38. A 60 year old man presents with abdominal pain and a CT reveals a mass within thegastrointestinal system, which is resected. Histopathologic examination reveals asubmucosal mass composed of spindle cells with lightly eosinophilic cytoplasmarranged in a syncytial pattern. The pathologic diagnosis is a GIST, spindle cell type.Which of the following answer choices correlates with the most favorable prognosis forthis patient?
(A) KIT mutation present
(B) Mass 11 cm in greatest dimension
(C) Mass located in the jejunum
(D) Mitotic rate ＞10 per 50HPF