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Richardson, P.G. et al.

Paul G. Richardson, Ashraf Z. Badros, Sundar Jagannath, Stefano Tarantolo, Jeffrey L. Wolf, Maher Albitar, David Berman, Marianne Messina, Kenneth C. Anderson,

Tanespimycin with bortezomib: activity in relapsed/refractory patients with multiple myeloma.

Tanespimycin (17-allylamino-17-demethoxygeldanamycin, 17-AAG) disrupts heat shock protein 90 (HSP90), a key molecular chaperone for signal transduction proteins critical to myeloma growth, survival and drug resistance. In previous studies, tanespimycin monotherapy was well tolerated and active in heavily pretreated patients with relapsed/refractory multiple myeloma (MM). Preclinical data have shown antitumour synergy between tanespimycin and bortezomib, with more pronounced intracellular accumulation of ubiquitinated proteins than either drug alone, an effect attributed to the synergistic suppression of chymotryptic activity in the 20S proteasome. HSP70 induction has been observed in all Phase 1 tanespimycin studies in which it has been measured, with several separate reports of HSP70 overexpression protecting against peripheral nerve injury. In this Phase 2, open-label multicentre study, we compared 1.3 mg/m2 bortezomib + three doses of tanespimycin: 50, 175 and 340 mg/m2 in heavily pretreated patients with relapsed and refractory MM and measured HSP70 expression and proteasome activity levels in plasma of treated patients. The study was closed prematurely for resource-based reasons, precluding dose comparison. Nonetheless, antitumour activity was observed, with promising response rates and promising severity of peripheral neuropathy.[1]

References

Tanespimycin with bortezomib: activity in relapsed/refractory patients with multiple myeloma. Richardson, P.G., Badros, A.Z., Jagannath, S., Tarantolo, S., Wolf, J.L., Albitar, M., Berman, D., Messina, M., Anderson, K.C. Br. J. Haematol. (2010) [Pubmed]

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