Nucleostemin expression in invasive breast cancer

Area of Science:

• Oncology
• Molecular Biology
• Cancer Stem Cell Research

Background:

• The cancer stem cell hypothesis suggests stem-like properties in cancer cells, including self-renewal and differentiation.
• Nucleostemin (NS), a protein found in neural stem cells, is implicated in stemness and nuclear protein binding, including p53.
• NS expression in various cancers highlights its potential role in cancer pathogenesis.

Purpose of the Study:

• To investigate the clinicopathological significance of Nucleostemin (NS) in invasive breast cancers.
• To determine the prognostic impact of NS expression in relation to patient outcomes.

Main Methods:

• Examined NS immunoreactivity in 220 invasive breast cancer tissue samples using tissue microarrays.
• Assessed correlations between nuclear NS and p53 expression (defined as ≥10% positive cells) and clinicopathological parameters.

Main Results:

• NS positivity was observed in 64.5% of tumors and significantly correlated with estrogen receptor (ER), HER2, and p53 positivity.
• Patients with NS-positive tumors had significantly shorter disease-free survival.
• Co-positivity for NS and p53 was associated with a significantly poorer prognosis; NS was an independent prognostic indicator.

Conclusions:

• Nucleostemin (NS) may significantly influence breast cancer progression, particularly in conjunction with p53 alterations.
• NS status shows potential as a prognostic marker for luminal and HER2-type breast cancers.