A 63-year-old man in Norway has been cured of his lifelong HIV infection with the use of his brother's stem cells. The brother, who donated his stem cells to treat the man's life-threatening blood cancer and also had a rare mutation that grants natural resistance to HIV. Four years after the transplant, and two years after stopping antiretroviral therapy, the man appears to be free of the infection. This is the first time a family donor has been used to cure HIV. Despite the risks and risks of the procedure, it is still considered a last resort treatment for blood cancers. The man was first diagnosed with myelodysplastic syndrome in 2018, but the cancer returned after two years.