Coding of the behavior of a tumor, coded by the first digit after slash in ICD-O-Morphology codehttps://difuture.debenignborderline malignancy or uncertain malignant potentialnoninvasiv resp. carcinoma in situinvasive resp. malignant primary tumormetastasis resp. secondary tumor, not used in German cancer registriesmalignant, uncertain whether primary or secondary tumor, not used in German cancer registries