Summary
The frequency of both neurologic toxicity and therapeutic response due to intra-arterial (IA) chemotherapy is decreased by dose reduction. A method to individualize IA drug dosage is needed to provide each patient with the safest, most effective dose. Most trials of IA chemotherapy for malignant glioma have used body surface area (BSA) to calculate dosage; but brain size and arterial distribution do not correlate well with BSA. Fixed doses of cisplatin and BCNU were used in combination to perform 35 IA infusions in 20 malignant gliomas patients. Doses modified by the number of major intracranial vessels supplied by the infused artery were used in 34 infusions in 19 patients. Patients receiving 150 to 200 mg CP and 300 mg BCNU had an incidence of neurologic deficit of 5.6% if ≥ 3 vessels were supplied by the infused artery compared to 42% for those with only 2 vessels. This crude dose modification maintained efficacy while reducing neurologic toxicity. Further refinement is possible using well established intra-arterial pharmacokinetic principles. Intra-arterial dosing based on volume flow at the site of infusion would yield a more reproducible exposure of the infused capillary bed to a drug than methods currently in use. More consistent drug exposure should reduce toxicity due to over dosing and treatment failure due to under dosing.
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Bobo, H., Kapp, J.P. & Vance, R. Effect of intra-arterial cisplatin and 1,3-bis(2chloroethyl)-1-nitrosourea (BCNU) dosage on radiographic response and regional toxicity in malignant glioma patients: proposal of a new method of intra-arterial dosage calculation. J Neuro-Oncol 13, 291–299 (1992). https://doi.org/10.1007/BF00172483
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DOI: https://doi.org/10.1007/BF00172483