Prolonged Dose-Dense Epirubicin and Cyclophosphamide Followed by Paclitaxel in Breast Cancer Is Feasible

Purpose: We conducted a pilot study of dose-dense epirubicin/cyclophosphamide (EC) x 6 -> paclitaxel (P) x 6 with pegfilgrastim. A previous dose-dense trial of FEC (5-fluorouracil [5-FU]/EC) x 6 with filgrastim -> by weekly paclitaxel alternating with docetaxel x 18 was not feasible because of pneumonitis (with dose-dense FEC) and pericardial/pleural effusion (taxane phase). Dose-dense EC (without the 5-FU) is not associated with pneumonitis, and dose-dense paclitaxel (alone) is feasible. Primary objective was feasibility. Patients and Methods: Patients with resectable breast cancer were enrolled, regardless of surgery status, tumor size, or nodal status. Treatment regimen consisted of every-2-week EC (100/600 mg/m(2)) x 6 -> by 2-weekly P (175 mg/m(2)) x 6 with pegfilgrastim 6 mg on day 2. Results: Between November 2004 and May 2005, 38 patients were enrolled. The median age was 47 years (range, 30-72 years); 33 of 38 (87%) were treated in the adjuvant setting and 27 of 33 (81%) had involved nodes (range, 1-46); 5 of 38 (13%) were treated pre-operatively; 33 of 38 (87%) completed all chemotherapy as planned; the remaining patients (13%) had treatment modifications for toxicity. Febrile neutropenia occurred in 6 of 38 patients (16%) and only during EC. There were 12 hospitalizations in 9 of 38 patients (24%) enrolled. Conclusion: Dose-dense every-2-week EC x 6 -> P x 6 with pegfilgrastim is feasible based on our prospective definition.