Improved mehtods and reagents for pretargeted radioimmunotherapy of cancer

Pretargeted radioimmunotherapy (PRIT) of cancer improves upon conventional radioimmunotherapy (RIT) by decoupling the pharmacokinetics of the targeting agent and the radioisotope. In order to improve upon PRIT, we have considered variables such as treatment setting and methodology, the transport and clearance characteristics of targeting agents, and the radionuclides used for therapy. PRIT has been modeled with the aim of examining the theoretical potential of PRIT under optimal conditions to kill every cell in malignant, avascular micrometastases. A mathematical model of PRIT was developed that combined a two-compartment pharmacokinetic model, antibody binding kinetics, diffusion and catabolism in tumor spheroids, and radiation dosimetry models for alpha- and beta-emitting radionuclides. This model demonstrated that it is theoretically possible to kill every cell in 100 tm radius micrometastases using 9Y- or 213Bi-based PRIT with acceptable toxicity as described. The therapeutic window for dosing radionuclide-carrying hapten was found to be strongly dependent on cell-specific parameters such as antigen concentration, void fraction, and the radiosensitivity parameter a, as well as on targeting agent molecular parameters such as the diffusivity and antigen-binding association rate.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Chemical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2007

Author dc:creator

• Zajic, Stefan C

Advisor dc:contributor.advisor

• K. Dane Wittrup.

• Chemical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/38971

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/38971