ABSTRACT
@#Successful targeting and inhibition of the programmed cell death-1/ programmed cell death-ligand 1 immune checkpoint pathways by monoclonal antibody stimulates an immune response against tumors, has led to a rapidly expanding repertoire of immune checkpoint inhibitors (ICIs) for the treatment of various cancers. Immune checkpoint therapy has dramatically changed the therapeutic landscape of certain types of cancers. However, hyperprogressive disease (HPD) is emerging as a new pattern of progression in cancer patients treated with ICIs, characterized as an absolute increase in the tumor growth rate exceeding 50% per month. This article discusses the concept of HPD, hypotheses as to the underlying biology, and what needs to be done to better understand and identify strategies to prevent or overcome HPD related to checkpoint blockade therapy.