Breast invasive lobular cancer (ILC) is one of the most difficult malignancies to diagnose and follow-up due to its tumor morphology. Tumor heterogeneity is the most important reason for treatment failure and diagnostic limitation. Identification of heterogeneity by a non-invasive method, texture analysis that can be done from positron emission tomography (PET), MR, and CT is developed. In ILC, diagnostic sensitivity is lower with 18F-fluorodeoxyglucose ([18F] FDG) PET/CT compared to invasive ductal carcinoma (IDC). In this study, the correlation between histopathological variables and the texture analysis of [18F] FDG PET/CT standard images, and also late images whose contribution to the diagnosis of many malignancies has been investigated are researched.
METHODS
Twenty ILC patients underwent standard and late [18F] FDG PET/CT imaging for staging between May
2007 and December 2018. T and N stages, histological and nuclear grades, estrogen receptor, progesterone
receptor, human epidermal growth factor-2, and Ki-67 were recorded.
RESULTS
Thirty-two textural indices with conventional and formal indices and histogram values were calculated
with LIFEx software to find heterogeneity in standard and late [18F] FDG PET/CT images. Conventional
and discrete indices based on GLRM and GLZM are more correlated than other texture indices.
Greater number of significantly correlations was found between histopathological variables and texture
analysis of late imaging (p<0.05).
CONCLUSION
In our study, the conventional indices, especially in the 2nd degree indices, in the texture analysis performed
with [18F] FDG PET/CT significantly correlated in the ILC, which has lower [18F] FDG affinity
compared to IDC due to the tumoral tissue characteristics. Although the presence of more correlations
with histopathological prognostic information in late images suggests a greater diagnostic contribution,
further studies with more numbers are needed.