NR4A3 and acinar cell carcinoma: Of particular note, in some recently published studies, nuclear expression of NOR1 is considered a sensitive and specific diagnostic marker for acinic cell carcinomas (ACCs), a low-grade malignant salivary gland tumor with cells showing serous acinar differentiation, because 1) NOR1 immunostaining was found in all ACC patients, whereas no similar immunostaining was found in non-ACC individuals (Jin et al., 2021; Owosho et al., 2021); and 2) NOR1 can distinguish from its mimics on fine-needle aspiration biopsy specimens (Nguyen et al., 2020).