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Itokazu M, Esaki M, Yamamoto K, et al. Local drug delivery system using ceramics: vacuum method for impregnating a chemotherapeutic agent into a porous hydroxyapatite block. J Mater Sci Mater Med. 1999;10(4):249-52doi: 10.1023/a:1008966314075.
Itokazu, M., Esaki, M., Yamamoto, K., Tanemori, T., & Kasai, T. (1999). Local drug delivery system using ceramics: vacuum method for impregnating a chemotherapeutic agent into a porous hydroxyapatite block. Journal of materials science. Materials in medicine, 10(4), 249-52. https://doi.org/10.1023/a:1008966314075
Itokazu, M, et al. "Local drug delivery system using ceramics: vacuum method for impregnating a chemotherapeutic agent into a porous hydroxyapatite block." Journal of materials science. Materials in medicine vol. 10,4 (1999): 249-52. doi: https://doi.org/10.1023/a:1008966314075
Itokazu M, Esaki M, Yamamoto K, Tanemori T, Kasai T. Local drug delivery system using ceramics: vacuum method for impregnating a chemotherapeutic agent into a porous hydroxyapatite block. J Mater Sci Mater Med. 1999 Apr;10(4):249-52. doi: 10.1023/a:1008966314075. PMID: 15348159.
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J Mater Sci Mater Med. 1999 Apr;10(4):249-52. doi: 10.1023/a:1008966314075.

Local drug delivery system using ceramics: vacuum method for impregnating a chemotherapeutic agent into a porous hydroxyapatite block.

Journal of materials science. Materials in medicine

M Itokazu, M Esaki, K Yamamoto, T Tanemori, T Kasai

Affiliations

  1. Department of Orthopaedic Surgery, Gifu University School of Medicine, Gifu, 500-8705, Japan. [email protected]

PMID: 15348159 DOI: 10.1023/a:1008966314075

Abstract

We performed an experimental study on a new drug delivery system that employs a porous hydroxyapatite block (HAb) (composition: Ca10(PO4)6(OH)2)) to conduct sustained release of a chemotherapeutic agent. To confirm penetration of the agent into the HAb (2 cm3), an aqueous solution containing eosin dye was used at various vacuum pressures. To estimate the storage capacity of the HAb, blocks were weighed before and after being impregnated with the aqueous dye solutions, and the capacity of the block was calculated from the increase in weight after vacuum. In this slow-release study using vacuum, the anti-cancer drug methotrexate (MTX) was used in vitro. Four HAb (1 cm3) containing different concentrations of MTX, ranging from 1.22 to 2.38 mg per block, were studied. All were found to release the drug, maintaining a mean concentration of 0.22 to 0.32 microg/ml even after twelve days. This concentration is high enough to be effective against tumor cells. The results suggest that HAb impregnated with a chemotherapeutic agent using a simple vacuum system may serve as a valuable new method of administering local chemotherapy, primarily when used as a strut graft for bone defects. This new drug delivery system can also be used as an adjuvant material in extended curettage, which can also discourage recurrence of benign tumors without any risk of systemic toxicity.

Copyright 1999 Kluwer Academic Publishers

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