Granzyme B is a serine protease that is expressed by cytotoxic T cells and natural killer cells, and plays a crucial role in the immune system's ability to eliminate infected cells and tumor cells. Granzyme B works in conjunction with perforin to induce apoptosis (programmed cell death) in target cells.
In the context of cancer, granzyme B has been found to have both positive and negative effects.
Granzyme B is an important marker of immune activity in the tumor microenvironment, and its expression is often associated with better prognosis in various cancers. High levels of Granzyme B in tumor-infiltrating lymphocytes indicate an effective anti-tumor immune response, which can help control tumor growth and improve patient outcomes.
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