Which data element is explicitly part of NCDB's pathology-related data?

• A. Tumor staging
• B. Type of first-course treatment
• C. Histology characteristics
• D. Survival information

Answer: (C)

Pathology data elements come from the tissue analysis done by a pathologist, describing the tumor's microscopic characteristics. Histology characteristics capture the specific type of tumor cells and how differentiated they are (for example, ductal versus lobular carcinoma, and the grade of differentiation). This direct microscopic classification is a core pathology descriptor and helps define tumor biology, prognosis, and treatment options. Tumor staging, first-course treatment, and survival are not purely pathology descriptors—staging combines pathology with imaging and clinical information, treatment is clinical management, and survival is an outcome. Therefore, histology characteristics are the explicit pathology-related data element.