Abstract
Background Angiogenesis plays a key role in the development, maintenance, and progression of
tumor. The incidence of non-Hodgkin's lymphoma (NHL) is increasing from the past three
decades.
Materials and Methods The aim of the study is to evaluate microvessel density (MVD) using CD34 monoclonal
antibody and vascular endothelial growth factor (VEGF) using monoclonal antibody that
were studied in pretreatment paraffin-embedded tissue samples of 60 cases.
Results MVD was found to be increased in parallel with increasing grade of tumor. B-NHL had
a mean MVD of 79.5 ± 8.8 (no./mm2), while T-NHL had a mean MVD of 183 ± 37.6 (no./mm2). VEGF expression was seen in 42 cases (70%), 20 cases (33.3%) showed strong VEGF
expression, and the remainder showed either weak (36.6%) or no (30%) staining. Strong
VEGF expression is seen in 100% cases of T-NHL and 77.7% cases of B-NHL. Mean MVD
and VEGF expression was found to be correlated significantly with the histological
grade of NHL (p = 0.001 and p = 0.000, respectively). Average microvessel counts were 53, 82.9, and 130.8 vessels
(no./mm2) for negative, weak, and strong VEGF staining, respectively. These differences were
statistically significant (p = 0.005 for strong vs. negative and p = 0.091 for strong vs. weak VEGF staining individually).
Conclusion As the grade of tumor progresses, the angiogenic potential also advances which seems
to depend on VEGF. The presence of higher MVD in high-grade lymphomas can be utilized
for antiangiogenic drugs.
Keywords
angiogenesis - CD34 - hot spots - microvessel density - non-Hodgkin's lymphoma
