Testing of blood specimens may detect abnormal white blood cells in patients years before the chronic form of lymphocytic leukemia (CLL) develops, according to research published in the current issue of the New England Journal of Medicine.
The finding may lead to a better understanding of cellular changes that characterize the earliest stages of the disease and how it progresses.
Researchers at the National Cancer Institute (NCI), part of the National Institutes of Health, and the U.S. Food and Drug Administration, led the study, which was co-authored by two researchers with Quest Diagnostics Incorporated, Maher Albitar, M.D., Medical Director and Chief of Research and Development, Hematology and Oncology, and Wanlong Ma, M.S., Research and Development Manager, Hematology and Oncology.
For the study, Dr. Albitar and Ms. Ma developed a method to identify abnormal B-cell clones in blood specimens. Quest Diagnostics plans to use a similar approach to develop tests that may one day be used by physicians as an aid in identifying patients who will develop CLL.
"We searched for tumor cells by performing a sophisticated form of flow cytometry as well as molecular testing on frozen samples of whole blood and blood plasma," said Dr. Albitar. "The findings of this study lead to better understanding of biological processes underlying the development of CLL, and give us hope that in the future we will be able to develop new testing techniques to look at blood from patients with abnormal cells and distinguish those who will develop overt cancer from those who will not."
"Quest Diagnostics is the leader in cancer testing, and this study demonstrates the commitment of our science and innovation team to advancing cancer research," said Surya N. Mohapatra, Ph.D., Chairman and Chief Executive Officer, Quest Diagnostics.
CLL is a blood cancer that usually progresses slowly over many years. In this disease, abnormal white blood cells called B-cells accumulate in the blood and the bone marrow. The lymph nodes, spleen, and other organs may also be affected. Although CLL is the most common form of leukemia in adults in Western countries, little is known about what causes the disease or how it develops.
Previous research by the NCI/FDA team and others showed that some family members of CLL patients can have B-cells in their blood that have outer-surface proteins that are similar to proteins found on CLL cells. This abnormal condition, known as monoclonal B-cell lymphocytosis (MBL), occurs in over 10 percent of CLL family members and in about 3 percent to 5 percent of healthy adults over the age of 50, suggesting it might be a precursor of CLL.