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BEIJING, Jan. 23 -- More than two million potential donors have been enlisted in the China Marrow Donor Program (CMDP), ranking the world's fourth largest in terms of donors after the United States, Germany and Brazil.

Gao Dongying, vice director of the CMDP, said the number of potential donors reached one million in 2009.

As of the end of 2014, the CMDP facilitated hemopoietic stem cells (HSC) for 4,680 patients home and abroad.

Established in 1992, the CMDP now has 31 provincial-level branches, 30 HLA (Human Leukocyte Antigen) typing laboratories, six HLA high-resolution confirmatory typing laboratories and one quality control laboratory. It also collaborates with more than 100 domestic hospitals.