Question

Cancer cells have lost the property of contact inhibition.
Why_____?

Answer 1

When noncancerous cells come into contact with each other, contact inhibition allows them to stop proliferating and growing. When cells undergo malignant transformation, this feature is lost, resulting in uncontrolled proliferation and the development of solid tumours.

Complete solution:
When cells reach larger densities, contact inhibition is an important anticancer strategy that stops cell proliferation.
When cells come into contact with each other, contact inhibition stops them from growing. As a result, normal cells cease to proliferate. In cancer cells, contact inhibition is eliminated. Cancer cells do not stop growing; instead, they multiply and pile up on top of one another, producing multilayered foci. Membrane proteins indicate growth arrest, which is mediated by increased amounts of the cyclin-dependent kinase inhibitor p27Kip1. In the G1 phase of the cell cycle, this mechanism stops the cells from growing.
Normal cells have a characteristic known as 'contact inhibition.' When they come into touch with other cells, it inhibits them from proliferating uncontrollably. Cancerous cells, on the other hand, appear to have lost this characteristic and continue to divide while being in touch with other cells, resulting in tumours. Metastasis is a characteristic of malignant tumours that allows them to spread to other organs or sections of the body by quickly growing, invading surrounding tissues, and reaching distant places through blood and lymph.
Cancer is one of the most feared diseases because of these two characteristics.

Note:
In normal cells, a set of genes known as oncogenes or proto-oncogenes may cause cancer.
These genes exist in an inactive or repressed state. Some stimuli, such as physical, chemical, or biological carcinogens, have the ability to activate these oncogenes, causing normal cells to become malignant.
CT (Computed Tomography) and MR1 (Magnetic Resonance Imaging) are two methods for identifying malignancies of the internal organs.