[Expression of Insulin-like Growth Factor Recepter Type I in CD34⁺ Cells of Patients with Myelodysplastic Syndromes]

To explore the expression level of insulin-like growth facter (IGF-IR) in CD34⁺ cells of patients with myelodysplastic syndromes(MDS).

Flow cytometry was used to detect the expression of IGF-IR in the CD34⁺ cells of 100 MDS patients and 18 normal controls.

The average IGF-IR expression level in the CD34⁺ cells of 100 MDS patients (41.0±28.1)% was statistically and significantly elevated in comparison with the corresponding level in normal controls(4.3±1.8)%,(P<0.0001). The average expression level of 22 cases in high-risk groups was very significantly increased, compared with that in 78 cases of low-risk groups[(66.5±27.8)% vs (34.5%±24.9)%](P<0.0001), and the average expression level in 23 patients with chromosome abnormality was very significantly increased in comparison with that in rest 77 patients [(56.0±30.9)% vs (36.9%±26.2)%](P<0.01).

The over-expression of IGF-IR in CD34⁺ cells of MDS patients suggests that the IGF-IR may involve in the origin, occurrence and progress. The average IGF-IR expression level is markedly elevated in high-risk groups and the patients who showed chromosome abnormality, this trend revealed that IGF-IR correlates with malignant clonal proliferation in MDS patients, thus providing a basis for their prognosis and outcome evaluation.