Mathematicians Model Growth of Tumor

To understand tumor growth, a group of mathematicians from the University of California Irvine applied a model based on a mathematical technique called optimal control theory, and got some interesting results:

UCI mathematicians Natalia Komarova, Alexander Sadovsky and Frederic Wan looked at cancer from the point of view of a tumor and asked: What can a tumor do to optimize its own growth? They focused on the phenomenon of genetic instability, a common feature of cancer in which cells mutate at an abnormally fast rate. These mutations can cause cancer cells to grow, or they can cause the cells to die.
The scientists found that cancerous tumors grow best when they are very unstable in early stages of development and become stable in later stages. In other words, tumors thrive when cancerous cells mutate to speed up malignant transformation, and then stay that way by turning off the mutation rate.
The study appeared this week in the Royal Society journal Interface…
Previous studies have observed this genetic pattern by using laboratory techniques, but the UCI research is the first to explain why the pattern leads to tumor growth. The occurrence of genetic instability is often debated by cancer scientists, some of whom believe that cancer feeds on this instability and others who believe it is a side-effect of the cancer itself.
To determine the pattern of genetic changes that leads to the most robust tumor growth, Komarova and her colleagues used a mathematical technique called optimal control theory in which they considered a tumor with set characteristics, then changed the cell mutation variable to see under which circumstances the tumor grew best.
“The mutation rate serves as the control knob. Then, we can calculate mathematically how long it takes a tumor with given parameters to reach a certain size,” Komarova said. “We found that at early stages of tumor growth, instability is advantageous, and later on it becomes an impediment. This explains why many tumors exhibit a high level of instability at first, and become stable later in their development.”

Press release: Mathematics reveals genetic pattern of tumor growth …