Assisted reproductive techniques like IVF, egg freezing, and ovarian tissue banking can help women under 40 preserve their fertility during cancer treatment. These methods involve freezing embryos, eggs, or ovarian tissue to protect fertility. Ovarian tissue freezing is still being studied. The Human Fertilisation and Embryology Authority regulates storage of embryos, eggs, and sperm. Transplanting frozen ovarian tissue can be done through surgery. Women should receive detailed information and counseling before choosing these fertility preservation methods.