TUMOR DEVELOPMENT AND GENERALIZATION
What are the characteristics of tumor?
A tumor “is an abnormal mass of tissue, the growth of which exceeds and is uncoordinated with that of the normal tissues, and persists in the same excessive manner after cessation of the stimuli which evoked the change.” Every pathologist can think of exceptions but these do not invalidate the general applicability of …
What is the growth of a tumor?
Doctors call this superficial cancer growth or carcinoma in situ (CIS). The cancer cells grow and divide to create more cells and will eventually form a tumour. A tumour may contain millions of cancer cells. All body tissues have a layer (a membrane) that keeps the cells of that tissue inside.
What are five characteristics of malignant tumors?
The malignant cell is characterized by: acceleration of the cell cycle; genomic alterations; invasive growth; increased cell mobility; chemotaxis; changes in the cellular surface; secretion of lytic factors, etc.
What happens during tumor?
In general, tumors occur when cells divide and grow excessively in the body. Normally, the body controls cell growth and division. New cells are created to replace older ones or to perform new functions. Cells that are damaged or no longer needed die to make room for healthy replacements.
What is the tumor process?
When cells grow old or become damaged, they die, and new cells take their place. Sometimes this orderly process breaks down, and abnormal or damaged cells grow and multiply when they shouldn’t. These cells may form tumors, which are lumps of tissue. Tumors can be cancerous or not cancerous (benign).
What is abnormal cell growth called?
Cancer is the uncontrolled growth of abnormal cells in the body. Cancer develops when the body’s normal control mechanism stops working. Old cells do not die and instead grow out of control, forming new, abnormal cells. These extra cells may form a mass of tissue, called a tumor.
What are the stages of tumor development?
This theory divides cancer development into three stages: initiation, promo- tion, and progression.
Can a tumor grow overnight?
They emerge at night, while we sleep unaware, growing and spreading out as quickly as they can. And they are deadly. In a surprise finding that was recently published in Nature Communications, Weizmann Institute of Science researchers showed that nighttime is the right time for cancer to grow and spread in the body.
What are two features of a malignant tumors?
Thus, characteristics of malignant neoplasms include: More rapid increase in size. Less differentiation (or lack of differentiation, called anaplasia) Tendency to invade surrounding tissues.
What is the difference between a tumor and a mass?
The word tumor simply means a mass. Tumor is therefore a general term that can refer to benign or malignant growths. Benign tumors are non-malignant/non-cancerous tumors. A benign tumor is usually localized, and does not spread to other parts of the body.
What makes a tumor cancerous?
Malignant tumors are cancerous. Our bodies constantly produce new cells to replace old ones. Sometimes, DNA gets damaged in the process, so new cells develop abnormally. Instead of dying off, they continue to multiply faster than the immune system can handle, forming a tumor.