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PubMedDate not supplied

Biological activity of bacterial lectins and their molecular complexes with heterocyclic bis-adducts.

A new convenient method for the preparation of heterocyclic bis-adducts: of imidazole, benzimidazole, uracile with 1,1,1-trifluoro-2-bromo-2-chloroethane is described. The reactions are catalysed by the 18-crown-6-complex. The critical toxicity and antitumour activity of saprophytic strains Bacillus genus (B. subtilis 668 IMV and B. polymyxa 102 KSU) extracellular lectins were studies. It was discovered that these substances apply to a few toxic preparations and have a expression antitumour action on the tumours: Walker carcinosarcoma 256, Pliss' lymphosarcoma and Sarcoma 45. The new molecular complexes were created with bacterial lectins and the same heterocyclic-bis-adducts of unsubstituted benzimidazole and 6-methyluracile. A strongly antitumour effect of these complexes has been discovered: of growth relaxation of Pliss' lymphosarcoma tumour mass was 62.5-82.01%.

Animals↗
PubMed1986

[Antitumor activity of doxorubicin in respect to solid tumors in mice].

Antitumor activity of doxorubicin, an antibiotic prepared in the USSR was studied with respect to 4 solid tumors of mice: lymphosarcoma LIO-1, sarcoma 180, pregastric cancer OZh5 and melanoma B-16. Doxorubicin showed high antitumor activity against lymphosarcoma and sarcoma 180. However, it was somewhat lower than that of rubomycin and carminomycin. By selective antitumor activity against mouse pregastric cancer doxorubicin was superior to rubomycin and carminomycin. Estimation of antitumor activity of doxorubicin revealed its advantages in inhibition of melanoma B-16 growth, while carminomycin was superior in prolonging the animal life-span.

Animals↗
PubMed1984

[Sarcoma of the bladder in adults].

The authors report five cases of sarcoma of the bladder and make a distinction between homotypical and heterotypical sarcomas and lymphosarcomas presenting specific therapeutical problems. The prognosis is severe because of very frequent local relapse. They recommend disregard of the invasion of the muscular wall, and the performance of total cystectomy following a positive histological diagnosis. In their view, this is the basis for the treatment of sarcomas.

Aged↗
PubMed1975

[On the individualized, combined therapy of Ewing's sarcoma (author's transl)].

With eleven patients, for whom in the period 1967-74 a diagnosis of Ewing's sarcoma was confirmed, it was shown how by intensifying the chemo- and radiotherapy the survival time of some patients could be prolonged. At the same time surgical therapy has become less important. The diagnostical difficulties of the histomorphological differentiation of Ewing's sarcoma from lymphosarcoma are detailed on the example of another patient. A further general intensification of the chemo- and radiotherapy is not possible as the organism's limit of acute tolerance is already reached. Any future improvement on the results of treatment seems therefore only possible if combination therapy is modified to correspond to the particular needs of the individual patient.

Adolescent↗
PubMed1985

Evaluation of [1-11C]-alpha-aminoisobutyric acid for tumor detection and amino acid transport measurement: spontaneous canine tumor studies.

Alpha-aminoisobutyric acid (AIB), or alpha-methyl alanine, is a nonmetabolized amino acid transported into cells, particularly malignant cells, predominantly by the 'A' amino acid transport system. Since it is not metabolized, [1-11C]-AIB can be used to quantify A-type amino acid transport into cells using a relatively simple compartmental model and quantitative imaging procedures (e.g. positron tomography). The tissue distribution of [1-11C]-AIB was determined in six dogs bearing spontaneous tumors, including lymphosarcoma, osteogenic sarcoma, mammary carcinoma, and adenocarcinoma. Quantitative imaging with tissue radioassay confirmation at necropsy showed poor to excellent tumor localization. However, in all cases the concentrations achieved appear adequate for amino acid transport measurement at known tumor locations. The observed low normal brain (due to blood-brain barrier exclusion) and high (relative to brain) tumor concentrations of [1-11C]-AIB suggest that this agent may prove effective for the early detection of human brain tumors.

Amino Acids↗