Bone marrow is the biggest haematogenous organ as well as an important immunity organ in human body. Most drugs which are ordinarily prepared have difficulties to enter bone marrow because of the influence of marrow-blood barrier (MBB), which results in many difficulties in the diagnoses and therapy of some diseases relating to bone marrow. Especially in the treatment of Leukemia, in order to inhibit the regeneration of abnormal leucocytes, drugs of high-dose are usually used to achieve the efficient concen...