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. 1999 Apr;80(1-2):175–184. doi: 10.1038/sj.bjc.6690337

Radioimmunotherapy of micrometastases in lung with vascular targeted213Bi

S J Kennel 1, R Boll 1, M Stabin 2, H M Schuller 3, S Mirzadeh 1
PMCID: PMC2362995  PMID: 10389994

Abstract

A model system has been used to test the efficacy of vascular targeting of α-particle emitter213Bi for therapy of small, ‘artificial’ metastases in mouse lung. Specific monoclonal antibody (mAb) 201B was used to deliver greater than 30% of the injected dose to lung where tumours had developed due to intravenous injection of cells. Specific213Bi-mAb 201B treatment of BALB/c mammary carcinoma EMT-6 tumours in lung resulted in a dose-dependent destruction of tumours and an extended lifespan of treated animals relative to controls. Significant reduction of lung tumour burden was noted in animals treated with 0.93 MBq injected dose or as little as 14 Gy absorbed dose to the lung. Animals treated with higher doses (2.6–6.7 MBq) had nearly complete cure of lung tumours but eventually died of lung fibrosis induced by the treatment. Four other tumour cell types were studied: murine Line 1 lung carcinomas in syngeneic BALB/c mice, rat IC-12 tracheal carcinoma growing in severe combined immune deficient (SCID) mice, and two human tumours – epidermoid carcinoma A431 and lung carcinoma A549 – growing in SCID mice. In all cases, the number of lung tumour colonies was reduced in animals treated with specific, labelled mAb relative to those in animals treated with control213Bi MAb or EDTA complexed213Bi. Tumours treated in immunodeficient SCID mice were partially destroyed or at least retarded in growth, but ultimately regrew and proved fatal, indicating that an intact immune function is necessary for complete cure. The data show that the short-lived α-particle emitter213Bi can be effectively targeted to lung blood vessels and that tumour cells growing in the lung are killed. The mechanism may involve direct killing of tumour cells from α-particle irradiation, killing through destruction of blood supply to the tumour, or a combination of the two. © 1999 Cancer Research Campaign

Keywords: vascular targeting, α-particle emitter, 213Bi, therapy

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Selected References

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