platinum
Meaning of platinum: One element with two unrelated medical jobs: the core of a chemotherapy family, and a corrosion proof metal inside implanted devices.
Definition of platinum
Platinum is a dense metallic element that resists corrosion and reacts with very little, which makes it useful inside the body in two separate ways. Compounds built around a platinum atom form a major family of chemotherapy drugs, and the metal itself is used in implanted devices, where it can stay in contact with tissue for years without breaking down.
How do platinum chemotherapy drugs work?
Once inside a cell, the platinum atom binds directly to DNA and links neighboring bases together. The strands can no longer be pulled apart and copied, and a cell that cannot copy its DNA cannot divide. Damage of that kind normally triggers the cell's own self destruct pathway. Because the effect depends on division, tissues that renew quickly are hit alongside the tumor, which explains the pattern of effects on bone marrow, the gut lining and hair. Platinum drugs are rarely used alone; they anchor combinations built with other agents, and they are among the most widely used forms of chemotherapy.
How do the platinum drugs differ from one another?
| Drug | Often used against | Characteristic drawback |
|---|---|---|
| Cisplatin | Testicular, bladder, head and neck, lung | Kidney injury, hearing loss, severe nausea |
| Carboplatin | Ovarian and lung cancers | Gentler on kidneys and nerves, harder on bone marrow |
| Oxaliplatin | Colorectal cancer | Nerve symptoms in the hands and feet, often triggered by cold |
All three carry the same platinum center. What differs is the chemical scaffolding attached to it, and that scaffolding governs how fast the drug reacts, how it is cleared, and which tissues bear the cost.
Where else is platinum used in medicine?
The properties that make platinum useful as a drug are unrelated to those that make it useful as a material. As a metal it does not corrode, provokes little reaction from surrounding tissue, and conducts electricity well, so it appears in pacemaker and neurostimulator electrodes, usually alloyed with iridium for strength. It is also dense enough to show clearly on x-ray, which is why platinum marker bands are placed on stents and catheters and why platinum coils are used to seal off abnormal blood vessels. In none of these roles does the metal behave like the drug: it is chosen precisely because it stays put and reacts with nothing, as does the element in its pure form.
Used in a sentence
The chemotherapy regimen included a platinum based drug in combination with a second agent.
Good to know
Platinum chemotherapy names a drug family built on the metal, a completely separate use from platinum as an inert material in implanted devices, and the same element name covers both.