Table 4. Genotype-Phenotype Correlations and American Thyroid Association (ATA) Risk Levelsa,b
| Mutation | ATA Risk Level | Medullary Thyroid Cancer | Primary Hyperparathyroidism | Pheochromocytoma | References |
| R321Gc | A | MA | [133] | ||
| A510V | Unknown | [134] | |||
| E511Kc | Unknown | [134] | |||
| 531/9 base pair duplication | A | MA | [135] | ||
| 532 duplicationc | A | Unknown | [136] | ||
| C515Sc | A | MA | [137] | ||
| C531Rc | MA | [134] | |||
| G533C | A | MA | R | [138-142] | |
| R600Qc | A | MI | [143] | ||
| K603Ec | A | MI | [144] | ||
| Y606Cc | A | Unknown | [145,146] | ||
| C609F/R/G/S/Y | B | MA | MI | R/MI | [34,62,121,127,147-151] |
| C611R/G/F/S/W/Y | B | MA | MI | R/MI | [62,121,127] |
| C618R/G/F/S/Y | B | MA | MI | MI | [62,121,127,152-155] |
| C620R/G/F/S/W/Y | B | MA | MI | MI | [62,121,127,148,154] |
| C630R/F/S/Y | B | MA | R | R | [115,156] |
| D631Y | B | MI | R | MA | [157-159] |
| 633/9 base pair duplication | B | MA | MI | [160] | |
| C634R | C | MA | MI | MA | [62,121,161,162] |
| C634G/F/S/W/Y | C | MA | MI | MA | [62,121,154,161-163] |
| C634Y/Y791F | MA | R | MA | [164] | |
| 634/12 base pair duplication | B | MA | MI | [165] | |
| 635/insertion ELCR;T636P | A | MA | [145] | ||
| S649L | A | MI | R | [34,166-168] | |
| K666E/Nc | A | MI | MI | [134,145,169] | |
| S686Nc | MI | [154] | |||
| E768D | A | MA | R | R | [62,115,157,170] |
| R770Qc | Unknown | [171] | |||
| N777Sc | A | MI | [172] | ||
| L790F | A | MA | R | R/MI | [157,173,174] |
| Y791F | A | MA | MI | MI | [157,173,175] |
| V804L | A | MA | MI | R | [62,173,176] |
| V804M | A | MA | R | R | [62,173,176-178] |
| V804M+V778Ic | B | MA | [179] | ||
| V804M+E805Kd | D | MA | MA | [113] | |
| V804M+Y806Kd | D | MA | MA | [114-116] | |
| V804M+S904Cc,d | D | MA | MI | [117] | |
| G819Kc | A | Unknown | [34] | ||
| R833Cc | A | Unknown | [180] | ||
| R844Qc | A | Unknown | [34,157] | ||
| L881Vc | Unknown | [171] | |||
| A883Fd | D | MA | MA | [110,111,181] | |
| R886Wc | A | MA | [182] | ||
| S891A | A | MA | MI | R | [34,183-186] |
| R912P | A | MI | MI | [34,187] | |
| M918Td | D | MA | MA | [62,154,188] |
| MA = majority (>50%); MI = minority (10%–50%); R = rare (<10%). | |||||
| aRefer to Table 5 for more information about the ATA risk levels. | |||||
| bAdapted from Kloos et al.[25] | |||||
| cAssociated with multiple endocrine neoplasia type 2 mutations. | |||||
| dAssociated with mutations based on limited families/case reports and may represent variants of unknown significance. |
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