NOTCH1 and gastric mucosa-associated lymphoid tissue lymphoma: The frequency of TNFAIP3, TET2, and NOTCH1 mutations in H. pylori negative gastric MALT lymphoma is similar to those seen in unselected gastric MALT lymphomas, whereas the previously reported TNFRSF14 alterations affecting gastric MALT lymphomas were absent in the current series [16].