Formulations and uses of the formulations for treating a malignant mass in a mammal by administering an injectable formulation comprising a therapeutically effective amount of a chemotherapeutic agent dissolved or suspended in a biocompatible carrier directly into the malignant mass are disclosed. In certain preferred embodiments, the injectable formulation is a taxane (e.g. paclitaxel), a podophyllotoxin derivative (e.g., etoposide), or a camptothecin derivative (e.g., hydroxycamptothecin).
