GNAS and myxoma: A total of 18/20 (90%) cases of cellular myxoma had GNAS mutations located in exon 8:9 (45%) on the locus c.G602A:p.R201H, 5 (25%) on c.601 (4/5 c.C601T:p.R201C and 1/5 c.C601A:p.R201S), 2 (10%) on c.2530 (c.C2530T:p.R844C and c.C2530A:p.R844S) and 1 (5%) each on c.A610G:p.T204A and c.G2531A:p.R844H, respectively (Table 2).