“Until now, immunotherapy has not been very successful in treating cancer because tumours are very resistant to immune cells,” said Dr Anna Johansson, from The University of Western Australia, which is affiliated with WAIMR.
“As a cancerous tumour grows, it forms a solid ball which is difficult for immune cells to get into and even if they can penetrate the tumour, the environment inside it either kills the cells or makes it difficult for them to function.
“We engineered a protein called TNF-Alpha so that it went straight to a pancreatic tumour and stayed there without toxic side effects outside the tumour.
“TNF-Alpha affected the blood vessels in the tumour in a surprising way which opened the solid ball so that immune cells could get inside.
“We thought it might damage the blood vessels because TNF-Alpha can be very toxic, but in low doses it actually improved them and increased healthy blood flow, helping immune cells to get inside the cancer.”
TNF-Alpha has been shown to enhance the tumour’s response to chemotherapy but until now scientists did not understand why. This study provides insights on how low-dose TNF-Alpha works in tumour and also shows for the first time that it can be combined with immunotherapy.
- A moving image of tumours surrounded by blood vessels is available as well as still photographs of coloured cells and graphics.
- Interviews with the scientists in the Perth laboratories can be arranged.
Carolyn Monaghan (WAIMR Communications Manager) (+61 4) 48 021 932
Dr Anna Johansson (UWA Centre for Medical Research) (+61 4) 32 337 713
Michael Sinclair-Jones (UWA Public Affairs) (+61 8) 6488 3229 / (+61 4) 00 700 783