NK3 is a type of natural killer (NK) cell, which is a crucial component of the immune system. These cells play a vital role in the body's defense against infections and tumors by identifying and destroying harmful cells. NK3 cells are known for their ability to recognize stressed cells in the absence of antibodies, making them essential for early immune responses. Research on NK3 has expanded in recent years, focusing on their potential in cancer immunotherapy. By harnessing the power of NK3 cells, scientists aim to develop treatments that enhance the body's ability to fight cancer more effectively, offering new hope for patients with various malignancies.