate cancer cells into a mouse model to mimic disease progression in humans. EphA3 was found in stromal cells and blood vessels surrounding the tumour.

They also observed that treatment with an antibody against EphA3 (chIIIA4) significantly slowed tumour growth. The antibody damaged tumour blood vessels and disrupted the stromal micro-environment, and cancer cells died because their 'life-support' was compromised.

"In addition, we screened various tumours from patient biopsies - sarcomas, melanomas as well as prostate, colon, brea
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Contact: Rachael Fergusson
rachael.fergusson@monash.edu
61-399-034-841
Monash University
Source:Eurekalert

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