[gdpawel]

Platinum-based drugs are effective against cancer because at their centre is a platinum atom joined to two ammonion molecules and two chloride ions. The compound is negatively charged, but when it enters the cancer cell it becomes positively charged because the chloride ions are replaced by water molecules.

The water molecules are easily displaced, allowing the platinum-based compound to attach to DNA in the cancer cell: it forms cross-links in the DNA that block the cell's ability to read the code, which is essential for cell function. If enough of the DNA is unreadable, the cell dies.

Platinum-based chemotherapy drugs are among the most powerful and widely used against cancer. However, they have toxic side effects, and tumors can become resistant to them.

When faced with a platinum drug, some cancer cells are able to establish defenses and develop resistance to the drug. The cells contain sulfur compounds such as glutathione that attack the platinum and destroy it before it can reach and bind to DNA.

Massachusetts Institute of Technology