4-Amino-5-iodo-7-(2-β-C-methyl-β-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidine is a purine nucleoside analogue. Purine nucleoside analogs have broad antitumor activity targeting indolent lymphoid malignancies. Anticancer mechanisms in this process rely on inhibition of DNA synthesis, induction of apoptosis, etc.