Answer:
Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.
The most famous cancer cells are called HeLa cells. They're named HeLa cells after the young woman whose cervical cancer cells were biopsied to create this immortal line of cells: Henrietta Lacks. Her cells are still used to today in cancer research.
Side note: Her cells were used WITHOUT her consent and without any type of compensation for her contribution. Her case has been a big source of debate in the biomedical ethics community about consent and racial disparities in healthcare.
It is called Aminio Acid.