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Malignant lymphoma in African children: three decades of discovery
1Anatomic Pathology, Loyola University Medical Center, Maywood, Illinois 60153.
Insights
Burkitt lymphoma (BL) recognition stemmed from clinical observation and pathology. Epstein-Barr virus (EBV) and malaria are key in endemic BL, while immunosuppression and c-myc translocations are crucial in sporadic BL.
Area of Science:
- Oncology
- Virology
- Epidemiology
- Genetics
Background:
- Burkitt lymphoma (BL) was initially recognized in African children through clinical observations and pathological data.
- BL is a worldwide cancer, with higher incidence in Africa linked to environmental factors.
- The discovery of Epstein-Barr virus (EBV) association spurred extensive research into BL pathogenesis.
Purpose of the Study:
- To elucidate the etiological factors and pathogenesis of endemic and sporadic Burkitt lymphoma.
- To identify the roles of environmental factors, viral infections, and genetic events in BL development.
- To understand the common mechanisms in carcinogenesis using BL as a model.
Main Methods:
- Clinical observations and bedside epidemiology.
- Analysis of cancer registry data and pathological interpretation.
- Epidemiological studies combined with modern laboratory techniques, including genetic analysis.
Main Results:
- Endemic BL (eBL) is strongly associated with early Epstein-Barr virus (EBV) infection and holoendemic malaria.
- Sporadic BL (sBL) pathogenesis involves immunosuppression and T-cell deregulation, distinct from eBL's primary drivers.
- A consistent genetic event in both eBL and sBL is the chromosome 8 translocation involving the c-myc oncogene.
Conclusions:
- Early EBV infection and malaria are critical for endemic BL, while immunosuppression and genetic alterations are key in sporadic forms.
- The c-myc oncogene translocation is a pivotal genetic event in Burkitt lymphoma pathogenesis.
- The study of Burkitt lymphoma provides insights into carcinogenesis applicable to other diseases.
Abstract:
The recognition of Burkitt lymphoma (BL) as a clinical syndrome and a pathological entity in African children resulted from astute clinical observations (bedside epidemiology), the availability of cancer registry data and accurate pathological interpretation. Following the early studies in Africa, it soon became evident that this tumor occurred worldwide and the excess of cases in Africa was an incidence phenomenon associated with specific environmental factors. The sentinel discovery of the Epstein Barr virus (EBV) and its association with BL stimulated a wide variety of scientific investigations which have had an impact of virtually every discipline and biology. Epidemiological observations linked to modern laboratory techniques have provided etiological insights which implicate specific environmental factors and genetic events in the pathogenesis of BL and other immunoproliferative diseases. Early infection with EBV and holoendemic malaria are clearly of paramount importance in the development of endemic BL (eBL). These factors do not play a role in the majority of sporadic BL (sBL) cases, but immunosuppression and T-cell deregulation almost certainly are common denominators. The final or principle genetic event in both instances would appear to be the chromosome 8 translocation involving the c-myc oncogene and structural alteration. It is expected that the BL model will continue to be a useful one for identifying basic mechanisms in carcinogenesis which may be applicable as well to a variety of non-neoplastic diseases.