To reflect contemporary pathology practice and terminology, a number of revisions and enhancements have been made to ICD-O-3. More acronyms have been included as synonyms in the numeric list and in the alphabetic index, such as DCIS (ductal carcinoma in situ) and PNET (primitive neuroectodermal tumor).

Other acronyms include:

Accronym Description
MALT Mucosal-associated lymphoid tissue
SALT Skin-associated lymphoid tissue
BALT Bronchial-associated lymphoid tissue
SETTLE Spindle epithelial tumor with thymus-like element
CASTLE Carcinoma showing thymus-like differentiation
PIN Prostatic intraepithelial neoplasia
AIN Anal intraepithelial neoplasia
DCIS Ductal carcinoma in situ
PNET Primitive neuroectodermal tumor
CPNET Central Primitive neuroectodermal tumor
PPNET Peripheral primitive neuroectodermal tumor
RA Refractory anemia
RARS Refractory anemia with ringed sideroblasts
RAEB Refractory anemia with excess blasts
RAEB-T (Refractory anemia with excess blasts in transformation)
MPNST Malignant peripheral nerves sheath tumor