Browsing by Author "Legason, Ismail D."

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    Mean platelet counts are relatively decreased with malaria but relatively increased with endemic Burkitt Lymphoma in Uganda, Tanzania, and Kenya
    (British journal of haematology, 2020) Peprah, Sally; Ogwang, Martin D.; Kerchan, Patrick; Reynolds, Steven J.; Tenge, Constance N.; Were, Pamela A.; Kuremu, Robert T.; Wekesa, Walter N.; Masalu, Nestory; Kawira, Esther; Kinyera, Tobias; Otim, Isaac; Legason, Ismail D.; Nabalende, Hadijah; Dhudha, Herry; Mumia, Mediatrix; Ayers, Leona W.; Biggar, Robert J.; Bhatia, Kishor; Goedert, James J.; Mbulaiteye, Sam M.
    Platelet counts are decreased in Plasmodium falciparum malaria, which is aetiologically linked with endemic Burkitt lymphoma (eBL). However, the pattern of platelet counts in eBL cases is unknown. We studied platelet counts in 582 eBL cases and 2 248 controls enrolled in a case-control study in Uganda, Tanzania and Kenya (2010–2016). Mean platelet counts in controls or eBL cases with or without malaria-infection in controls versus eBLcases were compared using Student’s t-test. Odds ratios (ORs) and two-sided 95% confidence intervals (95% CIs) were estimated using multiple logistic regression, controlling for age, sex, haemoglobin and white blood cell counts. Platelets were decreased with malaria infection in the controls [263 vs. 339 9 109 platelets/l, P < 0 0001; adjusted OR (aOR) = 3 42, 95% CI: 2 79–4 18] and eBL cases (314 vs. 367 9 109 platelets/ l, P-value = 0 002; aOR = 2 36, 95% CI: 1 49–3 73). Unexpectedly, platelets were elevated in eBL cases versus controls in overall analyses (mean: 353 vs. 307 9 109 platelets/l, P < 0 0001; aOR = 1 41; 95% CI: 1 12–1 77), and when restricted to malaria-positive (mean 314 vs. 263 9 109 platelets/ l, P < 0 0001; OR = 2 26; 95% CI: 1 56–3 27) or malaria-negative (mean 367 vs. 339 9 109 platelets/l, P < 0 001; OR = 1 46; 95% CI: 1 17–1 83) subjects. Platelets were decreased with malaria infection in controls and eBL cases but elevated with eBL.
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    Plasma magnesium is inversely associated with Epstein-Barr virus load in peripheral blood and Burkitt lymphoma in Uganda
    (Cancer epidemiology,, 2018) Juan, Ravell; Otim, Isaac; Nabalende, Hadijah; Legason, Ismail D.; Reynolds, Steven J.; Ogwang, Martin D.; Ndugwa, Christopher M.; Marshall, Vickie; Whitby, Denise; Goedert, James J.; Engels, Eric A.; Bhatia, Kishor; Lenardo, Michael J.; Mbulaiteye, Sam M.
    Epstein-Barr virus (EBV) causes endemic Burkitt lymphoma (eBL). EBV control was improved by magnesium (Mg2+) supplementation in XMEN, an X-linked genetic disease associated with Mg2+ deficiency, high circulating EBV levels (viral loads), and EBV-related lymphomas. We, therefore, investigated the relationship between Mg2+ levels and EBV levels and eBL in Uganda. Methods: Plasma Mg2+ was measured in 45 women with low or high circulating EBV levels, 40 pediatric eBL cases, and 79 healthy children. Mg2+ uptake by T-lymphocytes was evaluated in samples from healthy donors. Results: Plasma Mg2+ deficiency (plasma level<1.8 mg/dl) was more likely in women with high- vs. low-EBV levels (76.0% vs. 35%; odds ratio [OR] 11.3, 95% CI 2.14–60.2), controlling for age, and in eBL cases than controls (42.0% vs. 13.9%; OR 3.61, 95% CI 1.32–9.88), controlling for sex, age group, and malaria status. Mg2+ uptake by T-lymphocytes was related to extracellular Mg2+ concentration. Interpretation: Plasma Mg2+ deficiency is associated with high EBV levels and eBL.