The chances of a bone marrow match are very low. If the match is made with the immediate parents, the probability is around 50%, a semi-conjugation, with identical twins the match is 100%, and with their siblings the match is less, around 25%. If it is another cousin, it will be even lower. If it is a stranger, the probability will be very low, probably in the tens of thousands or even one in a million. The probability of a successful bone marrow match between relatives is also usually relatively small, not to mention the success rate of a match with a stranger. If an exact match is found, it is important to actively pursue treatment, as there are so few successful bone marrow matches. The diseases that are generally treated by bone marrow matching are leukemia, malignant lymphoma, and heavy remittance, etc. Currently, medical technology is very advanced and there is some experience in treating these diseases, so patients must trust their doctors.