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Gazina V, Polikarpova S, Timofeeva O, Pivkina N, Bondarenko N, Vechorko V. P125 Determination of MIC of tobramycin for inhalation use against strains of Pseudomonas aeruginosa in patients with cystic fibrosis. J Cyst Fibros 2020. [DOI: 10.1016/s1569-1993(20)30460-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Janowski E, Timofeeva O, Chasovskikh S, Goldberg M, Kim A, Banovac F, Pang D, Dritschilo A, Unger K. Yttrium-90 radioembolization for colorectal cancer liver metastases in KRAS wild-type and mutant patients: Clinical and ccfDNA studies. Oncol Rep 2016; 37:57-65. [PMID: 28004119 PMCID: PMC5355723 DOI: 10.3892/or.2016.5284] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 10/18/2016] [Indexed: 12/22/2022] Open
Abstract
Patients with unresectable, chemo-refractory colorectal cancer liver metastases (CRCLM) have limited local treatment options. We report our institutional experience on the efficacy of resin-based yttrium-90 (90Y) radioembolization for the treatment of CRCLM and our findings on associated circulating cell-free DNA (ccfDNA) studies. A total of 58 patients treated with 90Y for CRCLM at the Medstar Georgetown University Hospital had a median survival of 6 months [95% confidence interval (CI), 4.55–7.45 months] after treatment, with a 12-month survival rate of 33%. The median survival from treatment stratified by mutational status was longer in the wild-type (WT) as compared to the KRAS mutant patients at 7 vs. 5 months, but did not achieve statistical significance (p=0.059). Median tumor local control duration after 90Y treatment was 2 months (95% CI, 0.34–3.66 months) for the entire cohort and was longer in the WT vs. the mutant patients (2 vs. 1 month, respectively, p=0.088). Plasma was prospectively collected from a subset of 9 patients both before and after single lobe treatment, and ccfDNA concentration and fragmentation index (FI) were measured using quantitative PCR and atomic-force microscopy (AFM). In the WT and KRAS mutant patients, DNA FI was reduced from a median of 0.73–0.65 after treatment. A reduction in DNA FI after single lobe treatment was associated with an improved overall survival (p=0.046). Analysis by AFM of paired pre- and post-treatment samples from KRAS mutant and WT patients revealed a larger average decrease in fragment size in the WT patients (p=0.013). 90Y radioembolization extends local control for CRCLM, however, KRAS mutant tumors may be more radio-resistant to treatment. Changes in the FI of patients following treatment were noted and may be evaluated in a larger study for relevance as a biomarker of response.
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Affiliation(s)
- E Janowski
- Department of Radiation Medicine, Georgetown University Hospital, Washington, DC, USA
| | - O Timofeeva
- Department of Oncology, Georgetown University, Washington, DC, USA
| | - S Chasovskikh
- Department of Oncology, Georgetown University, Washington, DC, USA
| | - M Goldberg
- Department of Oncology, Georgetown University, Washington, DC, USA
| | - A Kim
- Department of Interventional Radiology, Georgetown University Hospital, Washington, DC, USA
| | - F Banovac
- Department of Interventional Radiology, Vanderbilt University Hospital, Nashville, TN, USA
| | - D Pang
- Department of Radiation Medicine, Georgetown University Hospital, Washington, DC, USA
| | - A Dritschilo
- Department of Radiation Medicine, Georgetown University Hospital, Washington, DC, USA
| | - K Unger
- Department of Radiation Medicine, Georgetown University Hospital, Washington, DC, USA
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Pigaga A, Timofeeva O. Quantitative Representation of Tananaev's Effect. RUSS J APPL CHEM+ 2004. [DOI: 10.1023/b:rjac.0000044175.11636.a2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Timofeeva O, Khokhlova L, Belyaeva N, Chulkova Y, Garaeva L. Cytoskeleton-induced alterations of the lectin activity in winter wheat under cold hardening and abscisic acid (ABA). Cell Biol Int 2000; 24:375-81. [PMID: 10860573 DOI: 10.1006/cbir.1999.0520] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The roots and leaves of 7-day seedlings of three winter wheat cultivars differing in frost resistant were used to study changes in lectin activity under cytoskeleton modifiers (DMSO-7%; colchicine-1 m m; oryzalin-15 microm; cytochalasin B-15 microm) of non-hardened (23 degrees C) and hardened (2-3 degrees C, 3-7 day) plants. Plants were grown with ABA (30 microm) or without ABA. Pretreatment with colchicine, oryzalin [inhibitors of microtubules (MT) polymerization], cytochalasin B [inhibitor of microfilament (MF) polymerization] increased the activity of cell wall lectins, although pretreatment with DMSO (stabilizer of microtubules) decreased the activity. Both hardening and ABA decreased the effect of the cytoskeletal modifiers. These results could be explained by the appearance of tolerant MTs with less affinity. It is probable that increase in the activity of cell wall lectins may be the compensatory mechanism which stabilizes the cytoskeleton structure in conditions tending to disrupt it. The genotype with low resistance had higher sensitivity of lectin activity to cytoskeleton modifiers than the frost resistant genotype. The results suggest that leaves have more stable MTs and MFs and stronger MT-MF binding than roots.
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Affiliation(s)
- O Timofeeva
- Department of Plant Physiology, University of Kazan, Russia.
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Tretyakova S, Bonetti R, Golovchenko A, Guglielmetti A, Hussonnois M, Ilić R, Kobzev A, Mikheev V, Oglobin A, Poli C, Ponomarenko V, Timofeeva O, Shigin V, Skvarč J. Use of phosphate glass detectors for study of curium-242 cluster radioactivity. RADIAT MEAS 1999. [DOI: 10.1016/s1350-4487(99)00086-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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