Provided herein are methods for treating subjects having a cancer, such as a relapsed or refractory solid tumor, wherein the method comprises administering to the subject a cytidine analog. In certain of the methods, the cytidine analog is administered alone or in combination with one or more anti-cancer agents. Also provided are methods for using a cytidine analog, to treat diseases and disorders including disorders related to abnormal cell proliferation, hematologic disorders, and immune disorders, among others. In certain of the methods, the cytidine analog is formulated in an oral dosage form and administered orally.