Changes in biodistribution on ⁶⁸Ga-DOTA-Octreotate PET/CT after long acting somatostatin analogue therapy in neuroendocrine tumour patients may result in pseudoprogression.

ABSTRACT:

Background

To evaluate the effects of long-acting somatostatin analogue (SSA) therapy on ⁶⁸Ga-DOTA-octreotate (GaTate) uptake at physiological and metastatic sites in neuroendocrine tumour (NET) patients.

Methods

Twenty-one patients who underwent GaTate PET/CT before and after commencement of SSA therapy were reviewed. Maximum standardized uptake values (SUVmax) were measured in normal organs. Changes in uptake of 49 metastatic lesions in 12 patients with stable disease were also compared. Serum chromogranin-A (CgA) levels were available for correlation between scans in 17/21 patients.

Results

Mean thyroid, spleen and liver SUVmax decreased significantly following SSA therapy from a baseline of 5.9 to 3.5, 30.3 to 23.1 and 10.3 to 8.0, respectively (p = < 0

SUBMITTER: Cherk MH 

PROVIDER: S-EPMC5781297 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature