1
|
Semeskandi MN, Mazloom P, Arabzadeh B, Moghadam MN, Ahmadi T. Evaluation of seedling cultivation and irrigation regimes on yield and yield components in rice plant. BRAZ J BIOL 2024; 84:e266261. [DOI: 10.1590/1519-6984.266261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 09/13/2022] [Indexed: 12/23/2022] Open
Abstract
Abstract A split-plot experiment was conducted in a randomized complete block design with three replications in two cropping years at Mazandaran Rice Research Institute to study cultivation and irrigation regimes. The main factor is three-level irrigation regimes, permanent irrigation throughout the day (T1), irrigation two days after water disappears from the soil (T2) and permanent soil saturation (T3) the second factor is three-level cultivation methods., Plowless cultivation (W1), stack 60 cm (W2), and stack 80 cm (W3). Based on the results obtained from the combined analysis, the effect of the year was significant in terms of rainfall, productivity 2, number of tillers, number of empty grains, 1000-grain weight, percentage of the crushed grain, and white rice yield. The effect of the main factor was significant for all traits except productivity 1 and plant height. Based on the results of comparing the mean effect of year × treatment, four treatments, without plowing with permanent irrigation throughout the day in the first and second year of the experiment, cultivation without plowing with irrigation two days after water disappears from the soil in the second year of experiment and cultivation without Plowing with permanent saturated irrigation in the first and second years of the experiment was identified in terms of grain yield as suitable planting methods with appropriate irrigation regimes. Based on the results obtained from the polygon view in different years of the experiment, T3W1, T3W2, and T1W1 treatments can be suggested as desirable treatments in terms of irrigation regimes and cultivation methods in this rice cultivar. According to the ranking diagram of treatments based on traits in the years of experimentation, T1W1, T2W2 and T1W3 were introduced as the most desirable treatments for cultivating this rice cultivar.
Collapse
Affiliation(s)
| | | | - B. Arabzadeh
- Rice Research Institute of Iran Deputy of Mazandaran, Iran
| | | | - T. Ahmadi
- Rice Research Institute of Iran Deputy of Mazandaran, Iran
| |
Collapse
|
2
|
Semeskandi MN, Mazloom P, Arabzadeh B, Moghadam MN, Ahmadi T. Application of correlation coefficients and principal components analysis in stability of quantitative and qualitative traits on rice improvement cultivation. BRAZ J BIOL 2023; 84:e268981. [PMID: 36921192 DOI: 10.1590/1519-6984.268981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 11/07/2022] [Indexed: 03/12/2023] Open
Abstract
In order to investigate the stability of qualitative and quantitative traits and choose the most appropriate cultivation method and irrigation regime in rice plants, the experiment was conducted in the form of a split-plot design based on a randomized complete block design in three replications and in two cropping years. The results of compound analysis indicated that the effect of year × irrigation regimes in terms of traits, grain yield, rainfall, productivity 2, number of full grains, number of hollow grains, harvest index, percentage of crushed grains and yield of white rice, the effect of year × Cultivation method characteristics in terms of water consumption, rainfall, productivity 1, number of tillers, plant height, spike length, number of hollow grains, thousand seed weight, small grain percentage and white rice yield and the effect of irrigation regime × cultivation methods in terms of all Traits except traits productivity 2 were significant. The results of the mean comparison of the interaction effect of irrigation regimes and cultivation methods also showed that treatments T1W1, T2W1 and T1W3 are favorable for all evaluated traits. Based on the table of correlation coefficients, correlation diagram and map of the intensity of the correlation in the years of the experiment, it is possible to report the correlation of the grain yield trait with the traits of water consumption, rainfall, plant height, 100- seed weight, full grain number and white rice yield. Also, traits productivity 1, productivity 2 and small grain percentage showed a positive correlation and a negative correlation of these three traits with most of the traits evaluated in the experiment was observed. Based on the analysis of the main components, the first four main components explained the most data variance, and T2W2 and T2W3 treatments were identified as suitable treatments for rice cultivation in terms of the first and second main components.
Collapse
Affiliation(s)
- M Nikzad Semeskandi
- Department of Agronomy, Chalus Branch, Islamic Azad University, Chalus, Iran
| | - P Mazloom
- Department of Agronomy, Chalus Branch, Islamic Azad University, Chalus, Iran
| | - B Arabzadeh
- Rice Research Institute of Iran Deputy of Mazandaran, Mazandaran, Iran
| | - M N Moghadam
- Department of Agronomy, Chalus Branch, Islamic Azad University, Chalus, Iran
| | - T Ahmadi
- Department of Agronomy, Chalus Branch, Islamic Azad University, Chalus, Iran
| |
Collapse
|
3
|
Melero I, Grande Pulido E, De Miguel Luken M, Johnson M, Bauman J, Moreno Garcia V, Walter A, Adams H, Türeci Ö, Russo G, Sahin U, Steinberg J, Ahmadi T, Felip E. 175P Safety and preliminary efficacy of GEN1042 (DuoBody-CD40x4-1BB) combination therapy in patients with advanced solid tumors. Immuno-Oncology and Technology 2022. [DOI: 10.1016/j.iotech.2022.100287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
4
|
Chiu CW, Hiemstra IH, ten Hagen W, Snijdewint‐Nkairi R, de Jong B, Garrido Castro P, Kweekel C, Oliveri RS, Elliot B, Wielgos‐Bonvallet M, Szafer‐Glusman E, Schuurhuis D, Blaedel J, Ahmadi T, Breij E, Sasser A, Jure‐Kunkel M. PRECLINICAL EVALUATION OF EPCORITAMAB COMBINED WITH STANDARD OF CARE AGENTS FOR THE TREATMENT OF B‐CELL LYMPHOMAS. Hematol Oncol 2021. [DOI: 10.1002/hon.78_2881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- C. W. Chiu
- Genmab US, Inc. Translational Research Plainsboro New Jersey USA
| | | | - W. ten Hagen
- Genmab B.V. Translational Research Utrecht Netherlands
| | | | - B. de Jong
- Genmab B.V. Translational Research Utrecht Netherlands
| | | | - C. Kweekel
- Genmab B.V. Translational Research Utrecht Netherlands
| | | | - B. Elliot
- Genmab US, Inc. Oncology Plainsboro USA
| | | | | | - D. Schuurhuis
- Genmab B.V. Translational Research Utrecht Netherlands
| | | | - T. Ahmadi
- Genmab US, Inc. Oncology Plainsboro USA
| | - E. Breij
- Genmab B.V. Translational Research Utrecht Netherlands
| | - A.K. Sasser
- Genmab US, Inc. Translational Research Plainsboro New Jersey USA
| | - M. Jure‐Kunkel
- Genmab US, Inc. Translational Research Plainsboro New Jersey USA
| |
Collapse
|
5
|
Xu XS, Yan X, Puchalski T, Lonial S, Lokhorst HM, Voorhees PM, Plesner T, Liu K, Khan I, Jansson R, Ahmadi T, Ruixo JJP, Zhou H, Clemens PL. Clinical Implications of Complex Pharmacokinetics for Daratumumab Dose Regimen in Patients With Relapsed/Refractory Multiple Myeloma. Clin Pharmacol Ther 2017; 101:721-724. [PMID: 27859027 PMCID: PMC5485722 DOI: 10.1002/cpt.577] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 11/11/2016] [Accepted: 11/12/2016] [Indexed: 01/28/2023]
Abstract
New therapeutic strategies are urgently needed to improve clinical outcomes in patients with multiple myeloma (MM). Daratumumab is a first-in-class, CD38 human immunoglobulin G1κ monoclonal antibody approved for treatment of relapsed or refractory MM. Identification of an appropriate dose regimen for daratumumab is challenging due to its target-mediated drug disposition, leading to time- and concentration-dependent pharmacokinetics. We describe a thorough evaluation of the recommended dose regimen for daratumumab in patients with relapsed or refractory MM.
Collapse
Affiliation(s)
- XS Xu
- Janssen Research & Development, LLCRaritanNew JerseyUSA
| | - X Yan
- Janssen Research & Development, LLCRaritanNew JerseyUSA
| | - T Puchalski
- Janssen Research & Development, LLCSpring HousePennsylvaniaUSA
| | - S Lonial
- Department of Hematology and Medical Oncology, Winship Cancer InstituteEmory UniversityAtlantaGeorgiaUSA
| | - HM Lokhorst
- VU University Medical CenterAmsterdamThe Netherlands
| | - PM Voorhees
- Division of Hematology/Oncology, Lineberger Comprehensive Cancer CenterUniversity of North Carolina at Chapel HillChapel HillNorth CarolinaUSA
| | - T Plesner
- Vejle Hospital and University of Southern DenmarkVejleDenmark
| | - K Liu
- Janssen Research & Development, LLCRaritanNew JerseyUSA
| | - I Khan
- Janssen Research & Development, LLCRaritanNew JerseyUSA
| | - R Jansson
- Janssen Research & Development, LLCSpring HousePennsylvaniaUSA
| | - T Ahmadi
- Janssen Research & Development, LLCSpring HousePennsylvaniaUSA
| | | | - H Zhou
- Janssen Research & Development, LLCSpring HousePennsylvaniaUSA
| | - PL Clemens
- Janssen Research & Development, LLCSpring HousePennsylvaniaUSA
| |
Collapse
|
6
|
Kheradmandfard M, Fathi M, Ansari F, Ahmadi T. Effect of Mg content on the bioactivity and biocompatibility of Mg-substituted fluorapatite nanopowders fabricated via mechanical activation. Materials Science and Engineering: C 2016; 68:136-142. [DOI: 10.1016/j.msec.2016.05.043] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 04/18/2016] [Accepted: 05/12/2016] [Indexed: 11/28/2022]
|
7
|
Weisel K, Palumbo A, Chanan-Khan A, Nooka A, Spicka I, Masszi T, Beksac M, Hungria V, Munder M, Mateos MV, Mark T, Spencer A, Qi M, Schecter J, Amin H, Qin X, Deraedt W, Ahmadi T, Sonneveld P. Phase 3 randomised study of daratumumab, bortezomib and dexamethasone (DVd) vs bortezomib and dexamethasone (Vd) in patients (pts) with relapsed or refractory multiple myeloma (RRMM): CASTOR. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw375.01] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
8
|
Shafiei Amiri M, Ahmadi T. P-332 - Comparative study of child-reading (training) methods in discrete and indiscrete families and prevention from risky behaviors and psychological damage in adolescents. Eur Psychiatry 2012. [DOI: 10.1016/s0924-9338(12)74499-1] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
9
|
Noorizadeh H, Sobhan-Ardakani S, Raoofi F, Noorizadeh M, Mortazavi SS, Ahmadi T, Pournajafi K. Application of artificial neural network to predict the retention time of drug metabolites in two-dimensional liquid chromatography. Drug Test Anal 2011; 5:315-9. [PMID: 22012704 DOI: 10.1002/dta.325] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Revised: 06/12/2011] [Accepted: 06/13/2011] [Indexed: 11/09/2022]
Abstract
Genetic algorithm and partial least square (GA-PLS) and Levenberg-Marquardt artificial neural network (L-M ANN) techniques were used to investigate the correlation between retention time and descriptors for drug metabolites which obtained by two-dimensional liquid chromatography. The applied internal (leave-group-out cross validation (LGO-CV)) and external (test set) validation methods were used for the predictive power of four models. Both methods resulted in accurate prediction whereas more accurate results were obtained by L-M ANN model. The best model obtained from L-M ANN showed a good R(2) value (determination coefficient between observed and predicted values) for all compounds, which was superior to GA-PLS models.
Collapse
Affiliation(s)
- H Noorizadeh
- Department of Chemistry, Ilam Branch, Islamic Azad University, Ilam, Iran.
| | | | | | | | | | | | | |
Collapse
|
10
|
Aqui N, Gordon A, Xu Y, Chong EA, Leinbach L, Ahmadi T, Nasta S, Svoboda J, Schuster SJ. Differences in regulatory T cells (Tregs) in responding and non-responding patients with indolent B-cell or mantle cell lymphoma during treatment with lenalidomide and rituximab ± dexamethasone. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.8060] [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: 11/20/2022] Open
|
11
|
Noorizadeh H, Sobhan Ardakani S, Ahmadi T, Mortazavi SS, Noorizadeh M. Application of genetic algorithm-kernel partial least square as a novel non-linear feature selection method: partitioning of drug molecules. Drug Test Anal 2011; 5:89-95. [DOI: 10.1002/dta.275] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2011] [Revised: 02/02/2011] [Accepted: 02/02/2011] [Indexed: 11/12/2022]
|
12
|
Aqui N, Leinbach L, Chong EA, Ahmadi T, Svoboda J, Gordon A, Downs LH, Nasta S, Schuster SJ. Changes in regulatory T-cells in responding and non-responding patients with indolent B-cell or mantle cell lymphomas during treatment with lenalidomide, dexamethasone, and rituximab. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.8085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
13
|
Shafiei Amiri M, Homayouni A, Ahmadi T. PW01-245 - Comparative study of psychological health, probability of self-suicide risk and probability of drugs addition in university students. Eur Psychiatry 2010. [DOI: 10.1016/s0924-9338(10)71652-7] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
14
|
Fazeli F, Gooran S, Naghavi A, Ahmadi T. UP-3.048: The Evaluation of Use of International Prostatic Symptom Score (IPSS) in Post-General Anesthesia Urinary Retention in Cataract Surgery in Men Over 50 Years Old. Urology 2009. [DOI: 10.1016/j.urology.2009.07.051] [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: 12/01/2022]
|
15
|
Re D, Wickenhauser C, Ahmadi T, Buchdunger E, Kochanek M, Diehl V, Wolf J. Preclinical evaluation of the antiproliferative potential of STI571 in Hodgkin's disease. Br J Cancer 2002; 86:1333-5. [PMID: 11953894 PMCID: PMC2375346 DOI: 10.1038/sj.bjc.6600243] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2001] [Revised: 02/18/2002] [Accepted: 02/20/2002] [Indexed: 11/09/2022] Open
Abstract
STI571 is a selective tyrosine kinase inhibitor with proven therapeutic potential in malignancies expressing c-kit. A strong c-kit and stem cell factor expression was detected in the Hodgkin and Reed Sternberg cell line L1236, but not in 20 primary cases of classical Hodgkin's disease. Proliferation of L1236 cells was neither affected by addition of stem cell factor nor by neutralising anti-stem cell factor antibodies or STI571. Results suggest that patients with Hodgkin's disease may not benefit from therapy with STI571.
Collapse
Affiliation(s)
- D Re
- Department of Internal Medicine I, University of Cologne, Joseph-Stelzmann-Strasse 9, 50931 Cologne, Germany
| | | | | | | | | | | | | |
Collapse
|
16
|
Kube D, Holtick U, Vockerodt M, Ahmadi T, Haier B, Behrmann I, Heinrich PC, Diehl V, Tesch H. STAT3 is constitutively activated in Hodgkin cell lines. Blood 2001; 98:762-70. [PMID: 11468177 DOI: 10.1182/blood.v98.3.762] [Citation(s) in RCA: 161] [Impact Index Per Article: 7.0] [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: 11/20/2022] Open
Abstract
Hodgkin disease (HD) represents a malignant lymphoma in which the putative malignant Hodgkin and Reed-Sternberg cells are rare and surrounded by abundant reactive nonmalignant cells. It has been suggested that cytokines such as interleukin-6 (IL-6) are involved in the pathogenesis of the disease. The expression of the IL-6 receptor (IL-6R) complex and its link to the activation of signal transducers and activators of transcription (STAT) molecules in HD cell lines was investigated. Gel retardation and Western blot analyses revealed a high level of constitutively activated STAT3 in 5 of 7 HD cell lines, which could not be detected in Burkitt lymphoma cell lines. Different levels of IL-6R protein were measured in various HD cell lines: L428 and Dev cells were characterized by very low levels of gp80 and gp130, on KMH2 cells only gp130 but no gp80 was detected, whereas L540, L591, HDLM2, and L1236 were positive for both gp80 and gp130, suggesting a possible autocrine stimulation of STAT3. However, a further increase in STAT3 activation on IL-6 or IL-6/soluble IL-6R stimulation was not observed. Neutralizing monoclonal antibodies against IL-6, gp80, gp130, or both receptor subunits did not affect the proliferation or the constitutive activation of STAT molecules in HD cell lines. However, the tyrosine kinase inhibitor AG490 blocked the constitutive activation of STAT3 and inhibited spontaneous growth of HD tumor cells. The evidence suggests abnormal STAT signaling and growth regulation in Hodgkin cell lines. (Blood. 2001;98:762-770)
Collapse
Affiliation(s)
- D Kube
- Klinik für Innere Medizin I, Zentrum für Molekulare Medizin der Universität Köln, Germany.
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Re D, Müschen M, Ahmadi T, Wickenhauser C, Staratschek-Jox A, Holtick U, Diehl V, Wolf J. Oct-2 and Bob-1 deficiency in Hodgkin and Reed Sternberg cells. Cancer Res 2001; 61:2080-4. [PMID: 11280769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Hodgkin and Reed Sternberg (H-RS) cells represent the malignant cells in classical Hodgkin's disease. Although derived from germinal center B cells, they do not express surface immunoglobulin. This has been explained by the presence of crippling mutations within the immunoglobulin genes in numerous cases of Hodgkin's disease. As immunoglobulin gene expression in B cells requires an interaction between octamer sites and the transactivating factors Oct-2 and Bob-1, this study addresses the expression of the transcription factors Oct-2 and Bob-1 in H-RS cells. In Hodgkin's disease-derived cell lines, low levels of Oct-2 transcripts but no Oct-2 protein were detected. Transcripts of Bob-1, a B-cell-specific co-factor of Oct-2, could not be observed in these cell lines. Absence of Oct-2 and Bob-1 protein expression in primary H-RS cells was demonstrated by performing immunohistochemistry in 20 cases of classical Hodgkin's disease. H-RS cells stained negative for both proteins in all of the cases analyzed. In conclusion, absence of functional Oct-2 and Bob-1 cells represents a novel mechanism for immunoglobulin gene deregulation in H-RS cells. Lack of Oct-2 and Bob-1 points to a defect in transcription machinery in H-RS cells and is associated with lack of immunoglobulin gene expression in these cells.
Collapse
Affiliation(s)
- D Re
- Department of Internal Medicine I, University of Cologne, Germany
| | | | | | | | | | | | | | | |
Collapse
|
18
|
Onaya H, Itai Y, Ahmadi T, Yoshioka H, Okumura T, Akine Y, Tsuji H, Tsujii H. Recurrent hepatocellular carcinoma versus radiation-induced hepatic injury: differential diagnosis with MR imaging. Magn Reson Imaging 2001; 19:41-6. [PMID: 11295345 DOI: 10.1016/s0730-725x(01)00218-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [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 objective of this study was to assess the value of MR imaging in the differentiation between a recurrent hepatocellular carcinoma (HCC) and a radiation-induced hepatic injury. Nine male patients with suspected recurrence after radiotherapy for HCC underwent T(2)-, T(1)-weighted imaging and Gd-DTPA enhanced dynamic studies. T(2) relaxation times, signal intensity ratios in T(1)-weighted images (WI) and the relative enhancement of the dynamic study were calculated. Recurrent tumors and the irradiated area showed similar image characteristics: hypointense in T(1)-WI and hyperintense in T(2)-WI. T(2) values and signal intensity ratios in the T(1)-WI were not significantly different. In the gadolinium-enhanced dynamic study, a recurrent HCC showed early enhancement, followed by a rapid washout. However, the irradiated liver parenchyma showed hyperintensity from an early phase, and contrast enhancement tended to be more prominent and prolonged at the end of the dynamic studies. The characteristic findings of the dynamic MR study enable us to distinguish between a recurrent HCC and a radiation-induced hepatic injury.
Collapse
Affiliation(s)
- H Onaya
- Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, Tennodai, Tsukuba, Ibaraki 305-8575, Japan.
| | | | | | | | | | | | | | | |
Collapse
|
19
|
Onaya H, Itai Y, Yoshioka H, Ahmadi T, Niitsu M, Okumura T, Akine Y, Matsuzaki Y, Doi M, Tsuji H, Tsujii H. Changes in the liver parenchyma after proton beam radiotherapy: evaluation with MR imaging. Magn Reson Imaging 2000; 18:707-14. [PMID: 10930780 DOI: 10.1016/s0730-725x(00)00152-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [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: 10/18/2022]
Abstract
The objective of this study was to describe magnetic resonance (MR) findings with a 1.5T imager for hepatic parenchymal changes after proton beam radiotherapy. Thirty-two patients who received proton radiotherapy with doses of 50-87 Gy underwent MR imaging 1-75 months (mean 22 months) after the start of irradiation. Axial T(2), T(1)-weighted imaging, and a dynamic study after a gadolinium injection were performed. The irradiated areas showed hypointense in T(1)-weighted images, hyperintense in T(2)-weighted images, and intense and prolonged enhancement on the dynamic study (maximum relative enhancement 441.8%+/-263.3 vs. surrounding liver 145.6%+/-67.7, p<0.0001). T(2) values of the irradiated areas were 50.6 to 65.8 msec greater than in the surrounding liver (p<0.005). The values increased with time, being significantly greater 13 months or longer after the beginning of the therapy than after a period of less than 3 months (p<0.05). Pathologic examinations (n = 3) indicated that the irradiated areas were composed of collapsed lobules with hepatic small vein occlusions, and rich extracellular matrices which retained extracellular fluid. MR imaging can demonstrate hepatic parenchymal changes after proton beam radiotherapy, and show the changes are irreversible.
Collapse
Affiliation(s)
- H Onaya
- Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, Tennodai, 305-8575, Tsukuba, Ibaraki, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Mori H, Yoshioka H, Ahmadi T, Saida Y, Ohara K, Itai Y. Early radiation effects on the liver demonstrated on superparamegnetic iron oxide-enhanced T1-weighted MRI. J Comput Assist Tomogr 2000; 24:648-51. [PMID: 10966203 DOI: 10.1097/00004728-200007000-00025] [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: 11/26/2022]
Abstract
Early radiation-induced liver injury during radiotherapy detected by a particulate reticuloendothelial MR contrast agent (superparamagnetic iron oxide; SPIO) is described in a patient with cholangiocarcinoma. The irradiated hepatic parenchyma appeared as a heterogeneous, less decreased signal intensity area than the nonirradiated area on MR images after SPIO administration. Resultant differences in signal intensity were better visualized on SPIO-enhanced T1-weighted images than SPIO-enhanced T2-weighted images, although SPIO-enhanced T2*-weighted fast field echo imaging was the most sensitive.
Collapse
Affiliation(s)
- H Mori
- Department of Radiology, University of Tsukuba Hospital, Ibaraki, Japan.
| | | | | | | | | | | |
Collapse
|
21
|
Ahmadi T, Itai Y, Onaya H, Yoshioka H, Okumura T, Akine Y. CT evaluation of hepatic injury following proton beam irradiation: appearance, enhancement, and 3D size reduction pattern. J Comput Assist Tomogr 1999; 23:655-63. [PMID: 10524841 DOI: 10.1097/00004728-199909000-00002] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [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: 11/25/2022]
Abstract
PURPOSE The purpose of this study was to investigate the long-term imaging appearances of hepatic injury following proton beam irradiation. The time-attenuation curves, time of appearance and recovery, and 3D size reduction pattern are described in patients of different ages and genders with different irradiation doses, irradiated portals, and Child groups. METHOD Forty-six patients with hepatocellular carcinoma underwent 50 to 84 Gy proton beam irradiation in periods of 14-52 days. CT including noncontrast and dynamic study was performed every 3 months starting 3 weeks after the end of irradiation. The 3D volume measurement of areas of radiation-induced hepatic injury was performed through incremental dynamic CT images in every follow-up study. CT follow-up study of the patients was done for 12-76 months. RESULTS Radiation-induced hepatic injury was observed as low attenuation areas on noncontrast CT and enhanced areas on dynamic study in the regions corresponding to the irradiation portals. Of our cases, 67.5% showed the appearance of radiation hepatitis in 3-4 weeks and 95.3% in 3-4 months after the end of irradiation. In both periods, there was a significant delay in the female patients. The time-attenuation curve showed an early and prolonged enhancement of the irradiated regions. The volume reduction pattern of the injured areas was found to be longstanding, exponential, and directed from periphery to the center. CONCLUSION Early appearance of radiation-induced hepatic injury was found only to be gender dependent, with a tendency to occur with higher irradiated doses; no other parameters affected this phenomenon in our cases. Disappearance of the injured areas, if present, takes a long time (at least 42 months).
Collapse
Affiliation(s)
- T Ahmadi
- Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, Japan
| | | | | | | | | | | |
Collapse
|
22
|
Ahmadi T, Okumura T, Onaya H, Akine Y, Itai Y. Preservation of hypervascularity in hepatocellular carcinoma after effective proton-beam radiotherapy--CT observation. Clin Radiol 1999; 54:253-6. [PMID: 10210346 DOI: 10.1016/s0009-9260(99)91161-3] [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: 11/23/2022]
Abstract
AIM The aim of this study was to describe persistence of hypervascularity in proton treated hepatocellular carcinoma at serial follow-up computed tomography (CT). METHODS Four patients with unresectable solitary hypervascular hepatocellular carcinoma underwent 55-82 Gy proton-beam irradiation for a period of 15-47 days. Follow-up CT including plain, enhanced and dynamic imaging was performed for a period of 9-36 months. RESULTS Good preservation of arterial blood supply while gradual decrease in tumour size was clearly depicted by dynamic CT. CONCLUSION We believe that preservation of hypervascularity as judged by enhancement at CT and magnetic resonance imaging, does not necessarily mean that radiotherapy in hypervascular malignant tumours has been unsuccessful.
Collapse
Affiliation(s)
- T Ahmadi
- Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, Japan
| | | | | | | | | |
Collapse
|
23
|
Ahmadi T, Itai Y, Takahashi M, Onaya H, Kobayashi T, Tanaka YO, Matsuzaki Y, Tanaka N, Okada Y. Angiomyolipoma of the liver: significance of CT and MR dynamic study. Abdom Imaging 1998; 23:520-6. [PMID: 9841067 DOI: 10.1007/s002619900391] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Angiomyolipoma is a benign mesenchymal tumor that has been reported frequently in the kidney but rarely in the liver. In the present study, we present four cases of hepatic angiomyolipoma with different radiologic appearances, discuss differential diagnosis, and review previously reported cases. One of our cases was followed for 8 years. Computed tomography (plain, enhanced, and dynamic study), magnetic resonance imaging (T1-weighted spin echo, T2-weighted spin echo, and dynamic study), ultrasonography, and angiography were performed in all cases. Although different radiologic appearances were observed in the tumors, based on different proportions of fat, blood vessels, and muscle, three cases were diagnosed as angiomyolipoma. In one case, it was quite difficult to make radiologic diagnosis; hepatocellular carcinoma with fatty metamorphosis in part was most likely suspected, but histopathological examination revealed angiomyolipoma with few fat elements. In the present study, early and prolonged enhancement of the lesion with the special pattern of time density/intensity curve was significant for angiomyolipoma, and we suggest that preoperative radiologic diagnosis of the lesion is possible in most of the cases. However, it can be quite difficult to distinguish angiomyolipoma from some hepatocellular carcinomas with fatty metamorphosis.
Collapse
Affiliation(s)
- T Ahmadi
- Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Ahmadi T, Itai Y, Minami M. Central dot sign in entities other than Caroli disease. Radiat Med 1997; 15:381-4. [PMID: 9495788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE The purpose of this study was to describe central dot sign (tiny dots with strong contrast enhancement of the portal vein within dilated hepatic bile ducts on computed tomography) in entities other than Caroli disease, especially in peribiliary cysts with or without autosomal-dominant polycystic kidney disease. MATERIALS AND METHODS Computed tomography in 74 cases of peribiliary cysts and 134 cases of other liver diseases and states possibly showing central dot sign were retrospectively reviewed to examine the central dot sign. RESULTS In three cases of peribiliary cysts, some part of the liver showed strongly enhanced portal radicles surrounded completely or partially by low-attenuation, enlarged peribiliary cysts, presenting "central dot sign" on contrast-enhanced computed tomography. CONCLUSION We suggest that in addition to Caroli disease, some other entities and diseases of the liver may demonstrate central dot sign and this sign should not be considered a specific finding of Caroli disease.
Collapse
Affiliation(s)
- T Ahmadi
- Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
| | | | | |
Collapse
|
25
|
Ahmadi T, Itai Y, Onaya H, Eguchi N, Ebihara R. Hepatic peribiliary cysts: increases in size and number on computed tomography. Radiat Med 1997; 15:255-257. [PMID: 9311045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We report a 71-year-old male patient with multiple hepatic peribiliary cysts. The six-year follow-up through computed tomography (CT) imaging revealed increases in the size (from less than 10 mm to more than 38 mm) and number of the cysts.
Collapse
Affiliation(s)
- T Ahmadi
- Department of Radiology, University of Tsukuba, Ibaraki, Japan
| | | | | | | | | |
Collapse
|
26
|
Abstract
PURPOSE To determine the imaging characteristics of fulminant hepatic failure at serial computed tomography (CT) and to assess if any CT findings have prognostic value. MATERIALS AND METHODS In 40 patients, 207 CT scans were analyzed retrospectively. Thirty-four patients had fulminant hepatic failure (acute in seven and subacute in 27), and six had late-onset hepatic failure. Twenty-one patients died of hepatic failure. CT was performed soon after the onset of coma and repeated weekly. Liver volume was measured by tracing the hepatic contour and summing the areas to estimate whole-liver volume. RESULTS Liver volumes in survivors (n = 19) and nonsurvivors (n = 21), respectively, were 1,090 cm3 +/- 300 and 830 cm3 +/- 240 at initial CT and 1,130 cm3 +/- 310 and 700 cm3 +/- 280 at last CT (P = .0001). III-defined hypoattenuating areas were noted in 20 patients and were distributed in a solitary (n = 13), multiple (n = 6), or diffuse (n = 1) pattern. At follow-up CT, the area of hypoattenuation increased in six patients (five nonsurvivors) and disappeared or markedly decreased in four survivors. An increase in or late occurrence of ascites was noted in 15 patients (14 nonsurvivors, P = .0001). CONCLUSION Liver volumes at the initial and last CT examinations and an increase in or late occurrence of ascites are useful prognostic findings.
Collapse
Affiliation(s)
- Y Itai
- Department of Radiology, University of Tsukuba, Japan
| | | | | | | | | |
Collapse
|