Clinical, morphologic and immunohistochemical data of 51 patients with stage T2N1-3M0 breast cancer treated in the N.N. Blokhin Russian Cancer Research Center of Russian Academy of Medical Sciences in 2002 was analyzed. Expression of Pgp 170 was found in 19 patients. Relationship between immunophenotype of stage T2N1-3M0 breast cancer cells and main clinical and morphologic fea- tures, treatment provided and expression of multiple drug resistance gene MDR1.

The paper presents literature data and results of own studies on the Kaposi's sarcoma herpesvirus (KSHV) and its association with Kaposi's sarcoma (KS), the primary effusion lymphoma (PEL) and multicentric Kastleman disease (MCD). The obtained data show that all 3 main clinical forms of KS, diagnosed in Russia, are significantly associated with KSHV, though not always in 100% of cases. Distinct groups of persons with high prevalence of virus infection have been detected among patients with other forms of cancer and non-cancer diseases that may represent a risk factor for development of KS. It was found that the prostate, especially in patients with carcinoma of the prostate and KS could be an important localization of virus and intimate contact with these patients should be limited. For the first time in Russia HIV-negative case of PEL associated with KSHV had been diagnosed and studied in details. It was also demonstrated that isolates of KSHV, circulating in the country, belong to the two major genetic subgroups of the virus (A and C), a widely represented in the European countries and in the United States, which indicates a common origin of the virus in these countries. The current methodologies of KS' treatment are also presented.