Question

time Carcinoma in situ

Answer 1

Carcinoma in situ is comprised of a group of abnormal cells forming a neoplasm. There is a debate over whether CIS should be categorized as cancer. The term "pre-cancer" is often used for them. Since these abnormal cells grow in their place, thus it is termed "in situ" (as in Latin "in situ" means "in its place"). However, later these abnormal cells may become invasive and spread into nearby normal tissues. This stage is called stage 0 of the disease.