Growth/adhesion-regulatory tissue lectin galectin-3: stromal presence but not cytoplasmic/nuclear expression in tumor cells as a negative prognostic factor in breast cancer.
BACKGROUND
The endogenous lectin galectin-3 can regulate cell adhesion and proliferation in vitro, thus prompting the examination of its clinical relevance in breast cancer.


METHODS
Immunohistochemical processing of tissue sections (n = 273; drop-out rate 20.4%) was used for the assessment of galectin-3 expression. Cytoplasmic/nuclear staining and presence in the tumor stroma were analyzed in human breast cancer patients.


RESULTS
A weak correlation with positive steroid receptor status was revealed for cytoplasmic positivity. Nuclear staining was correlated to the lobular type of invasive carcinoma, and tumor stroma expression to high-grade malignancy. Multiple testing of cut-off points to divide the cases into groups based on different levels of immunopositivity combined with univariate Kaplan-Meier survival analysis and computations following the multivariate Cox regression model disclosed no prognostic correlation to either cytoplasmic or nuclear expression of galectin-3. The presence of galectin-3 in the stroma, however, indicated an unfavorable prognosis. Prediction of overall survival was feasible using a model consisting of stage and c-erbB2 status.


CONCLUSIONS
These data signify that caution should be exercised in extrapolating from the anti-apoptotic/prometastatic activity of galectin-3 in model systems to the clinical situation.
Moisa
Adina
A
Institut für Gerichtliche Medizin der Universität Tübingen, Germany.
Fritz
Peter
P
Eck
Andreas
A
Wehner
Heinz-Dieter
HD
Mürdter
Thomas
T
Simon
Wolfgang
W
Gabius
Hans-Joachim
HJ
D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology; D016022:Case-Control Studies; D002467:Cell Nucleus / Q000378:metabolism / Q000473:pathology; D003593:Cytoplasm / Q000378:metabolism / Q000473:pathology; D005260:Female; D005500:Follow-Up Studies; D037502:Galectin 3 / Q000378:metabolism*; D006801:Humans; D008875:Middle Aged; D015999:Multivariate Analysis; D012044:Regression Analysis; D017154:Stromal Cells / Q000378:metabolism / Q000473:pathology
D037502:Galectin 3