WHO Classification
WHO Classification of Hematopoietic & Lymphoid Neoplasms
with ICD-O-3 Codes
NOTE: Only major disease categories are listed.
{} indicates an alternative description of the neoplasm
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SEER Training Modules
The SEER Training Website is a training resource for oncology data specialists (ODS) and cancer registration trainees. It is not intended to provide medical advice or to guide clinical care, diagnosis, or treatment. NCI urges users to consult with a qualified physician for diagnosis and for answers to their personal medical questions.