ABCC1, also known as ATP-binding cassette sub-family C member 1, is a protein that plays a crucial role in transporting various molecules across cellular membranes. It is part of the larger ATP-binding cassette (ABC) transporter family, which is involved in the movement of substances like lipids, drugs, and toxins in and out of cells. This protein is particularly important in the context of drug resistance, as it can help cells expel certain medications, making it a focus of research in cancer treatment. Understanding ABCC1's function can provide insights into how to overcome resistance and improve the effectiveness of therapies.