Dose rounding of chemotherapy in colorectal cancer: An analysis of clinician attitudes and the potential impact on treatment costs

Aim: The aims of this study were to calculate theoretical cost savings of oxaliplatin dose rounding in colorectal cancer (CRC), and to assess clinician attitudes to chemotherapy dose rounding. Methods: Data were obtained from a prospective data repository (BioGrid Australia) from four hospitals regarding the use of oxaliplatin, given at a standard dose of 85 mg/m2. We examined potential cost savings for patients with a body surface area (BSA) between 1.77 m2 and 1.94 m2, resulting in a calculated dose up to 10% above 150 mg (a 100 mg and 50 mg vial). The attitudes of oncologists at these hospitals toward minor dose reductions were assessed. Results: From January 2003 to June 2008, of 676 patients with Stages III or IV CRC, 227 (33.58%) received oxaliplatin. Overall 66 patients (29%) had a calculated BSA between 1.77 m2 and 1.94 m2. The potential cost saving for these hospitals in one year, if oxaliplatin doses were rounded down to 150 mg, is $AU51 898. Extrapolated to the Australian population, estimated savings are over $AU2.5 million per year. Three of nine (33.3%) oncologists were comfortable with an initial dose reduction of up to 10% in the adjuvant disease setting, and seven of nine (77.8%) in the setting of metastatic disease. Conclusion: Minor dose reductions for CRC to accommodate vial sizes would lead to significant cost savings. Oncologists are more comfortable with minor dose reductions when treatment is given in a palliative setting.