Evaluating the impact of relative total dose intensity (RTDI) on patient's short- and long-term outcome in taxane- and anthracycline-based chemotherapy of metastatic breast cancer: A pooled analysis

1065 Background: The consequences of reducing chemotherapy dose intensity might be extensive, potentially affecting short- and long-term outcomes as well as patient quality of life, the dose and schedule are of central concern in the delivery of chemotherapy. Methods: This statistical analysis was based on individual subject data of 934 patients (pts) obtained from the following prospective, open-label, randomised phase III trials in metastatic breast cancer that recruited between 1996 and 2005 investigating an anthracycline/taxane based first-line chemotherapy: CECOG trial, AGO-Mamma-1 and AGO-Mamma-3 trial. The primary objective of the analysis was to evaluate the influence of RTDI on progression free survival (PFS) in different predefined binary RTDI cuts from 75% to 95% with an interval at every 5%. Relative total dose intensity (RTDI) is the ratio of actual total dose intensity and planned total dose intensity, expressed as a percentage. RTDI quantifies dose reductions and delays, as well as prematur...