Tissue cultures (samples of cancer cells) are taken from cancer patients, and the cells are then grown in a laboratory. what is the purpose of growing cancer cells in a laboratory?

For observation and research. This is to analyse their features, structures, physiology and other possible mutations -genetic structures that have caused it to arrive at this rate.

Cancer cells are the result of those cells that deviate from the normal life cycle of a cell. These cancer cells refuse to die and rapidly increase in number due to the uncontrollable burst of cell division.

It is used to during sexual reproduction between humans