Background/aim: Emerging evidence suggests that Insulin-like growth factor II mRNA-binding protein 3 (IMP3) promotes tumor progression in several human malignancies. We investigated whether IMP3 expression has clinicopathological and prognostic significance in gallbladder adenocarcinoma (GBAC).
Patients And Methods: We examined immunohistochemical IMP3 expression in 204 GBACs and its associations with clinicopathological parameters and patient outcomes.
Results: The majority (87.7%) of GBACs exhibited at least focal cytoplasmic and membranous IMP3 immunoreactivity. Tumor-specific IMP3 expression highlighted proper muscle invasion, which was not detected in the corresponding hematoxylin and eosin-stained slides. This finding upgraded pathological tumor stage (pT) from pT1a to pT1b in four well-differentiated GBACs. High IMP3 expression was associated with high histological grade, advanced stage, and lymphatic invasion, as well as worse overall survival.
Conclusion: Tumor-specific IMP3 expression in GBAC is helpful in determining the tumor extent, especially in well-differentiated tumors. High IMP3 expression reflects aggressive oncogenic behavior of GBAC. IMP3 expression may be used as a diagnostic and prognostic marker in GBAC.
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