Arm I: Patients receive adjuvant gemcitabine hydrochloride IV over 70-90 minutes on days 1 and 8 and docetaxel IV over 30-60 minutes on day 8. Patients also receive filgrastim subcutaneously (SC) on days 9-15 or pegfilgrastim SC on day 9 or 10. Treatment repeats every 21 days for up to 4 courses in the absence of disease progression or unacceptable toxicity. Patients then undergo computed tomography (CT) and/or magnetic resonance imaging (MRI). Patients with no evidence of disease receive doxorubicin hydrochloride IV every 21 days for 4 courses in the absence of disease progression or unacceptable toxicity. Patients also receive filgrastim SC on days 2-8 or pegfilgrastim SC on day 2 or 3.