Ki-67 labelling index in human brain tumours

Area of Science:

• Neuro-oncology
• Pathology
• Cancer Biology

Background:

• Assessing tumor proliferative potential is crucial for diagnosis and prognosis.
• The Ki-67 labelling index (Ki-67LI) is a widely used marker for cell proliferation.
• Brain tumors, including gliomas and metastases, exhibit diverse growth patterns.

Purpose of the Study:

• To investigate and compare the proliferative potential of low-grade gliomas, high-grade gliomas, and metastatic brain tumors.
• To evaluate the utility of Ki-67 labelling index (Ki-67LI) in differentiating tumor types and grades.

Main Methods:

• Analysis of Ki-67 labelling index (Ki-67LI) in 157 brain tumor samples.
• Tumor samples included low-grade gliomas (46), high-grade gliomas (82), and metastatic tumors (29).
• Immunohistochemical staining for Ki-67 antigen on formalin-fixed, paraffin-embedded sections.

Main Results:

• Tumors demonstrated variable Ki-67 labelling index (Ki-67LI) values.
• Significantly higher mean Ki-67LI was observed in high-grade gliomas (AIII & AIV) compared to low-grade gliomas (Al & All).
• Metastatic tumors showed significantly higher mean Ki-67LI than both low-grade and high-grade gliomas.

Conclusions:

• Ki-67 labelling index (Ki-67LI) effectively differentiates tumor grades and types.
• Higher Ki-67LI correlates with increased malignancy and proliferative activity in brain tumors.
• Metastatic brain tumors possess a higher proliferative potential than gliomas.