One study showed that indolent non-Hodgkin lymphoma (NHL) had low Ki-67 LI (less than about 30%), including 23% for small cell lymphoma, 25%, for mantle cell lymphoma, 28.5% for marginal zone lymphoma, and 34.6% for follicular lymphoma, whereas the mean Ki-67 LIs of aggressive lymphomas were above 66.4%.[9] However, this observation mainly reflects data from B-cell lymphomas. This evidence concerns the gene MKI67 and marginal zone lymphoma.