Fetal microchimerism in human brain tumors

Area of Science:

• Oncology
• Immunology
• Genetics

Background:

• Sex differences in cancer incidence and survival are well-documented, with various contributing mechanisms.
• Fetal microchimerism, the presence of fetal cells within the maternal body, has shown prognostic significance in other cancers.
• The role of fetal microchimerism in primary adult brain tumors remains unexplored.

Purpose of the Study:

• To investigate the frequency and potential role of fetal microchimerism in two common adult brain tumors: meningioma and glioblastoma.
• To determine if fetal microchimerism is present in these brain tumors and if it correlates with clinical or molecular features.

Main Methods:

• Quantitative PCR was used to detect male DNA in tumor samples from women with a history of male pregnancy.
• Fluorescence in situ hybridization (FISH) for X and Y chromosomes confirmed the presence of intact male cells within tumor tissue.
• Two brain tumors were selected: meningioma (sex hormone-responsive, higher incidence in women) and glioblastoma (sex hormone-independent, higher incidence in men).

Main Results:

• Fetal microchimerism was detected in approximately 80% of glioblastoma cases and 50% of meningioma cases.
• No significant correlations were found between the presence of microchimerism and standard clinical or molecular diagnostic features.
• The study identified a high prevalence of fetal microchimerism in both glioblastoma and meningioma.

Conclusions:

• Fetal microchimerism is prevalent in adult primary brain tumors, including glioblastoma and meningioma.
• The presence of fetal microchimeric cells warrants further investigation for their impact on brain tumor development and prognosis.
• Prospective evaluation of fetal microchimeric cells' impact is recommended.