Types 1, 2A, and 3 of the JNET classification were very reliable indicators for HP/SSP, LGD, and SM-d carcinoma, respectively. However, the specificity and positive predictive value of Type 2B were relatively lower than those of others. Therefore, an additional examination such as pit pattern diagnosis using chromoagents is necessary for accurate diagnosis of Type 2B lesions.

Key Points KIT exon 17 mutation is a poor prognostic factor in AML patients with RUNX1-RUNX1T1, but not in those with CBFB-MYH11. NRAS mutation is a poor prognostic factor in AML patients with CBFB-MYH11.

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