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The association between elevated values of reactive oxygen species and a decreased antioxidant capacity defines oxidative stress. Oxidative stress involvement is blamed in many diseases, including obesity. We evaluated oxidative stress levels by FORT (Free Oxygen Radical Testing � reactive oxygen species levels) and FORD (Free Oxygen Radical Defence � antioxidant capacity value) assays in obese subjects vs. controls. FORT values were high and FORD values were low in obese patients vs. controls, notably in obese subjects with comorbidities (diabetes, hypertension, dyslipidaemia, coronary heart disease, anaemia, hepatic steatosis). We found positive correlations between FORT values and total cholesterol, uric acid, triglycerides, LDL, body mass index, HDL/total cholesterol ratio, and negative correlations between FORT and age, HDL. FORD levels correlated oppositely to FORT. Our results suggest that obesity and oxidative stress are linked.

Diffuse large B-cell lymphoma (DLBCL) is the most common aggressive B-cell non-Hodgkin�s lymphoma. Oxidative stress, defined as an imbalance between the levels of pro-oxidants and the antioxidant defense, is involved in lymphomagenesis via chronic inflammation and is associated with a decrease in circulating levels of high-density lipoprotein (HDL) cholesterol. We evaluated oxidative stress levels in DLBCL patients by FORT (Free Oxygen Radicals Testing) and FORD assays (Free Oxygen Radical Defense), and investigated the relationship between oxidative stress markers and HDL-cholesterol levels. Our results suggest that oxidative stress and decreased levels of HDL-cholesterol might play a role in DLBCL pathogenesis via chronic inflammation.

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