A "malignant growth" refers to an abnormal and harmful mass of cells that can spread and cause damage to nearby tissues or organs in the body. It often refers to cancerous tumors. Full definition
They respond to their environment by progression towards next developmental stages, by evolutionary adaptation, by malignant growth or eventually by death. (cnag.cat)
The reason for their presence and their functional roles in malignant growth remain unclear. (dresden-ipp.de)
However, this risk may not be related to malignant growth of the serrated polyp. (sciencedaily.com)