PD98059 is widely used in biomedical research to inhibit the MEK/ERK signaling pathway, which plays a key role in cell proliferation, differentiation, and survival. It is commonly applied in studies involving cancer, where researchers use PD98059 to suppress abnormal cell growth by blocking MEK activation. This compound helps in understanding the role of ERK pathway in tumor development and can enhance the effectiveness of other anticancer agents in combination therapies. It is also used in neuroscience research to investigate ERK involvement in synaptic plasticity, learning, and memory. Due to its specificity, PD98059 serves as a valuable tool for dissecting signaling events in cellular and animal models.