RESUMO
OBJECTIVE: In this observational pilot study, we aimed to evaluate the role of gallium-68-labelled DOTA-TATE (Ga-TATE) PET/computed tomography (CT) scanning in patients with multiple myeloma (MM), considering previous promising results obtained from conventional somatostatin receptor scintigraphy with In pentetreotide. MATERIALS AND METHODS: Twenty-one patients with a diagnosis of MM were prospectively included in this study: eight patients were referred for initial staging and 13 patients for restaging purpose. Both fluorine-18 fluorodeoxyglucose (F-FDG) and TATE PET/CT scanning were performed in all patients. RESULTS: All patients had one or more PET-positive lesion on either F-FDG or TATE scans. Six patients had an additional diffusely increased bone marrow activity on F-FDG scans, five of whom also had a concordant bone marrow appearance on TATE scans. Each PET set (either F-FDG or TATE) was positive in 19 patients. There was a discordant result in four (19%) patients between F-FDG and TATE scans. F-FDG scans showed 112 lesions (86 TATE-positive; 26 TATE-negative) in 19 patients, whereas TATE scans showed 108 lesions (86 F-FDG-positive; 22 F-FDG-negative) in 19 patients. No significant difference was found between the two modalities in terms of lesion numbers detected (P=0.67). However, the presence of diffuse bone marrow uptake of TATE seems to be a predicting factor for the overall survival (P=0.033, hazard ratio: 15.2 and 95% confidence interval: 1.2-185.5). CONCLUSION: TATE PET/CT seems to be an alternative imaging modality and may play a complementary role in MM management, at least by providing a different pathobiological insight into the disease.
Assuntos
Mieloma Múltiplo/diagnóstico por imagem , Compostos Organometálicos , Tomografia por Emissão de Pósitrons combinada à Tomografia Computadorizada/métodos , Adulto , Idoso , Feminino , Radioisótopos de Flúor , Fluordesoxiglucose F18 , Radioisótopos de Gálio , Humanos , Masculino , Pessoa de Meia-Idade , Tomografia por Emissão de Pósitrons combinada à Tomografia Computadorizada/estatística & dados numéricos , Estudos Prospectivos , Compostos RadiofarmacêuticosRESUMO
Bone metastasis is common in patients with lung, prostate, and breast cancers but it isn't common in stomach cancer. Gastric carcinoma infrequently metastasizes to the bone and rarely in an osteoblastic form. Herein we presented a rare case of signet ring cell gastric adenocarcinoma in early stage with osteoblastic metastasis. To our knowledge our case was the youngest signet cell gastric cancer patient with osteoblastic bone metastasis reported in literature.