To the editor: Germ line–activating mutations of protein tyrosine phosphatase PTPN11 (Shp2), a positive regulator of the Ras signaling pathway,[1][1] account for more than 50% of patients with Noonan syndrome.[2][2]… Click to show full abstract
To the editor: Germ line–activating mutations of protein tyrosine phosphatase PTPN11 (Shp2), a positive regulator of the Ras signaling pathway,[1][1] account for more than 50% of patients with Noonan syndrome.[2][2] These patients have an increased risk of developing leukemias,[3][3] especially
               
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