1
|
Han JE, Zakeri K, Michel L, Sherman EJ, Lee NY. Rebuttal to comment on "Concurrent carboplatin and paclitaxel definitive radiation therapy for locally advanced head and neck cancer". Head Neck 2024; 46:230-231. [PMID: 37881148 DOI: 10.1002/hed.27560] [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: 10/12/2023] [Accepted: 10/16/2023] [Indexed: 10/27/2023] Open
Abstract
see pages 228‐229
Collapse
Affiliation(s)
- James E Han
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Kaveh Zakeri
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Loren Michel
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Eric J Sherman
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Nancy Y Lee
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| |
Collapse
|
2
|
Han JE, Lozano A, Hasan S, Choi JI, Chhabra AM, Tsai H, Mohammed N, Patel S, Katz S, Chang JH, Simone CB, Press RH. Proton Therapy Outcomes for Head and Neck Cutaneous Melanoma: Proton Collaborative Group Analysis. Int J Part Ther 2022; 9:40-48. [PMID: 36060417 PMCID: PMC9415747 DOI: 10.14338/ijpt-22-00003.1] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 05/12/2022] [Indexed: 11/30/2022] Open
Abstract
Purpose Reports of proton beam therapy (PBT) utilization for cutaneous melanoma of the head and neck (HN) region is virtually non-existent. This study reports on the efficacy and acute toxicities of PBT for primary HN cutaneous melanoma. Materials and Methods We queried the prospectively collected, multi-institutional Proton Collaborative Group registry for all consecutive patients with HN cutaneous melanoma receiving PBT from May 2010 to December 2019. Kaplan-Meier methods were used to estimate overall survival (OS), progression free survival (PFS), and local regional recurrence free survival (LRFS). Toxicity was reported per CTCAE version 4.0. Results A total of 8 patients were identified with a median age of 69 (range, 37-88). All patients (100%) underwent surgery followed with postoperative PBT. There were 3 patients (37.5%) with T3 or T4 disease and 4 (50%) with N2 or N3 disease. The median radiation dose was 46 GyRBE (range, 27-70) and median dose per fraction was 2.4 GyRBE (range, 2.0-6.0) with the most common dose fractionation being 44 or 48 GyRBE in 20 fractions (n = 4). At a median follow-up of 40.1 months (range, 1.6-62.4) the 1 and 3 year OS rates were 85.7% and 35.7%, respectively. The median PFS was 25.40 months (95% CI, 2.53-58.70) while PFS at 1 year and 3 years was 85.7% and 35.7%, respectively. LRFS was 100% at 1 year and 85.7% at 3 years. Five of the 8 patients developed distant metastases, of which 3 received immunotherapy. Acute G2+ and G3+ toxicities occurred in 5 of 8 patients and 2 of 8 patients, respectively. G3 toxicities included radiation dermatitis (n = 1) and immunotherapy-related rash (n = 1). No G4+ toxicities were reported. Conclusion Single modality PBT for HN melanomas in the definitive setting provides effective and durable local control rates with tolerable acute toxicity. Distant failure remains the primary pattern of failure.
Collapse
Affiliation(s)
- James E. Han
- 1 Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - Alicia Lozano
- 1 Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - Shaakir Hasan
- 1 Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - J. Isabelle Choi
- 1 Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - Arpit M. Chhabra
- 1 Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - Henry Tsai
- 2 ProCure Proton Therapy Center, Somerset, NJ, USA
| | - Nasiruddin Mohammed
- 3 Department of Radiation Oncology, Northwestern University, Chicago, IL, USA
| | - Samir Patel
- 4 Department of Radiation Oncology, Mayo Clinic, Scottsdale, AZ, USA
| | - Sanford Katz
- 5 Department of Radiation Oncology, Willis Knighton Medical Center, Shreveport, LA, USA
| | - John H. Chang
- 6 Department of Radiation Oncology, Oklahoma Proton Center, Oklahoma City, OK, USA
| | - Charles B. Simone
- 1 Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - Robert H. Press
- 1 Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| |
Collapse
|
3
|
Han JE, Hasan S, Choi JI, Press RH, Simone CB. Optimal surgical timing and radiotherapy dose for trimodality therapy in locally advanced non-small cell lung cancer. Cancer Med 2021; 10:5794-5808. [PMID: 34350713 PMCID: PMC8419752 DOI: 10.1002/cam4.4123] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 06/13/2021] [Accepted: 06/14/2021] [Indexed: 12/25/2022] Open
Abstract
Purpose/Objectives Data are conflicting on the effects of time interval from neoadjuvant chemoradiation (NCRT) to surgery for locally advanced non‐small‐cell lung cancer (LA‐NSCLC). This study investigated the impact of surgical timing after NCRT and radiation dose on postoperative mortality and overall survival (OS). Materials and Methods Using the National Cancer Database, we identified 3489 LA‐NSCLC patients treated with NCRT and surgery. Multivariate Cox proportional hazards analysis (MVA) was used to examine the effects of surgery >7 weeks from NCRT completion on OS. Propensity score (PS)‐matched survival analysis for surgery ≤7 and >7 weeks was performed. Postoperative mortality was assessed. Results Median OS for surgery ≤7 weeks and >7 weeks after NCRT were 56.9 versus 45.6 months (hazard ratio, HR 1.18 [1.07–1.30]; p < 0.001). Surgery >7 weeks correlated with decreased OS on MVA (HR 1.15 [1.04–1.27]; p = 0.009) and PS matching (HR 1.16 [1.049–1.29]; p = 0.004). Time as a continuous variable correlated with OS on MVA (HR 1.003 [1.001–1.006]; p = 0.0056) and PS matching (HR 1.004 [1.001–1.006]; p = 0.004). Among 2902 lobectomy patients, the mortality rate for surgery ≤66 days was 5.2% versus 8.1% for >66 days (MVA HR 1.59 [1.02–2.49]; p = 0.04). Higher neoadjuvant radiotherapy dose correlated with surgery >7 weeks and lobectomy >66 days on MVA. Conclusions Increased interval >7 weeks from NCRT to surgery for LA‐NSCLC is correlated with worse OS and lobectomy ≤66 days correlated with improved OS. Surgery ≤7weeks may improve tumor control, whereas higher mortality for surgery >66 days may relate to late NCRT manifestations. Neoadjuvant doses of 44–50.4 Gy may minimize risks of radiation‐induced lung injury and surgical complications and facilitate surgery within the optimal 7‐week interval.
Collapse
Affiliation(s)
- James E Han
- Department of Radiation Oncology, University of California Los Angeles, Los Angeles, CA, USA
| | - Shaakir Hasan
- Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - J Isabelle Choi
- Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - Robert H Press
- Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - Charles B Simone
- Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| |
Collapse
|
4
|
Han JE, Chang J, Rosen L, Hartsell W, Tsai H, Chen J, Mishra MV, Krauss D, Isabelle Choi J, Simone CB, Hasan S. Treatment interruptions affect biochemical failure rates in prostate cancer patients treated with proton beam therapy: Report from the multi-institutional proton collaborative group registry. Clin Transl Radiat Oncol 2020; 25:94-101. [PMID: 33204857 PMCID: PMC7649394 DOI: 10.1016/j.ctro.2020.10.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 10/11/2020] [Accepted: 10/12/2020] [Indexed: 12/25/2022] Open
Abstract
INTRODUCTION To date, no studies examining the effect of treatment interruptions (TI) with proton beam therapy (PBT) have been published. The goal of our study was to determine the predictors of TI amongst patients with prostate cancer (PCa) treated with PBT and to determine whether TI are associated with biochemical failure (BF). We hypothesized that any correlation between TI and biochemical control would be more pronounced in high risk groups. METHODS Data for 4278 patients with PCa was obtained from the prospectively collected Proton Collaborative Group (PCG) data registry. Univariate and multivariate logistic regression analysis (MVA) was used to model possible predictors of BF. A subset analysis was performed for high risk patients treated with ADT and PBT. Finally, propensity score (PS) analysis was performed to account for any indication bias caused by lack of randomization. RESULTS Total treatment duration (OR, 1.05 [1.04-1.06]; p < 0.001) increased the likelihood of TI on MVA. TI did not have a statistically significant correlation with BF (OR, 1.44 [0.86-2.39]; p = 0.162) amongst PS matched patients. However, on subset analyses of high risk group patients with PS matching, there was a trend towards worse BF in patients with TI (OR 3.85; 95%CI (0.96-15.44); p = 0.057). CONCLUSION In the first analysis of its kind, the results suggest that TI in high risk PCa patients treated with PBT and ADT have worse BF rates. Interventions such as increased patient education, proper maintenance of proton facilities, and decreasing total treatment duration with alternative fractionation schedules may help avoid the unintended negative effects on tumor control due to TI. However, future analyses on a larger patient population is needed.
Collapse
Affiliation(s)
- James E. Han
- Department of Radiation Oncology, University of California Los Angeles, Los Angeles, CA, USA
| | - John Chang
- Department of Radiation Oncology, Oklahoma Proton Center, Oklahoma City, OK, USA
| | - Lane Rosen
- Department of Radiation Oncology, Willis Knighton Medical Center, Shreveport, LA, USA
| | - William Hartsell
- Department of Radiation Oncology, Northwestern University, Chicago, IL, USA
| | - Henry Tsai
- ProCure Proton Therapy Center, Somerset, NJ, USA
| | - Jonathan Chen
- Department of Radiation Oncology, University of Washington, Seattle, WA, USA
| | - Mark V. Mishra
- Department of Radiation Oncology, University of Maryland School of Medicine, MD, USA
| | - Daniel Krauss
- Department of Radiation Oncology, Beaumont Hospital, Royal Oak, MI, USA
| | - J. Isabelle Choi
- Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - Charles B. Simone
- Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - Shaakir Hasan
- Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| |
Collapse
|
5
|
Han JE, Press RH, Hasan S, Choi JI, Simone II CB. Towards answering the optimal palliative fractionation conundrum: single- versus multi-fraction radiation therapy for spinal cord compression. Ann Palliat Med 2020; 9:1370-1374. [DOI: 10.21037/apm-20-990] [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] [Received: 04/20/2020] [Accepted: 05/08/2020] [Indexed: 11/06/2022]
|
6
|
Han JE, Yi SK, Wang S, Erman A, Bearelly S, Sindhu S, Robbins JR, Bauman J, Hsu CC. Neoadjuvant chemotherapy improves survival compared with concurrent chemoradiation alone in nasopharyngeal carcinoma patients with N3 disease. Head Neck 2019; 41:4076-4087. [PMID: 31520512 DOI: 10.1002/hed.25955] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 06/14/2019] [Accepted: 08/26/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Neoadjuvant chemotherapy (NAC) trials in endemic regions of nasopharyngeal carcinoma (NPC) found improved survival, but studies are lacking in nonendemic regions. We assessed whether adding NAC to concurrent chemoradiation (CRT) improves overall survival (OS), especially in high-risk nonendemic patients. METHODS Definitively treated NPC patients (n = 5424) from the National Cancer Database were analyzed for predictors of NAC and NAC effects on OS with multivariate Cox proportional hazards analysis (multivariate analysis [MVA]). Propensity score matched (1:2) survival analysis of NAC (n = 968) and CRT alone (n = 1914) was also performed. Effects on OS were stratified by risk group. RESULTS On MVA, NAC-improved OS among the total cohort (hazard ratio [HR] 0.89, P = .049), particularly among stratified keratinizing histology (HR 0.82, P = .015) and N3 disease (HR 0.73, P = .046). Among propensity matched patients, NAC improved OS in patients with N3 disease (n = 336; HR 0.71, P = .046). CONCLUSIONS NAC may improve OS among nonendemic NPC patients at higher risk of distant micrometastases, particularly N3 disease and those with unfavorable histology.
Collapse
Affiliation(s)
- James E Han
- Department of Radiation Oncology, University of Arizona, Tucson, Arizona
| | - Sun K Yi
- Department of Radiation Oncology, University of Arizona, Tucson, Arizona
| | - Steven Wang
- Department of Otolaryngology, University of Arizona, Tucson, Arizona
| | - Audrey Erman
- Department of Otolaryngology, University of Arizona, Tucson, Arizona
| | - Shethal Bearelly
- Department of Otolaryngology, University of Arizona, Tucson, Arizona
| | - Simran Sindhu
- Division of Hematology-Oncology, University of Arizona, Tucson, Arizona
| | - Jared R Robbins
- Department of Radiation Oncology, University of Arizona, Tucson, Arizona
| | - Julie Bauman
- Division of Hematology-Oncology, University of Arizona, Tucson, Arizona
| | - Charles C Hsu
- Department of Radiation Oncology, University of Arizona, Tucson, Arizona
| |
Collapse
|
7
|
Lee YH, Xiao S, Kim KW, Reno JL, Bird JP, Han JE. Giant Zero Bias Anomaly due to Coherent Scattering from Frozen Phonon Disorder in Quantum Point Contacts. Phys Rev Lett 2019; 123:056802. [PMID: 31491285 DOI: 10.1103/physrevlett.123.056802] [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] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 04/26/2019] [Indexed: 06/10/2023]
Abstract
We demonstrate an unusual manifestation of coherent scattering for electron waves in mesoscopic quantum point contacts, in which fast electron dynamics allows the phonon system to serve as a quasistatic source of disorder. The low-temperature conductance of these devices exhibits a giant (≫2e^{2}/h) zero bias anomaly (ZBA), the features of which are reproduced in a nonequilibrium model for coherent scattering from the "frozen" phonon disorder. According to this model, the ZBA is understood to result from the in situ electrical manipulation of the phonon disorder, a mechanism that could open up a pathway to the on-demand control of coherent scattering in the solid state.
Collapse
Affiliation(s)
- Y-H Lee
- Department of Electrical Engineering, University at Buffalo, the State University of New York, Buffalo, New York 14260, USA
| | - S Xiao
- Department of Electrical Engineering, University at Buffalo, the State University of New York, Buffalo, New York 14260, USA
| | - K W Kim
- Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), Daejeon 34126, Republic of Korea
| | - J L Reno
- CINT, Sandia National Laboratories, Department 1881, MS 1303, Albuquerque, New Mexico 87185, USA
| | - J P Bird
- Department of Electrical Engineering, University at Buffalo, the State University of New York, Buffalo, New York 14260, USA
| | - J E Han
- Department of Physics, University at Buffalo, the State University of New York, Buffalo, New York 14260, USA
| |
Collapse
|
8
|
Virk MS, Han JE, Reiner AS, McLaughlin LA, Sciubba DM, Lis E, Yamada Y, Bilsky M, Laufer I. Frequency of symptomatic vertebral body compression fractures requiring intervention following single-fraction stereotactic radiosurgery for spinal metastases. Neurosurg Focus 2017; 42:E8. [DOI: 10.3171/2016.10.focus16359] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE
The purpose of this study was to determine the rate of symptomatic vertebral body compression fractures (VCFs) requiring kyphoplasty or surgery in patients treated with 24-Gy single-fraction stereotactic radiosurgery (SRS).
METHODS
This retrospective analysis included all patients who had been treated with 24-Gy, single-fraction, image-guided intensity-modulated radiation therapy for histologically confirmed solid tumor metastases over an 8-year period (2005–2013) at Memorial Sloan Kettering Cancer Center. Charts and imaging studies were reviewed for post-SRS kyphoplasty or surgery for mechanical instability. A Spinal Instability Neoplastic Score (SINS) was calculated for each patient both at the time of SRS and at the time of intervention for VCF.
RESULTS
Three hundred twenty-three patients who had undergone single-fraction SRS between C-1 and L-5 were included in this analysis. The cumulative incidence of VCF 5 years after SRS was 7.2% (95% CI 4.1–10.2), whereas that of death following SRS at the same time point was 82.5% (95% CI 77.5–87.4). Twenty-six patients with 36 SRS-treated levels progressed to symptomatic VCF requiring treatment with kyphoplasty (6 patients), surgery (10 patients), or both (10 patients). The median time to symptomatic VCF was 13 months. Seven patients developed VCF at 11 levels adjacent to the SRS-treated level. Fractured levels had no evidence of tumor progression. The median SINS changed from 6.5 at SRS (interquartile range [IQR] 4.3–8.8) to 11.5 at stabilization (IQR 9–13). In patients without prior stabilization at the level of SRS, there was an association between the SINS and the time to fracture.
CONCLUSIONS
Five years after ablative single-fraction SRS to spinal lesions, the cumulative incidence of symptomatic VCF at the treated level without tumor recurrence was 7.2%. Higher SINSs at the time of SRS correlated with earlier fractures.
Collapse
Affiliation(s)
- Michael S. Virk
- Departments of 1Neurological Surgery,
- 2Department of Neurological Surgery, Weill Cornell Medical College, NewYork-Presbyterian Hospital, New York, New York; and
| | | | | | | | - Daniel M. Sciubba
- 5Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Eric Lis
- 6Radiology, Memorial Sloan Kettering Cancer Center
| | | | - Mark Bilsky
- Departments of 1Neurological Surgery,
- 2Department of Neurological Surgery, Weill Cornell Medical College, NewYork-Presbyterian Hospital, New York, New York; and
| | - Ilya Laufer
- Departments of 1Neurological Surgery,
- 2Department of Neurological Surgery, Weill Cornell Medical College, NewYork-Presbyterian Hospital, New York, New York; and
| |
Collapse
|
9
|
Brea EJ, Oh CY, Manchado E, Budhu S, Gejman RS, Mo G, Mondello P, Han JE, Jarvis CA, Ulmert D, Xiang Q, Chang AY, Garippa RJ, Merghoub T, Wolchok JD, Rosen N, Lowe SW, Scheinberg DA. Kinase Regulation of Human MHC Class I Molecule Expression on Cancer Cells. Cancer Immunol Res 2016; 4:936-947. [PMID: 27680026 DOI: 10.1158/2326-6066.cir-16-0177] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 09/01/2016] [Indexed: 12/13/2022]
Abstract
The major histocompatibility complex I (MHC-1) presents antigenic peptides to tumor-specific CD8+ T cells. The regulation of MHC-I by kinases is largely unstudied, even though many patients with cancer are receiving therapeutic kinase inhibitors. Regulators of cell-surface HLA amounts were discovered using a pooled human kinome shRNA interference-based approach. Hits scoring highly were subsequently validated by additional RNAi and pharmacologic inhibitors. MAP2K1 (MEK), EGFR, and RET were validated as negative regulators of MHC-I expression and antigen presentation machinery in multiple cancer types, acting through an ERK output-dependent mechanism; the pathways responsible for increased MHC-I upon kinase inhibition were mapped. Activated MAPK signaling in mouse tumors in vivo suppressed components of MHC-I and the antigen presentation machinery. Pharmacologic inhibition of MAPK signaling also led to improved peptide/MHC target recognition and killing by T cells and TCR-mimic antibodies. Druggable kinases may thus serve as immediately applicable targets for modulating immunotherapy for many diseases. Cancer Immunol Res; 4(11); 936-47. ©2016 AACR.
Collapse
Affiliation(s)
- Elliott J Brea
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York.,Weill Cornell Medicine, New York, New York
| | - Claire Y Oh
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York.,Weill Cornell Medicine, New York, New York
| | - Eusebio Manchado
- Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center New York, New York
| | - Sadna Budhu
- Immunology Program, Memorial Sloan Kettering Cancer Center New York, New York
| | - Ron S Gejman
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York.,Weill Cornell Medicine, New York, New York
| | - George Mo
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York
| | - Patrizia Mondello
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York
| | - James E Han
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York.,Weill Cornell Medicine, New York, New York
| | - Casey A Jarvis
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York
| | - David Ulmert
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York
| | - Qing Xiang
- RNAi Core Facility, Memorial Sloan Kettering Cancer Center New York, New York
| | - Aaron Y Chang
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York.,Weill Cornell Medicine, New York, New York
| | - Ralph J Garippa
- RNAi Core Facility, Memorial Sloan Kettering Cancer Center New York, New York
| | - Taha Merghoub
- Immunology Program, Memorial Sloan Kettering Cancer Center New York, New York
| | - Jedd D Wolchok
- Weill Cornell Medicine, New York, New York.,Immunology Program, Memorial Sloan Kettering Cancer Center New York, New York
| | - Neal Rosen
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York.,Weill Cornell Medicine, New York, New York
| | - Scott W Lowe
- Weill Cornell Medicine, New York, New York.,Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center New York, New York.,Howard Hughes Medical Institute, New York, New York
| | - David A Scheinberg
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center New York, New York. .,Weill Cornell Medicine, New York, New York
| |
Collapse
|
10
|
Lee J, Han JE, Xiao S, Song J, Reno JL, Bird JP. Formation of a protected sub-band for conduction in quantum point contacts under extreme biasing. Nat Nanotechnol 2014; 9:101-105. [PMID: 24441984 DOI: 10.1038/nnano.2013.297] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 12/05/2013] [Indexed: 06/03/2023]
Abstract
Managing energy dissipation is critical to the scaling of current microelectronics and to the development of novel devices that use quantum coherence to achieve enhanced functionality. To this end, strategies are needed to tailor the electron-phonon interaction, which is the dominant mechanism for cooling non-equilibrium ('hot') carriers. In experiments aimed at controlling the quantum state, this interaction causes decoherence that fundamentally disrupts device operation. Here, we show a contrasting behaviour, in which strong electron-phonon scattering can instead be used to generate a robust mode for electrical conduction in GaAs quantum point contacts, driven into extreme non-equilibrium by nanosecond voltage pulses. When the amplitude of these pulses is much larger than all other relevant energy scales, strong electron-phonon scattering induces an attraction between electrons in the quantum-point-contact channel, which leads to the spontaneous formation of a narrow current filament and to a renormalization of the electronic states responsible for transport. The lowest of these states coalesce to form a sub-band separated from all others by an energy gap larger than the source voltage. Evidence for this renormalization is provided by a suppression of heating-related signatures in the transient conductance, which becomes pinned near 2e(2)/h (e, electron charge; h, Planck constant) for a broad range of source and gate voltages. This collective non-equilibrium mode is observed over a wide range of temperature (4.2-300 K) and may provide an effective means to manage electron-phonon scattering in nanoscale devices.
Collapse
Affiliation(s)
- J Lee
- Department of Electrical Engineering, University at Buffalo, State University of New York, 230 Davis Hall, Buffalo, New York 14260-1900, USA
| | - J E Han
- Department of Physics, University at Buffalo, State University of New York, 239 Fronczak Hall, Buffalo, New York 14260-1500, USA
| | - S Xiao
- Department of Electrical Engineering, University at Buffalo, State University of New York, 230 Davis Hall, Buffalo, New York 14260-1900, USA
| | - J Song
- Department of Electrical Engineering, University at Buffalo, State University of New York, 230 Davis Hall, Buffalo, New York 14260-1900, USA
| | - J L Reno
- CINT, Sandia National Laboratories, Department 1131, MS 1303, Albuquerque, New Mexico 87185, USA
| | - J P Bird
- Department of Electrical Engineering, University at Buffalo, State University of New York, 230 Davis Hall, Buffalo, New York 14260-1900, USA
| |
Collapse
|
11
|
Subramanian H, Han JE. In-plane uniaxial magnetic anisotropy in (Ga, Mn)As due to local lattice distortions around Mn²⁺ ions. J Phys Condens Matter 2013; 25:206005. [PMID: 23615156 DOI: 10.1088/0953-8984/25/20/206005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We theoretically investigate the interplay between local lattice distortions around the Mn(2+) impurity ion and its magnetization, mediated through spin-orbit coupling of holes. We show that the tetrahedral symmetry around the Mn(2+) ion is spontaneously broken and that local Jahn-Teller distortions coupled with growth strain result in uniaxial magnetic anisotropy. We also account for the experimentally observed in-plane uniaxial magnetic anisotropy rotation due to variation of hole density. According to this model, lack of inversion and top-down symmetries of (Ga, Mn)As layers lead to in-plane biaxial symmetry breaking in the presence of Jahn-Teller distortions.
Collapse
|
12
|
Kim JH, Son JS, Choi YJ, Choresca CH, Shin SP, Han JE, Jun JW, Kang DH, Oh C, Heo SJ, Park SC. Isolation and characterization of a lytic Myoviridae bacteriophage PAS-1 with broad infectivity in Aeromonas salmonicida. Curr Microbiol 2012; 64:418-26. [PMID: 22314935 DOI: 10.1007/s00284-012-0091-x] [Citation(s) in RCA: 29] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Accepted: 01/18/2012] [Indexed: 10/14/2022]
Abstract
To search for candidate control agents against Aeromonas salmonicida subsp. salmonicida infections in aquaculture, one bacteriophage (phage), designated as PAS-1, was isolated from the sediment samples of the rainbow trout (Oncorhynchus mykiss) culture farm in Korea. The PAS-1 was morphologically classified as Myoviridae and possessed approximately 48 kb of double-strand genomic DNA. The phage showed broad host ranges to other subspecies of A. salmonicida as well as A. salmonicida subsp. salmonicida including antibiotic-resistant strains. Its latent period and burst size were estimated to be approximately 40 min and 116.7 PFU/cell, respectively. Furthermore, genomic and structural proteomic analysis of PAS-1 revealed that the phage was closely related to other Myoviridae phages infecting enterobacteria or Aeromonas species. The bacteriolytic activity of phage PAS-1 was evaluated using three subspecies of A. salmonicida strain at different doses of multiplicity of infection, and the results proved to be efficient for the reduction of bacterial growth. Based on these results, PAS-1 could be considered as a novel Aeromonas phage and might have potentiality to reduce the impacts of A. salmonicida infections in aquaculture.
Collapse
Affiliation(s)
- J H Kim
- Laboratory of Aquatic Animal Medicine, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 151-742, Republic of Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Appelboom G, Piazza M, Han JE, Bruce SS, Hwang B, Monahan A, Hwang RY, Kisslev S, Mayer S, Meyers PM, Badjatia N, Connolly ES. von Willebrand factor genetic variant associated with hematoma expansion after intracerebral hemorrhage. J Stroke Cerebrovasc Dis 2012; 22:713-7. [PMID: 22244714 DOI: 10.1016/j.jstrokecerebrovasdis.2011.10.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2011] [Revised: 10/26/2011] [Accepted: 10/28/2011] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Hematoma expansion, the leading cause of neurologic deterioration after intracerebral hemorrhage (ICH), remains one of the few modifiable risk factors for poor outcome. In the present study, we explored whether common genetic variants within the hemostasis pathway were related to hematoma expansion during the acute period after ICH. METHODS Patients with spontaneous ICH who were admitted to the institutional Neuro-ICU between 2009 and 2011 were enrolled in the study, and clinical data were collected prospectively. Hematoma size was measured in patients admitted on or before postbleed day 2. Baseline models for hematoma growth were constructed using backwards stepwise logistic regression. Genotyping of single-nucleotide polymorphisms for 13 genes involved in hemostasis was performed, and the results were individually included in the above baseline models to test for independent association of hematoma expansion. RESULTS During the study period, 82 patients were enrolled in the study and had complete data. The mean age was 65.9 ± 14.9 years, and 38% were female. Only von Willebrand factor was associated with absolute and relative hematoma growth in univariate analysis (P < .001 and P = .007, respectively); von Willebrand factor genotype was independently predictive of relative hematoma growth but only approached significance for absolute hematoma growth (P = .002 and P = .097, respectively). CONCLUSIONS Our genomic analysis of various hemostatic factors identified von Willebrand factor as a potential predictor of hematoma expansion in patients with ICH. The identification of von Willebrand factor single-nucleotide polymorphisms may allow us to better identify patients who are at risk for hematoma enlargement and will benefit the most from treatment. The relationship of von Willebrand factor with regard to hematoma enlargement in a larger population warrants further study.
Collapse
Affiliation(s)
- Geoffrey Appelboom
- Cerebrovascular Laboratory, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Kim JH, Kim HK, Nguyen VG, Park BK, Choresca CH, Shin SP, Han JE, Jun JW, Park SC. Genomic sequence of infectious hypodermal and hematopoietic necrosis virus (IHHNV) KLV-2010-01 originating from the first Korean outbreak in cultured Litopenaeus vannamei. Arch Virol 2011; 157:369-73. [PMID: 22038073 DOI: 10.1007/s00705-011-1155-0] [Citation(s) in RCA: 13] [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] [Received: 09/20/2011] [Accepted: 10/17/2011] [Indexed: 11/25/2022]
Abstract
Due to the need to track and monitor genetic diversity, the genome of the infectious hypodermal and hematopoietic necrosis virus (IHHNV) strain KLV-2010-01 in cultured Litopenaeus vannamei shrimp that originated from the first Korean outbreak in 2010 was sequenced and analyzed. The genome, with a length of 3914 nucleotides, was sequenced from the Korean IHHNV. The genome encoded three large and overlapping open reading frames: ORF1 (NS-1) of 2001 bp, ORF2 (NS-2) of 1092 bp and ORF3 (capsid protein) of 990 bp. The overall organization, size and predicted amino acid sequence of the three ORFs in Korean IHHNV were highly similar to those of members of the infectious IHHNV group, and the most closely related strains were IHHNVs described from Ecuador and Hawaii. Additionally, phylogenetic analysis showed that the Korean IHHNV was clustered with lineage III in the infectious IHHNV group and was most similar to IHHNV isolates from Ecuador, China and Taiwan.
Collapse
Affiliation(s)
- J H Kim
- Laboratory of Aquatic Animal Medicine, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 151-742, Republic of Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Han SY, Kang BK, Kang BJ, Shin SP, Soen BH, Kim JM, Kim JH, Choresca CH, Han JE, Jun JW, Park SC. Prevalence and different characteristics of two serotypes of Streptococcus parauberis isolated from the farmed olive flounder, Paralichthys olivaceus (Temminck and Schlegel), in Korea. J Fish Dis 2011; 34:731-739. [PMID: 21916898 DOI: 10.1111/j.1365-2761.2011.01289.x] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The prevalence of two serotypes of Streptococcus parauberis isolated from the olive flounder, Paralichthys olivaceus, was evaluated in a total of 29 isolates between 2003 and 2010 in Korea. Streptococcus parauberis isolates were divided into two serologically distinct types (serotype 1 and serotype 2), except for one strain (S1091), using an agglutination assay with rabbit antiserum, and serotype 1 was identified as the dominant type (24 of 29 isolates) in this study. To identify the characteristics of the two serotypes of S. parauberis, we conducted a biochemical test using the API 20 Strep kit, a transmission electron microscopy (TEM) assay, sequence analysis of 16S-23S rRNA intergenic spacer region (ISR) and a pathogenicity test. In TEM, both serotypes possessed polysaccharide capsule layers around the cell surface when bacterial cells were treated with a homologous serotype of rabbit antiserum. However, we were unable to discriminate serotype-specific biochemical characteristics and genetic characteristics of 16S-23S rRNA ISR between the two serotypes. In the pathogenicity test, the serotype 1 strains induced significantly higher mortality than the serotype 2 strains in olive flounder when experimentally inoculated via the intraperitoneal route.
Collapse
Affiliation(s)
- S Y Han
- Research Unit, Green Cross Veterinary Product, Yongin, Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Albesiano E, Davis M, See AP, Han JE, Lim M, Pardoll DM, Kim Y. Immunologic consequences of signal transducers and activators of transcription 3 activation in human squamous cell carcinoma. Cancer Res 2010; 70:6467-76. [PMID: 20682796 DOI: 10.1158/0008-5472.can-09-4058] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Paracrine cross-talk between tumor cells and immune cells within the tumor microenvironment underlies local mechanisms of immune evasion. Signal transducer and activator of transcription 3 (STAT3), which is constitutively activated in diverse cancer types, is a key regulator of cytokine and chemokine expression in murine tumors, resulting in suppression of both innate and adaptive antitumor immunity. However, the immunologic effects of STAT3 activation in human cancers have not been studied in detail. To investigate how STAT3 activity in human head and neck squamous cell carcinoma (HNSCC) might alter the tumor microenvironment to enable immune escape, we used small interfering RNA and small-molecule inhibitors to suppress STAT3 activity. STAT3 inhibition in multiple primary and established human squamous carcinoma lines resulted in enhanced expression and secretion of both proinflammatory cytokines and chemokines. Although conditioned medium containing supernatants from human HNSCC inhibited lipopolysaccharide-induced dendritic cell activation in vitro, supernatants from STAT3-silenced tumor cells reversed this immune evasion mechanism. Moreover, supernatants from STAT3-silenced tumor cells were able to stimulate the migratory behavior of lymphocytes from human peripheral blood in vitro. These results show the importance of STAT3 activation in regulating the immunomodulatory mediators by human tumors and further validate STAT3 as a promising target for therapeutic intervention.
Collapse
Affiliation(s)
- Emilia Albesiano
- Department of Oncology and the Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231, USA
| | | | | | | | | | | | | |
Collapse
|
17
|
Abstract
Even though the central nervous system (CNS) was conventionally defined as "immunologically privileged", new discoveries have demonstrated the role of the immune system in neurologic disease and illness, including gliomas. Brain tumor immunotherapy is an exciting and revived area of research, in which neurosurgeons have taken a major position. Despite the ability to induce a tumor-specific systemic immune response, the challenge to effectively eradicate intracranial gliomas remains mainly because of tumor-induced immunoresistance. This article gives an overview of the immunologic responses that occur in the CNS and their potential role in brain tumors. The main cellular and molecular mechanisms that mediate tumor escape from natural immune surveillance are also covered in this article. Glioma cells have been shown to diminish the expression of danger signals necessary for immune activation and to increase the concentration of immunosuppressive factors in the tumor microenvironment, which results in T-cell anergy or apoptosis. Finally, the authors discuss most of the over-expressed oncogenic signaling pathways that cause tumor tolerance.
Collapse
Affiliation(s)
- Emilia Albesiano
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
| | | | | |
Collapse
|
18
|
Aryanpour K, Han JE. Ferromagnetic spin coupling as the origin of 0.7 anomaly in quantum point contacts. Phys Rev Lett 2009; 102:056805. [PMID: 19257537 DOI: 10.1103/physrevlett.102.056805] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2008] [Indexed: 05/25/2023]
Abstract
We study one-dimensional itinerant electron models with ferromagnetic coupling to investigate the origin of the 0.7 anomaly in quantum point contacts. Linear conductance calculations from the quantum Monte Carlo technique for spin interactions of different spatial range suggest that 0.7(2e;{2}/h) anomaly results from a strong interaction of low-density conduction electrons to ferromagnetic fluctuations formed across the potential barrier. The conductance plateau appears due to the strong incoherent scattering at high temperature when the electron traversal time matches the time scale of dynamic ferromagnetic excitations.
Collapse
Affiliation(s)
- K Aryanpour
- Department of Physics, SUNY at Buffalo, Buffalo, New York 14260, USA
| | | |
Collapse
|
19
|
Han JE, Heary RJ. Imaginary-time formulation of steady-state nonequilibrium: application to strongly correlated transport. Phys Rev Lett 2007; 99:236808. [PMID: 18233398 DOI: 10.1103/physrevlett.99.236808] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2007] [Indexed: 05/25/2023]
Abstract
We extend the imaginary-time formulation of the equilibrium quantum many-body theory to steady-state nonequilibrium with an application to strongly correlated transport. By introducing the Matsubara voltage, we maintain the finite chemical potential shifts in the Fermi-Dirac function, in agreement with the Keldysh formulation. The formulation is applied to strongly correlated transport in the Kondo regime using the quantum Monte Carlo method.
Collapse
Affiliation(s)
- J E Han
- Department of Physics, State University of New York at Buffalo, Buffalo, New York 14260, USA
| | | |
Collapse
|
20
|
Abstract
Better known as Taxol (Bristol-Myers Squibb), paclitaxel is the first member of the taxane family to be used in cancer chemotherapy. The taxanes exert their cytotoxic effect by arresting mitosis through microtubule stabilization, resulting in cellular apoptosis. The use of paclitaxel as a chemotherapeutic agent has become a broadly accepted option in the treatment of patients with ovarian, breast and non-small cell lung cancers, malignant brain tumors, and a variety of other solid tumors. However, significant toxicities, such as myelosuppression and peripheral neuropathy, limit the effectiveness of paclitaxel-based treatment regimens. This review addresses the toxicities associated with paclitaxel treatment and describes existing and future strategies of paclitaxel administration directed at limiting these toxicities.
Collapse
Affiliation(s)
- Neena I Marupudi
- Johns Hopkins School of Medicine, Department of Neurological Surgery, Meyer 7-113, 600 North Wolfe Street, Baltimore, MD 21287, USA
| | | | | | | | | | | |
Collapse
|
21
|
Han JE, Gunnarsson O, Crespi VH. Strong superconductivity with local Jahn-Teller phonons in C60 solids. Phys Rev Lett 2003; 90:167006. [PMID: 12731998 DOI: 10.1103/physrevlett.90.167006] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2002] [Indexed: 05/24/2023]
Abstract
We analyze fulleride superconductivity at experimental doping levels, treating the electron-electron and electron-phonon interactions on an equal footing, and demonstrate that the Jahn-Teller phonons create a local (intramolecular) pairing which is surprisingly resistant to the Coulomb repulsion, despite the weakness of retardation in these low-bandwidth systems. The requirement for coherence throughout the solid then yields a very strong doping dependence to T(c), one consistent with experiment and much stronger than expected from standard Eliashberg theory.
Collapse
Affiliation(s)
- J E Han
- Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, USA
| | | | | |
Collapse
|
22
|
Han JE, Crespi VH. Abrupt topological transitions in the hysteresis curves of ferromagnetic metalattices. Phys Rev Lett 2002; 89:197203. [PMID: 12443144 DOI: 10.1103/physrevlett.89.197203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2002] [Indexed: 05/24/2023]
Abstract
When a metal is confined to the interstices of an inert colloidal crystal, the intrinsic order parameter(s) of electronic and magnetic phenomena within the metal interact with the structural order parameter of the surrounding (and confining) colloidal crystal. If the magnetic stiffness length is comparable to the colloidal lattice constant, the interplay of competing interactions stabilizes multiple topologically distinct magnetic phases separated by sharp transitions in the hysteresis curves. The colloidal confinement also induces substantial coercivity in metals that are perfectly soft in the bulk.
Collapse
Affiliation(s)
- J E Han
- Department of Physics and Materials Research Institute, The Pennsylvania State University, 104 Davey Lab, University Park, Pennsylvania 16802-6300, USA
| | | |
Collapse
|
23
|
Han JE, Crespi VH. Tuning Fermi-surface properties through quantum confinement in metallic metalattices: new metals from old atoms. Phys Rev Lett 2001; 86:696-699. [PMID: 11177915 DOI: 10.1103/physrevlett.86.696] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2000] [Indexed: 05/23/2023]
Abstract
We describe a new class of nanoscale structured metals wherein the effects of quantum confinement are combined with dispersive metallic electronic states to induce modifications to the fundamental low-energy microscopic properties of a three-dimensional metal: the density of states, the distribution of Fermi velocities, and the collective electronic response.
Collapse
Affiliation(s)
- J E Han
- Department of Physics and the Center for Materials Physics, The Pennsylvania State University, 104 Davey Lab, University Park, Pennsylvania 16802-6300, USA
| | | |
Collapse
|
24
|
Han JE, Koch E, Gunnarsson O. Metal-insulator transitions: influence of lattice structure, jahn-teller effect, and Hund's rule coupling. Phys Rev Lett 2000; 84:1276-1279. [PMID: 11017497 DOI: 10.1103/physrevlett.84.1276] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/1999] [Indexed: 05/23/2023]
Abstract
We study the influence of the lattice structure, the Jahn-Teller effect, and the Hund's rule coupling on a metal-insulator transition in A(n)C60 (A = K,Rb). The difference in the lattice structure favors A3C60 (fcc) being a metal and A4C60 (bct) being an insulator, and the coupling to H(g) Jahn-Teller phonons favors A4C60 being nonmagnetic. The coupling to H(g) ( A(g)) phonons decreases (increases) the value U(c) of the Coulomb integral at which the metal-insulator transition occurs. There is an important partial cancellation between the Jahn-Teller effect and the Hund's rule coupling.
Collapse
Affiliation(s)
- JE Han
- Max-Planck-Institut fur Festkorperforschung, D-70506 Stuttgart, Germany
| | | | | |
Collapse
|