PTGS2 and non-Hodgkin lymphoma: Another meta-analysis demonstrated no association between NSAIDs and non-Hodgkin lymphoma (Bernatsky et al, 2007) risk, but the only study on COX2 inhibitors found a possible increased risk associated with regular use (Flick et al, 2006) (OR 1.58, 95% CI 0.68–3.67).