→Cancer cells appear to have lost this property. As a result of this, cancerous cells just continue to divide giving rise to masses of cells called tumors.
→There are two types of tumors:
→Benign tumours:
→Confined to the place of its origin. They do not spread to other parts. Cause little damage,
→Malignant tumours:
→Mass of proliferating cells (neoplastic or tumour cells) that grow rapidly, invade and damage the surrounding normal tissues. Due to active division and growth, they starve normal cells by competing for nutrients.
→Cells sloughed from tumours reach other sites via blood where they form a new tumour. This is called metastasis.