![](https://webarchive.library.unt.edu/eot2008/20090514071112im_/http://www.cancer.gov/images/spacer.gif) |
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(SIH-lih-KON THAH-loh-SY-uh-NEEN)
![](https://webarchive.library.unt.edu/eot2008/20090514071112im_/http://www.cancer.gov/images/spacer.gif)
| A substance being studied in the treatment of cancer. When absorbed by cancer cells and exposed to light, it becomes active and kills the cancer cells. It is a type of photodynamic therapy agent. |
Previous Definitions: | signature molecule, signet ring cell carcinoma, significant, SIL, sildenafil | Next Definitions: | silicone, Silybum marianum, silymarin, simian virus 40, simple mastectomy |
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