(A) Proportions of patients with early-stage breast cancer younger than age 65 years (blue) and older than age 65 years (gold) hospitalized for chemotherapy-related reasons (neutropenia, fever, infection, thrombocytopenia, anemia, adverse effects of chemotherapy, dehydration, delirium) per chemotherapy regimen. (B) Hospitalization rates adjusted for granulocyte colony-stimulating factor primary prophylaxis. A, doxorubicin; C, cyclophosphamide; dd, dose dense; P, paclitaxel; T, docetaxel; w, weekly.