PDGFRB and gastrointestinal stromal tumor: It is hard for imaging examination to distinguish the real invasion or tumor just leaning against adjacent organs or tissues; for effective neoadjuvant therapy, aspiration biopsy is necessary for not only diagnosis but also gene mutation detection for KIT and PDGFR, but conducting biopsies in such highly malignant GIST may increase the risks of tumor rupture or implantation metastasis.