👉 In medical terminology, "preexpression" refers to a process in which a cell or tissue produces its own transcription factor, known as an enhancer. This is typically not seen in normal cells and is only found in cancerous tissues where it serves as an oncogene. It's important to note that preexpressions are not always positive signals for cancer development, but rather they can be used by cancer cells to activate their own genes or alter the expression of existing genes. In some cases, pre
