PubMed Health⌕ Search

Biomedical subjects

V A Filov

Publications and source records attributed to V A Filov.

At least 37 records · Page 2Linked to original sources
PubMed1995

Experience of the treatment with Sehydrin (Hydrazine Sulfate, HS) in the advanced cancer patients.

The results of Sehydrin (Hydrazine Sulfate, HS) treatment of 740 patients with the advanced, recurrent or metastatic solid tumours of various localizations or malignant lymphomas, for whom all the methods of specific treatment (surgery, radiation, chemotherapy) had been exhausted are presented in this work. The objective response, symptomatic therapeutic effects and toxicity were estimated. Clinically significant objective responses were registered in patients with the soft tissue sarcomas, including neuroblastomas, and paradoxically--in such semimalignant tumours as desmoids. Although the objective response in patients with the lung cancer (90%--non-small cell) was only 4%, stabilization of long duration was registered in 22% of cases connected with the impressive relief of heavy common symptoms in 38.5% of the treated patients. Such a subjective response was established in 46.6% of all the 740 cases. The drug given per os was well tolerated by patients in primary and subsequent courses and did not induce myelosuppression or other significant side effects. On the basis of observations available, Sehydrin may be assessed as an alternative drug for the treatment and symptomatic therapy of patients with some advanced solid tumours and malignant lymphomas at a disease stage when the other methods of treatment can not be used. A possible mechanism of antitumour and symptomatic action is being discussed.

Adolescent↗
PubMed1994

[Therapy of primary brain tumors with segidrin].

The results of segidrin administration to 46 patients with malignant and 6 patients with benign tumors of the brain are presented. Pronounced therapeutic effect for the whole group was 63.5% and 73%, if partial regression of neurologic symptoms in the entire brain and separate foci is considered. These indexes for patients with malignant tumors only were 61 and 71.7%, respectively. Since segidrin has virtually no significant untoward side-effects, it is considered a most safe medicine for managing brain tumors. It is recommended in cases of inoperable tumor and for post-operative adjuvant chemotherapy with a view to extending the patient's survival time and improving the quality of life.

Adolescent↗
PubMed1994

[Basic and salvage pathways of NAD biosynthesis in organs of normal rats, tumor-bearing rats and in tumors].

The rates of quinolinic and nicotinic acids and nicotinamide utilization for NAD biosynthesis in organs of normal rats and those with lymphosarcoma of Pliss and Walker's carcinosarcoma were studied. All three compounds were shown to be NAD's precursors in the liver and kidneys of normal animals. Quinolinic acid failed to stimulate the increase in NAD concentration in the liver of Walker carcinosarcoma-bearing rats. An insignificant rise in NAD concentration was registered in the liver of rats with lymphosarcoma of Pliss following quinolinic acid treatment. The rates of nicotinic acid and nicotinamide utilization in the liver of tumor-bearing animals were lower than in healthy controls. Quinolinic acid utilization was the most intense in the kidney of rats with Walker's carcinosarcoma while nicotinic acid and nicotinamide were mostly utilized in the kidney of rats with lymphosarcoma of Pliss. None of the three precursors caused NAD concentration to rise in Walker's carcinosarcoma cells whereas nicotinamide injection was followed by an increase in NAD concentration in Pliss lymphosarcoma cells. To summarize, the neoplastic cells under study do not use the basic pathway of NAD biosynthesis and are characterized by different rates of nicotinic acid and nicotinamide utilization.

Animals↗
PubMed1992

Nikolai Vasilyevich Lazarev, toxicologist and pharmacologist, comes in from the cold.

Important and pioneering work on the physicochemical properties underlying the biological activity of nonelectrolytes was performed 'behind the iron curtain' by Soviet scientist Nikolai Vasilyevich Lazarev. In this Special Feature, Robert Lipnick and Vladimir Filov examine the contribution of Lazarev's numerous observations to the knowledge base in pharmacology and toxicology, which has only recently gained recognition in the West.

Chemistry, Pharmaceutical↗
PubMed1992

[An analysis of the connection between the inhibition of NAD biosynthesis and the antitumor activity of drugs].

The study was concerned with a relationship between a decrease in NAD concentration and inhibition of precursor utilization for NAD biosynthesis, on the one hand, and inhibition of Ehrlich ascitic carcinoma growth in response to treatment with embichin, cyclophosphamide, thiophosphamide, adriablastin and methotrexate, on the other. The antitumor effect of drugs was found to be determined by degree of inhibition of precursor utilization for NAD biosynthesis but not by a decrease in NAD level. A relationship between alteration of synchronous induction of NAD and poly (ADP-ribose) biosynthesis rates and reversibility of the antitumor effect of drugs is discussed.

Animals↗
PubMed1990

[The results of a clinical study of the preparation hydrazine sulfate].

The paper discusses results of a cooperative study of effectiveness of hydrazine sulfate therapy in 740 patients with primary advanced, recurrent and metastatic solid tumors and malignant lymphomas who had failed all other treatment modalities. Both objective response and symptomatic effect were assessed. Objective response was observed in neuroblastoma, recurrent desmoid, Hodgkin's disease, lung cancer, fibrosarcoma and other tumors. Since hydrazine sulfate provided relief of a wide spectrum of cancer symptoms, it may be recommended for patients with end-stage cancer.

Adolescent↗
PubMed1989

[Toxicity of para-aminobenzhydrazide and its influence on nucleic acid biosynthesis in cultures of normal and tumor cells].

We have investigated cytotoxic action of p-aminobenzhydrazide and its influence on biosynthesis of nucleic acids in cultures of intact cells, tumor cells and intact cells stimulated by phytohemagglutinin. p-Aminobenzhydrazide is considered as a representative of hydrazine's derivatives (in particular, of hydrazine sulphate). We compare its action with that of a typical cytotoxic agent such as iododeoxyuridine. We have found that p-aminobenzhydrazide influences biosynthesis of nucleic acids in the same way as iododeoxyuridine. However it acts toxically on tumor cells though it is not toxic for intact cells so that its action is different as compared to that of cytotoxic agents. Specific toxic action of aminobenzhydrazide on tumor cells may be due to the enhancement of antitumor activity substances of this compound and absence of such enhancement of side toxic effects.

Aniline Compounds↗
PubMed1986

[Effect of chemotherapy on the nucleoside phosphate kinase activity in experimental tumors].

In animals with experimental transplantable tumors, an effective treatment with antitumor compounds brought about interrelated changes in nucleoside phosphate kinase activity. The decrease in thymidine phosphate kinase activity was as a rule matched by an increase in that of uridine phosphate kinase. Consequently, "thymidine kinase-uridine kinase" shunt responsible for thymidine-uridine interconversion was suggested, which is switched on when the homeostasis of tumor cells is disturbed. In treatment of tumor-bearing animals, the effective dosage of antitumor drugs was considerably decreased due to a combination of the said compounds (inhibiting nucleoside kinases) or with azauridine which inhibits uridine monophosphate synthesis from orotidine-5'-phosphate.

Animals↗
PubMed1985

[Effect of treatments of different modalities on the nucleoside phosphate kinase activity of normal and neoplastic cells].

The activity of nucleoside phosphate kinases was studied in experimental transplantable tumours under chemotherapy, in the liver of normal rats treated with hepatocarcinogens, or in human lung tumours after irradiation. The above factors have been found to increase the activity of uridine phosphate kinase, reducing at the same time the activity of thymidine phosphate kinase. The data suggest the existence of an unknown regulatory mechanism responsible for the normal levels of uridylates and thymidylates, thymidine kinase and uridine kinase shunt.

Animals↗
PubMed1985

[Antitumor activity and pharmacological properties of furizil].

The paper discusses the biological properties of 2-(2-furyl)-5-oxymethyl-5-(2,4-diethyleneimino-1,3,5-triazine- 6-yl) amino-1,3-dioxane (furizil), synthesized by substituting ethyleneimine groups for chlorine atoms in individual stereoisomer of a dichlorotriazine derivative. Furizil was found to inhibit the growth of Ehrlich's tumor, Walker's carcinosarcoma, sarcoma 45 and rat ovarian tumors, the inhibition rate ranging 76-100%. Parenterally administered, LD50 appeared to be 6 mg/kg for rats and 15 mg/kg for mice. Studies of chronic toxicity established damaging effects of furizil on hematopoietic, gastrointestinal and reproductive organs. Toxic effects subsided 1-2 weeks after the drug withdrawal.

Animals↗