ABSTRACT
The association of gastrointestinal stromal tumor (GIST), synchronous or metachronous with other tumors is reported in special literature, the most frequent being associated with other gastrointestinal tumors. GISTs are the most common mesenchymal neoplasm of the gastro-intestinal tract with a malignant potential. We present a case of 68-year-old male patient diagnosed with GIST stage IV, unreachable due to liver metastases, treated with Imatinib, diagnosed at 13 months of prostate adenocarcinoma diagnosis [treated with hormonal therapy (HT) and external beam radiotherapy (EBRT)]; at 45 months from the first neoplasia diagnosis, the patient was diagnosed with the third neoplasia - lung squamous carcinoma - right inferior lobe, for which performed EBRT. The coexistence of GIST with other malignancies with different histology, remain a challenge for the clinician from etiological, and also from therapeutically actions point of view.
