Graeber seeks to determine how cancer cells evade otherwise effective targeted therapies and to identify new vulnerabilities in the process by which cancers evolve to more aggressive variants. In some cases of cancer, when the main gene driving the cancer is turned off with treatment, the cancer cells can transform into a different cell identity that doesn't rely on that gene.
To better understand these changes in cell identity, Graeber studies how cancer cells dedifferentiate, or revert back to an earlier stage of development. Dedifferentiated cells can evade common treatments such as chemotherapy and radiation and cause recurrence of the disease. This research led Graeber to discover that less mature or dedifferentiated melanoma cells showed sensitivity to a self-inflicted cell death called ferroptosis. Certain subtypes of melanoma, Graeber found, could be targeted by a combination of existing cancer therapies and pro-ferroptotic drugs. Parallel aspects are observed in prostate and lung cancers that escape targeted therapy via trans-differentiation. Graeber is pursuing therapeutic approaches to prevent these resistance-enabling changes in cellular identity.