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Other agents under investigation in metastatic breast cancer
| Agent | Class of agent | Stage of development |
| Tipifarnib | Farnesyl transferase inhibitor Inhibits Ras activation | II |
| Deforolimus | mTOR inhibitor | II |
| Everolimus | mTOR inhibitor | II |
| Sirolimus | mTOR inhibitor | I |
| Temsirolimus | mTOR inhibitor | Discontinued |
| KU-59436 | PARP inhibitor | II |
| BSI-2011 | PARP inhibitor | II |
| AG-14699 | PARP inhibitor | II |
mTOR, mammalian target of rapamycin; PARP, poly-ADP ribose polymerase.
