ABSTRACT
The present study describes a local drug delivery system with two functions, which can suppress tumor growth and accelerate wound healing. Thе system consists of a two-layer multicomponent fibrin-based gel (MCPFTG). The internal layer of MCPFTG, which is in direct contact with the wound surface, contains cisplatin placed on a CultiSpher-S collagen microcarrier. The external layer of MCPFTG consists of a CultiSpher-S microcarrier with lyophilized bone marrow stem cells (BMSCs). The efficacy of MCPFTG was evaluated in a rat model of squamous cell carcinoma of the tongue created with 4-nitroquinoline 1-oxide. The results of the study showed that, within 20-25 days, a non-healing wound of the tongue was formed in animals that underwent only 85% resection of squamous cell carcinoma, while rapid progression of the residual tumor was concomitantly observed. Immunohistochemical methods revealed high expression of cyclin D1 and low expression of E-cadherin in these animals. Additionally, high expression of p63 and Ki-67 was noted. In 80% of animals with squamous cell carcinoma of the tongue that were treated with MCPFTG after 85% tumor resection, a noticeable suppression of tumor growth was evident throughout 150 days, and tumor recurrence was not detected. Immunohistochemistry revealed low or moderate expression of cyclin D1, and high expression of E-cadherin throughout the whole observation period. The MCPFTG-based local drug delivery system was shown to be effective in suppressing tumor growth and preventing recurrence. MCPFTG decreased the toxicity of cisplatin and enhanced its antitumor activity. In addition, lyophilized paracrine BMSC factors present in MCPFTG accelerated wound healing after tumor removal. Thus, the present study suggests novel opportunities for the development of a multifunctional drug delivery system for the treatment of squamous cell carcinoma.
ABSTRACT
We present a case of Kaposi's sarcoma (KS) of the heart in a 45-year-old non-immunodeficient woman with symptoms of pericardial effusion and cardiac tamponade. Computed Tomography (CT) coronary angiography and transesophageal echocardiography (TEE) showed a low-density tumorous mass (50 mm diameter) at the level of auricle of the right atrium spreading towards the superior vena cava, floating in the cavity of the right atrium. On histological examination, the tumor consisted of fibrovascular connective tissue with areas of necrosis and hemorrhage. Fibrous septae contained different sized thin walled capillary type blood vessels and lymphangioma-type vascular spaces. Vascular spaces were surrounded by extravasated erythrocytes, deposits of hemosiderin and sparse lymphoplasmacytoid infiltrates. On the periphery of tissue fragments and around vascular spaces, there was a cellular kaposiform proliferation of the spindled cells. Slit-like spaces between spindle cells contained erythrocytes. Nuclear pleomorphism of the spindled cells was minimal. Few mitotic figures were present. Spindle cells were Vimentin, CD34 and CD31 positive. More than 10 % of spindled cells were Ki67 positive. This characteristic histology and immunohistochemistry is consistent with Kaposi's sarcoma. Patient has no history of other malignancies and no other primary tumor was detected. Patient also was negative for HIV infection. There are only 10 documented cases of primary Kaposi's sarcoma of the heart in non-immunodeficient patients reported in the current medical literature. Our report is the first case in which imaging, histology and immunohistochemistry data are available.
