Proliferative activity of salivary tumor cells

Salivary carcinomas comprise 2-3 % of malignant tumors of the head and neck. The basic method of morphological study in early diagnostics is aspiration puncture with a fine needle (FNAB). Complex histologic structure and great diversity of morphological items complicate cytologic diagnostics of salivary tumors considerably. Immunocytochemical examination must be used to reduce the errors, it enables to reveal neoplastic cells at early stages of malignization. High proliferative activity of tumor cells is one of their biological peculiarities. Accuracy in differential diagnostics between benign and malignant tumors is improved through determination of mitotic index combined with a fine needle aspiration puncture

Intranasal Vaccination with the Recombinant Listeria monocytogenes ΔactA prfA* Mutant Elicits Robust Systemic and Pulmonary Cellular Responses and Secretory Mucosal IgA ▿

We previously showed that recombinant (r) Listeria monocytogenes carrying ΔactA and a selected prfA* mutation (r-Listeria ΔactA prfA*) secreted >100-fold more immunogen in broth culture than wild-type r-Listeria or r-Listeria ΔactA and elicited much greater cellular and humoral immune responses than r-Listeria ΔactA after intravenous vaccination of mice. Here, we conducted comparative studies evaluating vaccine-elicited immune responses in systemic and mucosal sites after intranasal, intravenous, intraperitoneal, or subcutaneous immunization of mice with r-Listeria ΔactA prfA* vaccine candidates. Intranasal vaccination of mice with r-Listeria ΔactA prfA* vaccine candidates elicited a robust gamma interferon-positive (IFN-γ+) cellular response in systemic sites, although intravenous or intraperitoneal immunization was more efficient. Surprisingly, intranasal vaccination elicited an appreciable pulmonary IFN-γ+ cellular response that was nonstatistically higher than the magnitude induced by the intravenous route but was significantly greater than that elicited by subcutaneous immunization. Furthermore, although intranasal r-Listeria ΔactA prfA* delivery induced poor systemic IgG responses, intranasal vaccination elicited appreciable secretory immunogen-specific IgA titers that were similar to or higher in mucosal fluid than those induced by subcutaneous and intravenous immunizations. Thus, intranasal vaccination with r-Listeria ΔactA prfA* appears to be a useful approach for eliciting robust systemic and pulmonary cellular responses and measurable secretory mucosal IgA titers