ROR1 expression in mature B lymphoid neoplasms by flow cytometry

Area of Science:

• Hematology
• Immunology
• Oncology

Background:

• Immunophenotyping by flow cytometry is crucial for diagnosing leukemias and lymphomas.
• ROR1 expression is well-documented in chronic lymphocytic leukemia (CLL) diagnosis and minimal residual disease (MRD) monitoring.
• Limited research exists on ROR1 expression patterns in other mature B lymphoid neoplasms (MBLN).

Purpose of the Study:

• To evaluate ROR1 expression in MBLN.
• To associate ROR1 expression with other key markers for MBLN differentiation.
• To assess ROR1's utility in diagnosing MBLN.

Main Methods:

• Studied 767 samples with suspected MBLN undergoing immunophenotyping.
• Analyzed ROR1 expression in conjunction with other relevant immunophenotypic markers.
• Correlated ROR1 expression patterns with specific MBLN subtypes, focusing on CD5 and CD10 expression.

Main Results:

• ROR1 expression was predominantly observed in CD5+/CD10- neoplasms.
• Overall, 60.1% of cases showed positive ROR1 expression.
• The CD5+/CD10- group exhibited a significantly higher proportion (89.9%) and intensity of ROR1 expression.

Conclusions:

• ROR1 evaluation is important for MBLN diagnosis and differential diagnosis.
• ROR1 may aid in the therapy of CLL and other MBLN.
• ROR1 can be a valuable addition to immunophenotypic panels, especially for complex cases.