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How to calculate the dose of chemotherapy Gurney HBr J Cancer 2002[Apr]; 86 (8): 1297-302Body surface area-dosing does not account for the complex processes of cytotoxic drug elimination. This leads to an unpredictable variation in effect. Overdosing is easily recognised but it is possible that unrecognised underdosing is more common and may occur in 30% or more of patients receiving standard regimen. Those patients who are inadvertently underdosed are at risk of a significantly reduced anticancer effect. Using published data, it can be calculated that there is an almost 20% relative reduction in survival for women receiving adjuvant chemotherapy for breast cancer as a result of unrecognised underdosing. Similarly, the cure rate of cisplatin-based chemotherapy for advanced testicular cancer may be reduced by as much as 10%. The inaccuracy of body surface area-dosing is more than an inconvenience and it is important that methods for more accurate dose calculation are determined, based on the known drug elimination processes for cytotoxic chemotherapy. Twelve rules for dose calculation of chemotherapy are given that can be used as a guideline until better dose-calculation methods become available. Consideration should be given to using fixed dose guidelines independent of body surface area and based on drug elimination capability, both as a starting dose and for dose adjustment, which may have accuracy, safety and financial advantages.|Antineoplastic Agents/*administration & dosage/*pharmacokinetics[MESH]|Body Surface Area[MESH]|Dose-Response Relationship, Drug[MESH]|Drug Therapy/*methods/standards/trends[MESH]|Female[MESH]|Humans[MESH]|Male[MESH]|Middle Aged[MESH]|Practice Guidelines as Topic[MESH] |
