[Classification and virus expression of primary cerebral lymphomas]

Area of Science:

• Neuropathology
• Virology
• Oncology

Context:

• Primary cerebral lymphomas (PCL) represent a rare group of central nervous system malignancies.
• Accurate classification of PCL is crucial for understanding their biology and guiding treatment.
• The role of specific viral infections, such as Epstein-Barr Virus (EBV) and human herpes virus 6 (HHV6), in PCL pathogenesis remains under investigation.

Purpose:

• To histologically classify 43 primary cerebral lymphomas (PCL).
• To investigate the genome expression of Epstein-Barr Virus (EBV) and human herpes virus 6 (HHV6) in PCL.
• To assess the applicability of the Updated Kiel Classification to PCL and the role of EBV and HHV6 in immunocompetent patients.

Summary:

• Forty-three primary cerebral lymphomas (PCL) were histologically analyzed. The Updated Kiel Classification was applicable to only 20 tumors; the remaining 23 were classified as small-cell (SC) or large-cell (LC) blastic PCL.
• LC PCL exhibited a dense, tumor-like pattern, while SC PCL showed an inflammation-like pattern with reactive glial and T-lymphocytic cells.
• EBV genome was detected in all 3 AIDS cases but none of the 40 immunocompetent cases. HHV6 was found in 2 immunocompetent cases.

Impact:

• The Updated Kiel Classification is not suitable for the majority of PCL cases.
• EBV and HHV6 do not appear to be significant factors in the development of PCL in immunocompetent individuals.
• This study refines the understanding of PCL classification and viral involvement, impacting future diagnostic and etiological research.