The chances of an unrelated donor bone marrow match are very low, probably in the tens of thousands or even one in a million. The chances of a successful bone marrow match between relatives are also usually small, not to mention the success rate of a match with a stranger. If the match is made with the immediate parents, the probability is around 50%, a hemi-match, with identical twins it is 100%, and with their siblings it is less, around 25%. In the case of other cousins, it would be even lower. However, with the development of medical technology, hemizygous transplantation techniques have become more mature in clinical practice, solving the problem of donor difficulties. If you find bone marrow that can be a perfect match, you must actively pursue treatment, because the number of successful bone marrow matches is too small. The diseases that are usually treated by bone marrow mating include leukemia, malignant lymphoma, severe reattachment, myelodysplastic syndromes, etc. Currently, the medical technology is very advanced, and there is a certain amount of experience in treating these diseases, so the patient must trust the doctor.