Reading cancer's fine print

By Jesse Hawley
Thursday, 06 July, 2017
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Reading cancer's fine print

Seeing tiny blood vessels could be key to finding tumours before they become dangerous. Currently, high-resolution images are taken of the area’s blood vessel structure, but due to technical limitations these images have some of their most vital details stripped away. CSIRO researchers have created an algorithm to model blood vessel growth more accurately.

To grow, cancerous cells feed on a constant supply of nutrients from blood vessels. Like piping infrastructure preceding a new development, the growth of new blood vessels can be mapped to locate early-stage cancers quickly — and with our new algorithm, those maps are finer and more accurate than ever before.

The cells that cling together in tubes and globes, bones and noses to form the cellular mass that is you — they’re each a little bit like a fire. Give them a feed of fuel and oxygen, and they release heat and grow. Remove that feed, either fuel or oxygen, and they die away. This is true for normal and abnormal cells alike. Tumours are abnormal cells unable to control their own growth, are out of control, ‘rogue’, and can manifest into malignant tumours, cancer, which can grow and split, circulating around the body to create ‘spot fire’ metastases.

Tumours, like regular cells, need a constant supply of blood, which carries the nutrients and oxygen needed for the tumour to thrive and divide. If tumours receive no blood supply, they remain a harmless cluster of cells incapable of growing larger than 1 or 2 mm3, or, the size of a sprinkle.

Angiogenesis is the creation of new blood vessels that deliver nutrients and oxygen to the growing tumour, and remove its waste products — the piping infrastructure. Angiogenesis occurs all the time, but tumour growths can kick-start this process around them to fuel their fire. Like screeching baby birds, tumours release various ‘signal proteins’, which tell the body to produce new vessels and blood to shroud the growth in a nutrient feed, helping the cells to grow.

By understanding angiogenesis, and modelling blood vessel growth accurately, researchers can detect nascent tumour growth and stamp it out. In a ‘where there’s smoke, there’s fire’ scenario, where there are newly growing blood vessels, angiogenesis, there may be tumours.

Currently, high-resolution images are taken of the area’s blood vessel structure, but — due to technical limitations — these images have some of their most vital details stripped away: the fine detail of the blood vessel tips, how many of these terminal vessels there are and emphasising vessel volume at the cost of actual geometry.

To ratchet up the quality of this imaging, CSIRO researchers paired up with the Shanghai Institute of Applied Physics, Chinese Academy of Sciences to gather micrometre-scale images of various cancer stages in the brains and livers of mice. Studying these images, the team were able to develop an algorithm that overcame the resolution drawbacks of previous techniques.

The algorithm, when applied to the blood vessel images, works to thin down the structure and — unlike previous methods — retain information on blood vessel length, branching patterns and terminal points.

Like the workings of Precogs from The Minority Report, the revealed intricate tips of new blood vessels portend tumourous growths that can be apprehended before they manifest, increasing the survival outcomes of patients.

“Our robust algorithms for the early detection and quantification of angiogenesis could potentially be a great step forward in the detection and treatment of cancer,” said lead researcher Dr Dadong Wang.

Image caption: (Top left) The hepatic vein of a rat; (top right) The skeleton generated by the ITK 3D thinning method; (bottom left) End points of the terminal vascular branches; (bottom right) The skeleton generated by our method.

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