What permits some cancer cells in a tumor to resist treatment while other cancer cells die from the treatment?

The higher the expression of ATP-binding cassette (ABC) transporter family in a tumor, the more resistant the cancer cells are to chemotherapy. In the tumor tissue, tumor resistance can be connected to the physiology of the tumor tissue, including poor vasculature. These are some of the factors that are responsible for the recurrence of tumors.

b brown mice / white sand dunes

the tricuspid valve is present between right atrium and right ventricle