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The biopsy showed the following immunohistochemical pattern: CD34+, HHV-8+, S-100-, Desmin-, ACT 1A4-, CD117-, AE1-AE3-, MIB1 http://www.selleckchem.com/products/ABT-263.html with HIVs detrimental effect on immune system and HIVs Tat protein proangiogenic properties [1]. KS is a puzzling http://www.selleckchem.com/products/MK-2206.html condition of unclear, possibly endothelial origin. Its epidemical forms may have visceral involvement, most often in the HIV positive patients. It is a vascular lesion of low-grade malignant potential, associated with HHV-8 infection [2]. KS-associated herpesvirus (KSHV) is also associated with primary effusion lymphoma (PEL), a subset of diffuse large B-cell lymphomas, and multicentric Castleman's disease. PEL was initially described in the setting of HIV infection, even http://www.selleck.cn/products/Erlotinib-Hydrochloride.html if a number of cases have been found in HIV-negative patients without a specific immunodeficiency syndrome who sometimes also had KS. Direct lymphocyte transformation by a given microbial agent has emerged with the description of several lymphomas developing in the context of chronic antigen-dependent immune stimulation, among which HP-associated gastric (MALT) lymphoma is the best characterized. Lymphotropic transforming viruses (as EBV or HH8) directly infect a subset of lymphoid cells in which they express viral oncogenes. As microbial species (e.g., HP), they persist in host tissues and trigger a sustained lymphoid proliferation, giving a selective advantage to lymphoid clones that still remain dependent on antigen stimulation. In fact, in MALT lymphomas, lymphoid tissue accumulates in gastric mucosa in more than 90% of cases, a consequence of HP infection. The geographic heterogeneity in the incidence of B-cell LNH suggests that environmental factors such as infections might have a role in lymphomagenesis, because the lymphoid proliferation increases the risk of transformation, and the sustained activation of the lymphoid system, which can be observed during chronic infection, immunodeficiency, and autoimmunity, constitutes a risk factor for lymphomas [3]. The relatively rapid occurrence of low-grade MALT lymphoma and KS in this patient reflects the presence of two malignancies that are related to HP and KSHV/HHV-8, respectively.