Neutrophil to lymphocyte ratio varies in magnitude and biomarker utility based on patient demographics.

Summary: Doctors often use a simple blood test to see if a cancer treatment will work. This test looks at two types of white blood cells. But a new study shows this test isn't the same for everyone. Your age, race, and sex can change the results. Because of this, the test might only be helpful for certain groups of people, and doctors need to be careful when using it.