CDC73 and tumor of parathyroid gland: This led to the third major achievement in parathyroid pathology—the current (2022) WHO classification that is based on deeper understanding of the pathogenesis of parathyroid disease, bringing at least three revolutionary innovations [12] in regard to (1) multiglandular parathyroid disease in primary hyperparathyroidism; as well as (2) atypical parathyroid tumour and (3) the novel concept of parafibromin-deficient parathyroid neoplasms.