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Histological grades of 609 patients with parathyroid cancer from the Surveillance, Epidemiology, and End Results (SEER) database, 1975–2016.
| Grade (n = 609) | Frequency (%) | |
| Unknown | 533 (87.5) | |
| Known | 76 (12.5) | |
| Grade where known (n = 76) | Frequency | p-value < 0.005 |
| Grade 1: Well-differentiated | 57 (75) | |
| Grade 2: Moderately differentiated | 13 (17) | |
| Grade 3: Poorly differentiated | 4 (5) | |
| Grade 4: Undifferentiated/anaplastic | 2 (3) |
