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LeBlanc MR, Zhou X, Baggett CD, Tuchman SA, Jensen CE, Lichtman EI, Rubinstein SM. Second Line Therapy in Multiple Myeloma: A SEER Medicare Analysis. Clin Lymphoma Myeloma Leuk 2024:S2152-2650(24)00154-X. [PMID: 38760283 DOI: 10.1016/j.clml.2024.04.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 04/08/2024] [Accepted: 04/13/2024] [Indexed: 05/19/2024]
Abstract
INTRODUCTION The therapeutic landscape in relapsed/refractory multiple myeloma (RRMM) has changed rapidly, with twenty-two drug approvals since 2012. We characterized population-level trends in RRMM therapy selection, survival and cost outcomes associated with RRMM treatment over time. MATERIALS AND METHODS Our cohort included adults diagnosed with multiple myeloma (MM) in the SEER-Medicare database from 2007-2017 who received at least one antimyeloma agent. MM-directed therapies and lines of therapy were identified. Changes in 2LT regimens over time were described. Trends in overall survival from 2LT initiation over time were analyzed using a Cox proportional hazards model adjusting for factors associated with survival in MM. Trends in mean inflation-adjusted cost per 12 months of 2LT were analyzed using JoinPoint analysis. RESULTS A total of 9,822 patients met eligibility criteria, of whom 5,866 (59.7%) received 2LT. By 2018, 46% of 2LT regimens contained at least one agent approved in 2012 or later. Year of 2LT initiation was associated with improved overall survival (HR 0.78 per 5 years, 95% CI 0.74-0.84) after adjustment. Costs associated with 2LT increased over the study period, and the rate of cost increase increased significantly after 2012 (0.89%/year vs. 9.9%/year, P < .001), with higher total costs for regimens containing newer novel agents (mean $224,193 vs. $189,381, P < .001) CONCLUSION: Overall survival after initiation of 2LT has improved, however this has been accompanied by significant increases in costs of RRMM treatment, particularly for patients receiving newer novel agents. These findings provide useful context for existing and future drug approvals in RRMM.
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Affiliation(s)
- Matthew R LeBlanc
- University of North Carolina at Chapel Hill School of Nursing, Chapel Hill, North Carolina, USA; UNC Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina, USA.
| | - Xi Zhou
- UNC Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina, USA
| | | | - Sascha A Tuchman
- UNC Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina, USA; University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
| | - Christopher E Jensen
- UNC Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina, USA; University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
| | - Eben I Lichtman
- UNC Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina, USA; University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
| | - Samuel M Rubinstein
- UNC Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina, USA; University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
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Jensen CE, Deal AM, Nyrop KA, Logan M, Mangieri NJ, Strayhorn MD, Miller J, Muss HB, Lichtman EI, Rubinstein SM, Tuchman SA. Geriatric assessment-guided interventions for older adults with multiple myeloma: A feasibility and acceptability study. J Geriatr Oncol 2024; 15:101680. [PMID: 38104482 PMCID: PMC10922464 DOI: 10.1016/j.jgo.2023.101680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 10/11/2023] [Accepted: 11/29/2023] [Indexed: 12/19/2023]
Abstract
INTRODUCTION Geriatric assessment (GA)-guided supportive care programs have been successful in improving treatment outcomes for older adults with solid-organ cancers. This study aimed to evaluate the feasibility of a GA-guided supportive care program among older adults treated for multiple myeloma (MM). MATERIALS AND METHODS The study utilized an existing registry of adults with plasma cell disorders at the University of North Carolina. Patients with MM, aged 60 or older, and having a GA-identified deficit in one or more problem area were offered referrals to supportive care resources during routine visits. Problem areas included physical function deficits, polypharmacy, and anxiety or depression. Patients with physical function deficits were offered referral to physical therapy (PT), those with polypharmacy to an Oncology Clinical Pharmacist Practitioner (CPP), and those with mental health symptoms to the Comprehensive Cancer Support Program (CCSP). RESULTS Of the 58 individuals identified as having at least one deficit on the GA, PT was the most commonly identified relevant resource (79%), followed by CPP visits (57%). Among individuals that were offered referral(s) to at least one new supportive care resource, the acceptance rate was 50%. Referral acceptance rates were highest among those recommended for a CPP visit (55% of those approached) and lowest for CCSP (0%). DISCUSSION The study examined the feasibility and acceptability of a referral program for supportive care resources among older adults with MM who have deficits on GA. The most commonly identified deficit was physical functioning, followed by polypharmacy and mental health. The study found that physical interventions and referrals to CPPs were the most accepted interventions. However, the low proportion of patients who accepted physical therapy referrals indicates the need for tailored and more personalized approaches. Further research is needed to explore the feasibility and impact of supportive care referral programs for older adults with MM.
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Affiliation(s)
- Christopher E Jensen
- Division of Hematology, Department of Medicine, University of North Carolina at Chapel Hill, 170 Manning Drive, Physicians Office Building, CB# 7305, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA.
| | - Allison M Deal
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA.
| | - Kirsten A Nyrop
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA; Division of Oncology, Department of Medicine, University of North Carolina at Chapel Hill, 170 Manning Drive, Physicians Office Building, CB# 7305, Chapel Hill, NC 27599, USA.
| | - Maya Logan
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA.
| | - Nicholas J Mangieri
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA.
| | - Martha D Strayhorn
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA.
| | - Jordan Miller
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA.
| | - Hyman B Muss
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA; Division of Oncology, Department of Medicine, University of North Carolina at Chapel Hill, 170 Manning Drive, Physicians Office Building, CB# 7305, Chapel Hill, NC 27599, USA.
| | - Eben I Lichtman
- Division of Hematology, Department of Medicine, University of North Carolina at Chapel Hill, 170 Manning Drive, Physicians Office Building, CB# 7305, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA.
| | - Samuel M Rubinstein
- Division of Hematology, Department of Medicine, University of North Carolina at Chapel Hill, 170 Manning Drive, Physicians Office Building, CB# 7305, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA.
| | - Sascha A Tuchman
- Division of Hematology, Department of Medicine, University of North Carolina at Chapel Hill, 170 Manning Drive, Physicians Office Building, CB# 7305, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, 450 West Drive, Chapel Hill, NC 27599, USA.
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Grant SJ, Jansen M, Kuo TM, Rubinstein SM, Wildes TM, Tuchman SA, Muss HB, Lichtman EI, Charlot M. Cross-Sectional Analysis of Clinical Trial Availability and North Carolina Neighborhood Social Vulnerability. JCO Oncol Pract 2023; 19:e248-e262. [PMID: 36473128 PMCID: PMC9970296 DOI: 10.1200/op.22.00325] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 09/01/2022] [Accepted: 09/21/2022] [Indexed: 12/12/2022] Open
Abstract
PURPOSE Residents of communities facing social vulnerability (eg, poverty) have limited access to clinical trials, leaving them susceptible to experiencing poor health outcomes. We examined the association between North Carolina county-level social vulnerability and available multiple myeloma (MM) trials. METHODS Using a novel data linkage between ClinicalTrials.gov, the 2019 American Community Survey, and the Centers for Disease Control and Prevention's Social Vulnerability Index, we investigated at the county level (1) availability of MM trial sites and (2) the relationship between Social Vulnerability Index and MM trial site availability using logistic regression. RESULTS Between 2002 and 2021, 229 trials were registered across 462 nonunique trial sites in 34 counties. Nearly 50% of trial sites were in academic medical centers, 80% (n = 372) of all trials were industry-sponsored, 60% (n = 274) were early-phase, and 50% (n = 232) were for patients with relapsed or refractory MM. Counties with low as opposed to high poverty rates had six times greater odds of having ≥ 1 MM trial sites (odds ratio [OR], 5.60; 95% CI, 1.85 to 19.64; P = .004). Counties with the lowest percentage of Black Indigenous Persons of Color and non-native English speakers had 77% lower odds (OR, 0.23; 95% CI, 0.07 to 0.69; P = .011) of having ≥ 1 trial sites. The effect remained significant after accounting for the presence of five academic medical centers (n = 95; OR, 0.18; 95% CI, 0.05 to 0.6; P = .008) and adjustment for metropolitan, suburban, or rural status (OR, 0.25; 95% CI, 0.07 to 0.81; P = .025). CONCLUSION Counties with the lowest poverty rates had more MM trial sites, whereas those with the lowest percentage of Black Indigenous Persons of Color populations had fewer MM trial sites. Multilevel efforts are needed to improve the availability and access to trials for socially vulnerable populations.
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Affiliation(s)
- Shakira J. Grant
- Division of Hematology, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Matthew Jansen
- University Libraries, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Tzy-Mey Kuo
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Samuel M. Rubinstein
- Division of Hematology, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Tanya M. Wildes
- Division of Hematology and Oncology, Department of Medicine, University of Nebraska Medical Center, Omaha, NE
| | - Sascha A. Tuchman
- Division of Hematology, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Hyman B. Muss
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC
- Division of Medical Oncology, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Eben I. Lichtman
- Division of Hematology, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Marjory Charlot
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC
- Division of Medical Oncology, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC
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Yusuf ARS, Heiling HM, Deal AM, Jensen CE, Mangieri NJ, Nyrop KA, Lichtman EI, Rubinstein SM, Grant SJ, Wood WA, Tuchman SA, Nakamura ZM. Longitudinal Analysis of Patient-Reported Cognitive Function in Multiple Myeloma. Clin Lymphoma Myeloma Leuk 2022; 22:920-927. [PMID: 36085276 PMCID: PMC9691560 DOI: 10.1016/j.clml.2022.08.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/14/2022] [Accepted: 08/10/2022] [Indexed: 01/26/2023]
Abstract
BACKGROUND Cancer-related cognitive impairment (CRCI) has been largely unstudied in patients with multiple myeloma (MM). This study describes patient-reported cognition over time and patient factors associated with adverse cognitive outcomes in MM. METHODS Participants enrolled in a registry in which they completed a geriatric assessment at study entry, and 3 & 6 months after entry. Cognitive function was assessed using the EORTC QLQ-C30 Cognitive Function subscale, with CRCI defined as scores < 75. Generalized estimating equation (GEE) models were used to fit longitudinal models to investigate differences by group and differences in changes over time by group, with adjustment for time since diagnosis. RESULTS One hundred and four adults with MM had mean age of 67 years and 30% identified as Black. Patient-reported CRCI was present in 18% of participants at enrollment, 21% at 3 months, and 30% at 6 months. Worse cognitive function was reported in those with impairments in physical function (P = .002), IADLs (P = .02), and performance status (P = .04), as well as in those who were prefrail/frail (P = .02) and depressed (P = .049). Greater cognitive decline over time was observed in patients without CRCI at enrollment (P < .0001) and those with lower levels of education (P = .04). CONCLUSION This is one of the first studies to describe longitudinal changes in patient-reported cognition in patients with MM. Several potentially intervenable factors, including physical function impairment and depression, were associated with worse cognition at study entry, but only baseline CRCI status and education level were predictive of future decline.
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Affiliation(s)
| | - Hillary M Heiling
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Allison M Deal
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Christopher E Jensen
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Medicine, Division of Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Nicholas J Mangieri
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Kirsten A Nyrop
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Medicine, Division of Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Eben I Lichtman
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Samuel M Rubinstein
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Shakira J Grant
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - William A Wood
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Sascha A Tuchman
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Zev M Nakamura
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC; Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, NC.
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Martínez JC, Lichtman EI. Localized light chain amyloidosis: A self-limited plasmacytic B-cell lymphoproliferative disorder. Front Oncol 2022; 12:1002253. [PMID: 36457485 PMCID: PMC9705961 DOI: 10.3389/fonc.2022.1002253] [Citation(s) in RCA: 1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 10/24/2022] [Indexed: 08/31/2023] Open
Abstract
Immunoglobulin light chain amyloidosis can be either systemic or localized. Although these conditions share a similar name, they are strikingly different. Localized light chain amyloidosis has been challenging to characterize due to its lower incidence and highly heterogeneous clinical presentation. Here, we review the emerging literature, emphasizing recent reports on large cohorts of patients with localized amyloidosis, and provide insights into this condition's pathology and natural history. We find that patients with localized amyloidosis have an excellent prognosis with overall survival similar to that of the general population. Furthermore, the risk of progression to systemic disease is low and likely represents initial mischaracterization as localized disease. Therefore, we argue for the incorporation of more sensitive techniques to rule out systemic disease at diagnosis. Despite increasing mechanistic understanding of this condition, much remains to be discovered regarding the cellular clonal evolution and the molecular processes that give rise to localized amyloid formation. While localized surgical resection of symptomatic disease is typically the treatment of choice, the presentation of this disease across the spectrum of plasmacytic B-cell lymphoproliferative disorders, and the frequent lack of an identifiable neoplastic clone, can make therapy selection a challenge in the uncommon situation that systemic chemotherapy is required.
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Affiliation(s)
- José C. Martínez
- Division of Hematology, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Eben I. Lichtman
- Division of Hematology, Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
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Nakamura ZM, Vohra SN, Jensen CE, Nyrop KA, Deal AM, Heiling HM, Mangieri NJ, Grant SJ, Lichtman EI, Rubinstein SM, Wood WA, Muss HB, Tuchman SA. Prevalence and clinical correlates of cognitive impairment in adults with plasma cell disorders. J Geriatr Oncol 2022; 13:987-996. [PMID: 35484067 PMCID: PMC10024927 DOI: 10.1016/j.jgo.2022.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 03/21/2022] [Accepted: 04/14/2022] [Indexed: 01/16/2023]
Abstract
INTRODUCTION Older adults with plasma cell disorders (PCDs) experience cognitive dysfunction that may be attributable to the disease and associated therapies. Yet, this has seldom been reported in the literature. Our objectives were to describe cognitive function (objective and patient-reported) in adults with PCDs and to explore clinical correlates of cognitive impairment. MATERIALS AND METHODS Participants completed a geriatric assessment between March 2018 and February 2020. Cognitive function was evaluated using two objective measures - Montreal Cognitive Assessment (MoCA, cutpoint <26) and Blessed Orientation Memory Concentration Test (BOMC, cutpoint >4) - and two patient-reported outcome (PRO) measures - Patient-Reported Outcomes Measurement Information System Cognitive Function (PROMIS-CF, cutpoint <45) and European Organization for Research and Treatment of Cancer Cognitive Functioning subscale (EORTC-CF, cutpoint <75). Spearman correlations examined relationships among these measures and log binomial regression was used to examine characteristics associated with cognitive impairment, as defined by the MoCA and PROMIS-CF measures. RESULTS Among 86 participants with a mean age of 69 (range: 46-91), the prevalence of cognitive dysfunction was between 20% (BOMC) and 63% (MoCA). There was moderate correlation among objective measures (r = 0.51, p < 0.0001), moderate to high correlation among PRO measures (r = 0.69, p < 0.0001), but no correlation between objective and PRO measures. Factors associated with objective impairment included ≤ high school education (RR 1.46, p = 0.009), living alone (RR 1.42, p = 0.02), relapsed/refractory disease (RR 1.39, p = 0.04), empirically de-intensified induction therapy (RR 1.62, p = 0.008), frailty (RR 1.49, p = 0.04), and peripheral vascular disease (RR 1.54, p = 0.002). Factors associated with PRO impairment included social isolation (RR 3.43, p = 0.003), depression (RR 3.30, p = 0.004) and anxiety (RR 4.43, p = 0.0002), frailty (RR 3.60, p = 0.02), falls in the previous 6 months (RR 2.53, p = 0.02), and deficits in physical function (RR 4.44, p = 0.01). Older age was not associated with either objective or PRO impairment. DISCUSSION Cognitive impairment, using objective and PRO screening measures, was relatively common in adults with PCDs. Cancer-related factors and medical comorbidities were associated with objective cognitive impairment whereas psychosocial and functional factors were associated with PRO impairment.
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Affiliation(s)
- Zev M Nakamura
- Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
| | - Sanah N Vohra
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Christopher E Jensen
- Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Medicine, Division of Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Kirsten A Nyrop
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Medicine, Division of Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Allison M Deal
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Hillary M Heiling
- Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Nicholas J Mangieri
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Shakira J Grant
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Eben I Lichtman
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Samuel M Rubinstein
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - William A Wood
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Hyman B Muss
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Medicine, Division of Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Sascha A Tuchman
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Medicine, Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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Jensen CE, Vohra SN, Nyrop KA, Deal AM, LeBlanc MR, Grant SJ, Muss HB, Lichtman EI, Rubinstein SM, Wood WA, Mangieri NJ, Jamison L, Tuchman SA. OUP accepted manuscript. Oncologist 2022; 27:694-702. [PMID: 35511734 PMCID: PMC9355823 DOI: 10.1093/oncolo/oyac079] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 03/22/2022] [Indexed: 11/12/2022] Open
Affiliation(s)
- Christopher E Jensen
- Corresponding author: Christopher E. Jensen, MD, 170 Manning Drive, Houpt Building, CB# 7305, 3rd Floor, Chapel Hill, NC 27599, USA. Tel: +1 252 908 1739; Fax: +1 919 966 6735;
| | - Sanah N Vohra
- Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Kirsten A Nyrop
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Division of Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Allison M Deal
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Matthew R LeBlanc
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Shakira J Grant
- Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Hyman B Muss
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Division of Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Eben I Lichtman
- Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Samuel M Rubinstein
- Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - William A Wood
- Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Nicholas J Mangieri
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Lee Jamison
- Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Division of Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Sascha A Tuchman
- Division of Hematology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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Jensen CE, Nyrop KA, Vohra S, Deal AM, Muss HB, Lichtman EI, Rubinstein SM, Tuchman SA, Grant SJ. Physical function, cognitive impairment, and quality-of-life among adults with multiple myeloma and associated plasma cell disorders. J Clin Oncol 2021. [DOI: 10.1200/jco.2021.39.15_suppl.e20004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e20004 Background: Multiple myeloma (MM) and immunoglobulin light chain (AL) amyloidosis are clonal plasma cell disorders (PCDs) of aging, with median ages at diagnosis of 69 and 76 years, respectively. The care of adults with these disorders is often challenging due to the higher prevalence of vulnerabilities with advancing age. We examined the prevalence of physical or cognitive impairments and associations with quality-of-life (QoL) ratings in a longitudinal cohort of adults with PCDs. Methods: Adults undergoing treatment for PCDs were recruited to a longitudinal observational study (NCT03717844) from 2018 to 2020. A modified Cancer and Aging Research Group (CARG) geriatric assessment (GA) was administered at enrollment. Patients also completed the European Organization for Research and Treatment of Cancer QoL Questionnaire Core 30 (EORTC QLQ-C30), which provided subscales of physical function, cognitive function, and global QoL (range 0-100; higher values indicate better function or QoL). Univariate linear regression was used to evaluate associations at the time of enrollment. Results: Among 121 consecutive adults, the mean age was 69 years, 65.8% were aged ≥ 65 years, and 71.9% were white. Diagnoses included MM in 73.6%, AL amyloidosis in 14.0%, and both disorders in 7.4%. The remaining 5.0% had another PCD warranting chemotherapy. Time from diagnosis at enrollment was ≤ 6 months for 25.6%, 6 to 24 months for 18.1%, and ≥ 24 months for 56.3%. In this cohort, 80.2% had a clinician-assessed Karnofsky Performance Status (KPS) score ≥ 80. GA-identified impairments (Timed Up and Go ≥ 14 seconds and dependence in ≥ 1 instrumental activity of daily living [IADL]) were seen in 29.8% and 35.6%, respectively, with 13.5% reporting ≥ 1 fall in the prior 6 months. Polypharmacy (≥ 5 medications) was identified in 80.0%. Self-reported physical and cognitive impairments on QLQ-C30 were described by 48.7% and 20.2%, respectively. Patients with functional deficits had worse EORTC QoL scores compared to those without deficits: dependence in ≥ 1 IADL (mean QoL score 66.3 vs. 79.9, p = 0.0009), ≥ 1 fall (56.7 vs. 76.8, p = 0.0009), self-reported physical impairment on QLQ-C30 (64.0 vs. 84.5, p < 0.0001), and self-reported cognitive impairment on QLQ-C30 (61.2 vs. 77.7, p = 0.0012). Conclusions: Using a modified CARG GA and the EORTC QLQ-C30, we identified physical and cognitive impairments among adults undergoing treatment for PCDs. GA-identified impairments in physical function were more prevalent than clinician-assessed KPS would suggest. Patients with physical and cognitive impairments had worse QoL scores than those without deficits. Future research involving this cohort will investigate the longitudinal trajectory of physical and cognitive functioning, evaluate trends in QoL measurements, and test the feasibility of implementing GA-guided interventions for this population.
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Affiliation(s)
| | - Kirsten A. Nyrop
- University of North Carolina Lineberger Comprehensive Cancer Center, Chapel Hill, NC
| | - Sanah Vohra
- University of North Carolina Lineberger Comprehensive Cancer Center, Chapel Hill, NC
| | - Allison Mary Deal
- University of North Carolina Lineberger Comprehensive Cancer Center, Chapel Hill, NC
| | - Hyman B. Muss
- University of North Carolina School of Medicine, Chapel Hill, NC
| | - Eben I. Lichtman
- The University of North Carolina at Chapel Hill-Lineberger Comprehensive Cancer Center, Chapel Hill, NC
| | - Samuel M. Rubinstein
- The University of North Carolina at Chapel Hill-Lineberger Comprehensive Cancer Center, Chapel Hill, NC
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Grant SJ, Jansen M, Tuchman S, Rubinstein SM, Lichtman EI, Charlot M. Social vulnerability and clinical trial access for older adults with myeloma in North Carolina. J Clin Oncol 2021. [DOI: 10.1200/jco.2021.39.15_suppl.e18540] [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] [Indexed: 11/20/2022] Open
Abstract
e18540 Background: Multiple myeloma (MM) is a disease of aging, associated with one of the greatest black-white disparities in incidence and mortality among all US cancer types. Clinical trials provide the critical evidence-base to inform clinical management in all cancers, including MM. However, clinical trial participants are often younger (age < 65 years) and white, limiting the generalizability of published data to real-world MM care. Although geographical and financial barriers to clinical trial participation are well recognized, less is known about the association of county-level social vulnerability with MM trial availability. We examined county-level variation in the number of registered myeloma trials per 10,000 North Carolina (NC) residents age ≥ 65 years as a function of social vulnerability and the presence of a National Cancer Institute Comprehensive Cancer Center (CCC). Methods: We conducted a cross-sectional study using data from ClinicalTrials.gov to identify all registered interventional myeloma trials involving adults age ≥ 65 years with sites in NC. Records were downloaded on January 24th, 2021. This strategy yielded 456 non-unique NC sites for 223 trials. We obtained county locations for all trial sites by matching city, zip code, or institution name. We obtained NC population data for residents age ≥ 65 years (in 2019) from the American Community Survey. The four themes (socioeconomic status, household composition, ethnic and racial minority status/language, housing/transportation) within the Centers for Disease Control Social Vulnerability Index (CDC SVI) (composite score: 0-1, with a higher number indicating more vulnerability) were used to characterize county-level social vulnerability. We performed negative binomial regression and tabulations using R, version 3.6.1. A p-value < 0.05 was considered statistically significant. Results: Across 100 counties in NC, trial site counts by county per 10,000 residents age ≥ 65 years ranged from 0 to 23.2 (mean: 1.5, median: 0; IQR, 0-0.7). Controlling for the 4 SVI themes, counties with CCCs (Durham, Forsyth, Orange) had 77% more trials than those without CCCs [Incidence Rate Ratio (IRR): 7.74; p = 0.05]. We observed a 3.3% reduction in trial counts with each percentile increase in socioeconomic vulnerability (IRR: 0.97; p = 0.008). Counties with higher representation by racial and ethnic minorities had similar trial site counts to counties with lower minority populations (IRR: 1.01; p = 0.08). Sub-group analyses of early-stage studies (phase 1/2 and phase 2; n = 268) and late-stage studies (phase 2/3 and phase 3; n = 168) were similar. Conclusions: Our preliminary results suggest county-level socioeconomic status is associated with the distribution of MM clinical trial sites across NC. Further work is planned to explore whether additional variances in trial distribution could be explained by site- and study-specific characteristics.
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Affiliation(s)
- Shakira Jeanene Grant
- The University of North Carolina at Chapel Hill-Lineberger Comprehensive Cancer Center, Chapel Hill, NC
| | - Matthew Jansen
- University Libraries, The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Sascha Tuchman
- The University of North Carolina at Chapel Hill-Lineberger Comprehensive Cancer Center, Chapel Hill, NC
| | - Samuel M. Rubinstein
- The University of North Carolina at Chapel Hill-Lineberger Comprehensive Cancer Center, Chapel Hill, NC
| | - Eben I. Lichtman
- The University of North Carolina at Chapel Hill-Lineberger Comprehensive Cancer Center, Chapel Hill, NC
| | - Marjory Charlot
- The University of North Carolina at Chapel Hill, Chapel Hill, NC
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10
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Lichtman EI, Du H, Shou P, Song F, Suzuki K, Ahn S, Li G, Ferrone S, Su L, Savoldo B, Dotti G. Preclinical Evaluation of B7-H3-specific Chimeric Antigen Receptor T Cells for the Treatment of Acute Myeloid Leukemia. Clin Cancer Res 2021; 27:3141-3153. [PMID: 33531429 DOI: 10.1158/1078-0432.ccr-20-2540] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 12/01/2020] [Accepted: 01/28/2021] [Indexed: 12/17/2022]
Abstract
PURPOSE The development of safe and effective chimeric antigen receptor (CAR) T-cell therapy for acute myeloid leukemia (AML) has largely been limited by the concomitant expression of most AML-associated surface antigens on normal myeloid progenitors and by the potential prolonged disruption of normal hematopoiesis by the immunotargeting of these antigens. The purpose of this study was to evaluate B7-homolog 3 (B7-H3) as a potential target for AML-directed CAR T-cell therapy. B7-H3, a coreceptor belonging to the B7 family of immune checkpoint molecules, is overexpressed on the leukemic blasts of a significant subset of patients with AML and may overcome these limitations as a potential target antigen for AML-directed CAR-T therapy. EXPERIMENTAL DESIGN B7-H3 expression was evaluated on AML cell lines, primary AML blasts, and normal bone marrow progenitor populations. The antileukemia efficacy of B7-H3-specific CAR-T cells (B7-H3.CAR-T) was evaluated using in vitro coculture models and xenograft models of disseminated AML, including patient-derived xenograft models. The potential hematopoietic toxicity of B7-H3.CAR-Ts was evaluated in vitro using colony formation assays and in vivo in a humanized mouse model. RESULTS B7-H3 is expressed on monocytic AML cell lines and on primary AML blasts from patients with monocytic AML, but is not significantly expressed on normal bone marrow progenitor populations. B7-H3.CAR-Ts exhibit efficient antigen-dependent cytotoxicity in vitro and in xenograft models of AML, and are unlikely to cause unacceptable hematopoietic toxicity. CONCLUSIONS B7-H3 is a promising target for AML-directed CAR-T therapy. B7-H3.CAR-Ts control AML and have a favorable safety profile in preclinical models.
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Affiliation(s)
- Eben I Lichtman
- Division of Hematology, Department of Medicine, University of North Carolina, Chapel Hill, North Carolina. .,Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina
| | - Hongwei Du
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina.,Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina
| | - Peishun Shou
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina.,Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina
| | - Feifei Song
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina.,Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina
| | - Kyogo Suzuki
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina.,Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina
| | - Sarah Ahn
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina.,Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina
| | - Guangming Li
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina.,Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina
| | - Soldano Ferrone
- Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Lishan Su
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina.,Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina
| | - Barbara Savoldo
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina.,Department of Pediatrics, University of North Carolina, Chapel Hill, North Carolina
| | - Gianpietro Dotti
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina.,Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina
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11
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Lichtman EI, Seldin DC, Shelton A, Sanchorawala V. Single agent lenalidomide three times a week induces hematologic responses in AL amyloidosis patients on dialysis. Am J Hematol 2014; 89:706-8. [PMID: 24668858 DOI: 10.1002/ajh.23722] [Citation(s) in RCA: 3] [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: 02/13/2014] [Revised: 03/11/2014] [Accepted: 03/23/2014] [Indexed: 11/06/2022]
Abstract
The combination of lenalidomide and dexamethasone can produce hematologic responses in previously treated patients with AL amyloidosis. Because lenalidomide is primarily excreted unchanged by the kidney, adjustments to the starting dose of lenalidomide are recommended to provide appropriate drug exposure in patients with moderate or severe renal impairment and in patients on dialysis. Here, we report on a study of patients with AL amyloidosis on dialysis treated with lenalidomide at a dose of 10 mg orally three times a week. Seven patients were enrolled. All patients had received prior treatment, with 57% receiving prior high-dose melphalan and stem cell transplantation. Two patients died before evaluation of response. The most common adverse event was infection; no thromboembolic complications were seen. One patient required dose-modification. Hematologic responses were obtained by four of the five evaluable patients. Median overall survival was 18 months. In conclusion, adjusted dose lenalidomide was reasonably tolerated and induced sustained hematologic responses in previously treated patients with AL amyloidosis on dialysis.
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Affiliation(s)
- Eben I. Lichtman
- Amyloidosis Center; Boston University School of Medicine, Boston Medical Center; Boston Massachusetts
| | - David C. Seldin
- Amyloidosis Center; Boston University School of Medicine, Boston Medical Center; Boston Massachusetts
| | - Anthony Shelton
- Amyloidosis Center; Boston University School of Medicine, Boston Medical Center; Boston Massachusetts
| | - Vaishali Sanchorawala
- Amyloidosis Center; Boston University School of Medicine, Boston Medical Center; Boston Massachusetts
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12
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Jung DY, Ko HJ, Lichtman EI, Lee E, Lawton E, Ong H, Yu K, Azuma Y, Friedline RH, Lee KW, Kim JK. Short-term weight loss attenuates local tissue inflammation and improves insulin sensitivity without affecting adipose inflammation in obese mice. Am J Physiol Endocrinol Metab 2013; 304:E964-76. [PMID: 23482446 PMCID: PMC3651644 DOI: 10.1152/ajpendo.00462.2012] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Obesity is a major cause of insulin resistance, and weight loss is shown to improve glucose homeostasis. But the underlying mechanism and the role of inflammation remain unclear. Male C57BL/6 mice were fed a high-fat diet (HFD) for 12 wk. After HFD, weight loss was induced by changing to a low-fat diet (LFD) or exercise with continuous HFD. The weight loss effects on energy balance and insulin sensitivity were determined using metabolic cages and hyperinsulinemic euglycemic clamps in awake mice. Diet and exercise intervention for 3 wk caused a modest weight loss and improved glucose homeostasis. Weight loss dramatically reduced local inflammation in skeletal muscle, liver, and heart but not in adipose tissue. Exercise-mediated weight loss increased muscle glucose metabolism without affecting Akt phosphorylation or lipid levels. LFD-mediated weight loss reduced lipid levels and improved insulin sensitivity selectively in liver. Both weight loss interventions improved cardiac glucose metabolism. These results demonstrate that a short-term weight loss with exercise or diet intervention attenuates obesity-induced local inflammation and selectively improves insulin sensitivity in skeletal muscle and liver. Our findings suggest that local factors, not adipose tissue inflammation, are involved in the beneficial effects of weight loss on glucose homeostasis.
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Affiliation(s)
- Dae Young Jung
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA
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13
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Lichtman EI, Helfgott SM, Kriegel MA. Emerging therapies for systemic lupus erythematosus--focus on targeting interferon-alpha. Clin Immunol 2012; 143:210-21. [PMID: 22525889 DOI: 10.1016/j.clim.2012.03.005] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Revised: 03/30/2012] [Accepted: 03/30/2012] [Indexed: 12/20/2022]
Abstract
Current therapies for systemic lupus erythematosus (SLE), a debilitating, potentially lethal, multifactorial systemic autoimmune disease, are limited to suppressing disease activity and are associated with multiple adverse effects. Recent advances in basic and translational sciences have elucidated a crucial role for the interferon-alpha (IFNα) pathway in the pathogenesis of this enigmatic disease. The so-called "type I interferon signature" has emerged as a major risk factor for disease activity of SLE. Multiple genes encoding for molecules within the type I interferon pathway have been associated with SLE in genome wide association studies. In addition, innate immune receptors are thought to be triggered by either endogenous and/or exogenous stimuli that lead to hypersecretion of IFNα. We review the multiple emerging treatment strategies targeting IFNα-related pathways. These include monoclonal antibodies against IFNα, anti-IFNα antibody-inducing vaccines, and inhibitors of Toll-like receptors. We also summarize the current status of these pharmaceutical agents in early clinical trials.
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Affiliation(s)
- Eben I Lichtman
- Division of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
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14
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Affiliation(s)
| | - Eben I. Lichtman
- Department of Chemistry and Biochemistry, Oberlin College, Oberlin, Ohio 44074
| | - Amelia B. Hadler
- Department of Chemistry and Biochemistry, Oberlin College, Oberlin, Ohio 44074
| | - Matthew J. Elrod
- Department of Chemistry and Biochemistry, Oberlin College, Oberlin, Ohio 44074
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15
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Abstract
The products of the primary OH-initiated oxidation of toluene were investigated using the turbulent flow chemical ionization mass spectrometry technique at temperatures ranging from 228 to 298 K. A major dienedial-producing pathway was detected for the first time for toluene oxidation, and glyoxal and methylglyoxal were found to be minor primary oxidation products. The results suggest that secondary oxidation processes involving dienedial and epoxide primary products are likely responsible for previous observations of glyoxal and methylglyoxal products from toluene oxidation. Because the dienedial-producing pathway is a null cycle for tropospheric ozone production and glyoxal and methylglyoxal are important secondary organic aerosol precursors, these new findings have important implications for the modeling of toluene oxidation in the atmosphere.
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Affiliation(s)
- Cristian O Baltaretu
- Department of Chemistry and Biochemistry, Oberlin College, Oberlin, Ohio 44074, USA
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