noninvasive tumour

A noninvasive tumor is a growth that remains localized to its original site and does not spread into surrounding tissues. This is in contrast to malignant tumors, which invade and destroy healthy tissues and can metastasize to distant parts of the body.1234

Noninvasive tumors, also known as "in situ" tumors, are in the earliest stage where cancer is recognized. They lack their own blood vessels for nutrients and oxygen and have not yet entered the circulatory system to form new tumors. Often, these tumors are asymptomatic, which is unfortunate because they are curable at this stage.1

While benign tumors are also localized, noninvasive tumors specifically refer to cancerous growths that have not yet breached their original boundaries.31