SEER is an authoratitive source of information on cancer incidence and survival in the United States. SEER currently collects and publishes cancer incidence and survival data from population-based cancer registries covering approximately 28 percent of the U.S. population.
9 - Grade/differentiation unknown, not stated, or not applicable
Refractory neutropenia is characterized by >=10% dysplastic neutrophils in the peripheral blood or bone marrow; the dysplasia is principally manifest as nuclear hypolobation and hypogranulation.
(This code is effective for cases diagnosed 2010 and later. For cases diagnosed prior to 2010 see code 9989/3.) There will be >= 10% dysplastic neutrophils in the peripheral blood or bone marrow. Neutropenia secondary to drug therapy, toxic exposure, infectious processes, immune mechanisms, or other causative factors must be excluded. The other myeloid cell lines do not show significant dysplasia.