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How to Understand NMDP Transplant Center Statistics

When you are choosing a transplant center for a bone marrow or cord blood transplant, you may want to compare the survival statistics at different centers. The National Marrow Donor Program (NMDP) transplant center listings can help you compare survival rates at all NMDP U.S. transplant centers.

Because statistics can be hard to understand, we recommend you discuss them with your doctor. Keep in mind that these statistics may address some — but not all — of the factors that are important to consider when selecting a transplant center.

The center-specific analysis

Each U.S. NMDP transplant center's online listing includes a section labeled Center-Specific Analysis. This analysis covers only patients who received their transplants from January 2001 through December 2005. It includes data on bone marrow, peripheral blood cell (PBSC) and cord blood outcomes through one year post transplant.

The center-specific analysis considered many recipient-specific factors known to influence transplant survival, such as age, diagnosis, disease stage, general health, etc.

Results shown in the Center-Specific Analysis section of each transplant center listing can help you compare the center's performance with that of other NMDP U.S. transplant centers. The results include three items specific to each center, which are each explained below:

Overall disease condition of patients
Actual one-year survival
Predicted one-year survival

Center-specific analysis example

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Overall disease condition

The overall disease condition of patients (number 2 under Center-Specific Analysis), also referred to as "risk level," is a measure of the patients' health factors that predict better or worse survival after transplant. Each transplant center is placed in one of five equally-sized groups based on the average "risk" (or health factors) of patients treated at that center. It does not indicate the risks of being treated at that center.

The risk levels, based on overall disease condition of treated patients, are measured on a scale from 1 (low risk) to 5 (high risk).

Actual one-year survival rate

The actual one-year survival rate (number 3 under Center-Specific Analysis) is based on all patients transplanted at the transplant center from January 2001 through December 2005. This number reflects the percentage of patients at this center who survived one year or more post transplant.

Predicted one-year survival rate

The predicted one-year survival rate (number 4 under Center-Specific Analysis) is adjusted for the mix of risk or health factors that can affect patient survival: HLA matching, recipient's age, disease and disease stage, overall health before transplant, etc.

For a more detailed explanation of the methods used to determine survival rates, please contact the NMDP Office of Patient Advocacy.

Survival by patient diagnosis and age

It may be important to you to find out if a center has experience treating other people with your disease. For disease-specific information, look in the Survival by Patient Diagnosis and Age section of each center's listing. If your disease is listed, find the column within your age range to find transplant and survival numbers for unrelated donor bone marrow or cord blood transplants facilitated by the NMDP.

The totals listed are for the period January 2001 through December 2005. These numbers include one year post-transplant follow-up (through December 2006).

For each transplant center, there are seven age categories: