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GLUT1 as a Prognostic Factor for Classical Hodgkin’s Lymphoma: Correlation with PD-L1 and PD-L2 Expression
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Original Article
GLUT1 as a Prognostic Factor for Classical Hodgkin’s Lymphoma: Correlation with PD-L1 and PD-L2 Expression
Young Wha Koh, Jae-Ho Han, Seong Yong Park1, Dok Hyun Yoon2, Cheolwon Suh2, Jooryung Huh,3
Journal of Pathology and Translational Medicine 2017;51(2):152-158.
DOI: https://doi.org/10.4132/jptm.2016.11.03
Published online: February 21, 2017

Department of Pathology, Ajou University School of Medicine, Suwon, Korea

1Department of Thoracic and Cardiovascular Surgery, Ajou University School of Medicine, Suwon, Korea

2Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea

3Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea

Corresponding Author Jooryung Huh, MD Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea Tel: +82-2-3010-4553 Fax: +82-2-472-7898 E-mail: 'jrhuh@amc.seoul.kr'
• Received: August 23, 2016   • Revised: October 17, 2016   • Accepted: November 3, 2016

© 2017 The Korean Society of Pathologists/The Korean Society for Cytopathology

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Background
    Glucose transporter type 1 (GLUT1) expression is linked to glucose metabolism and tissue hypoxia. A recent study reported that GLUT1 was significantly associated with programmed death ligand 1 (PD-L1) as a therapeutic target in relapsed or refractory classical Hodgkin’s lymphoma (cHL). The purpose of this study was to measure the expression of GLUT1 and assess its prognostic significance and potential relationships with PD-L1, programmed death ligand 2 (PD-L2), and programmed death-1 (PD-1) expressions in cHL.
  • Methods
    Diagnostic tissues from 125 patients with cHL treated with doxorubicin, bleomycin, vinblastine, and dacarbazine were evaluated retrospectively via immunohistochemical analysis of GLUT1, PD-L1, PD-L2, and PD-1 expression.
  • Results
    The median follow-up time was 4.83 years (range, 0.08 to 17.33 years). GLUT1, PD-L1, PD-L2, and PD-1 were expressed in 44.8%, 63.2%, 9.6%, and 13.6% of the specimens, respectively. Positive correlations were found between GLUT1 and PD-L1 expression (p = .004) and between GLUT1 and PD-L2 expression (p = .031). GLUT1 expression in Hodgkin/Reed-Sternberg (HRS) cells was not associated with overall survival or event-free survival (EFS) in the entire cohort (p = .299 and p = .143, respectively). A subgroup analysis according to the Ann Arbor stage illustrated that GLUT1 expression in HRS cells was associated with better EFS in advanced-stage disease (p = .029). A multivariate analysis identified GLUT1 as a marginally significant prognostic factor for EFS (p = .068).
  • Conclusions
    This study suggests that GLUT1 expression is associated with better clinical outcomes in advanced-stage cHL and is significantly associated with PD-L1 and PD-L2 expressions.
Classical Hodgkin lymphoma (cHL) is considered a highly curable disease with modern therapy; however, at least 20% of the patients cannot be cured with the standard treatment [1,2]. Although the International Prognostic Score (IPS) is a powerful tool for risk stratification, it does not fully reflect the biological nature of cHL. Furthermore, the prognostic significance of IPS is limited in advanced-stage disease [3].
Glucose transporter type 1 (GLUT1) is responsible for the cellular glucose uptake, and it is often overexpressed in malignant tumors, which are characterized by an increased glycolytic rate to meet the intense energy requirements for cell proliferation [4]. GLUT1 overexpression has been correlated with a poor prognosis in several cancers including the lung [5], breast [6], colon [7], and stomach cancers [8]. Although GLUT1 expression was evaluated in cHL [9,10], it was not associated with clinical outcomes in a previous study [9]. Some cancer prediction systems such as the IPS are useful only for certain stages; however, previous studies did not perform subgroup analyses according to the Ann Arbor stage.
The programmed death-1 (PD-1) pathway has emerged as an important mechanism for tumor evasion from anti-tumor immune responses [11]. Two ligands for PD-1, programmed death ligand 1 (PD-L1) and programmed death ligand 2 (PD-L2), act as negative immune regulators via interactions with the PD-1 receptor [12]. PD-1/PD-L1 and PD-L2 have been reported as prognostic biomarkers for hepatocellular carcinoma [13], urothelial carcinoma [14], breast cancer [15], lung cancer [16], and colorectal cancer [17].
Hypoxia-inducible factors (HIFs) play an important role in tumor immune responses [18]. HIF-1a and HIF-2α stabilized by hypoxia promote the expression of PD-L1 via binding to a specific hypoxia-response element in the promoter of PD-L1 in myeloid-derived suppressor cells, dendritic cells, and macrophages, as well as in prostate, breast, and colorectal cancer cell lines [19-22]. It will be interesting to evaluate the relationship between GLUT1 and PD-L1 because GLUT1 is a well-known target gene of the HIF pathways [19,22,23]. A recent study reported that PD-L1 expression is regulated by GLUT1 in clear cell renal cell carcinoma [24]. An anti–PD-1 monoclonal antibody (nivolumab) has exhibited substantial therapeutic activity and an acceptable safety profile in relapsed or refractory cHL [25]. A GLUT1-specific inhibitor (STF-31) also suppressed glucose uptake and induced apoptosis in myeloma cells with high GLUT1 expression [26]. However, no study has examined the relationship between PD-L1 and GLUT1 in patients with cHL. This retrospective study evaluated the expression of GLUT1 and assessed its prognostic significance and potential relationships with PD-L1, PD-L2, and PD-1 expressions in cHL.
Patients
A retrospective analysis of 125 consecutive patients diagnosed with cHL at Asan Medical Center between 1995 and 2012 and at Ajou University Hospital between 2008 and 2015 was performed. All patients were pathologically confirmed to have cHL and treated with the doxorubicin, bleomycin, vinblastine, and dacarbazine (ABVD) therapy regimen, with or without radiation. The patients were ≥15 years of age at diagnosis, and they had no previous treatment or history of malignancy. Paraffin-embedded tumor tissues and follow-up data were available for all patients included in the study. The median follow-up time was 4.83 years (range, 0.08 to 17.33 years). Response criteria were based on standard guidelines. Routine follow-up imaging analyses were performed every 3 months for the first 2 years, every 6 months for the next 3 years, and annually (or whenever clinically indicated) thereafter. The results of PD-L1, PD-L2, and PD-1 expressions from a previously reported study were used [27]. The research was approved by the Institutional Review Board of Asan Medical Center.
Histopathological analysis and immunohistochemistry
All histological and immunophenotypic data were reviewed by two pathologists (J.H. and Y.W.K.). The cases of cHL were subtyped according to the World Health Organization criteria as nodular sclerosis, lymphocyte-rich, mixed cellularity, lymphocyte-depleted, or not otherwise specified cHL. Tissue microarrays (TMAs) were constructed using three 1-mm-diameter tumor cores from selected areas of formalin-fixed, paraffin-embedded tumor samples. TMA sections were stained using a Benchmark XT automatic immunohistochemistry staining device (Ventana Medical Systems, Tucson, AZ, USA). Anti-GLUT1 (Cell Marque, Rocklin, CA, USA), anti–PD-L1 (Cell Signaling Technology, Danvers, MA, USA), anti–PD-L2 (R&D Systems, Minneapolis, MN, USA), and anti–PD-1 antibodies (Cell Marque) were used. In the TMA, each case was represented by three tissue cores, and at least 10 CD30-positive Hodgkin/Reed-Sternberg (HRS) cells in at least one of the three core cylinders from each patient were read. To minimize the counting of cells, other than small lymphocytes, with nonspecific PD-1 staining we counted only the cells with staining that were morphologically compatible with small lymphocytes in the microenvironment (excluded fibroblasts, endothelial cells, HRS cells, and macrophages) based on their size, shape, and CD30 staining. We examined the protein expression of GLUT1, PD-L1, PD-L2, and PD-1 in 5% increments. The cut-off values of GLUT1, PD-L1, PD-L2, and PD-1 associated with the most significant differences in overall survival (OS) were selected. A sample was considered GLUT1-, PD-L1–, or PD-L2–positive if the expression of these markers was detected in ≥ 20% of HRS cells. A sample was considered PD-1–positive if PD-1 expression was detected in ≥20% of the peritumoral microenvironment. In situ hybridization analysis of Epstein-Barr virus–encoded RNA-1 and RNA-2 was performed and scored as previously described [28].
Statistical analyses
Event-free survival (EFS) was defined as the interval between the date of diagnosis and that of disease progression, relapse, or death from any cause. OS was defined as the interval between the date of diagnosis and that of death from any cause. The follow-up of patients was censored at their last follow-up date. Cumulative OS or EFS was analyzed using the Kaplan-Meier method, and comparisons were performed via log-rank testing. Multivariate prognostic analyses was performed with the Cox proportional hazards regression model using the enter method. Categorical variables were compared using the chi-squared test. All statistical analyses were performed using the SPSS statistical software program ver. 18.0 (SPSS Inc., Chicago, IL, USA). All p-values were two-sided associations, and p<.05 was considered statistically significant.
Patient characteristics
The clinical characteristics of the 125 patients are summarized in Table 1. The median age of the patients was 39 years (range, 15 to 78 years). Twenty-five patients died. The median OS was not achieved, and the median EFS was 11 years. The estimated 5-year OS and EFS rates were 84% and 61%, respectively.
GLUT1 expression in cHL tissues
The correlations between GLUT1 and clinical variables are summarized in Table 2. Fifty-six patients (44.8%) displayed membranous positivity for GLUT1 (Fig. 1A). There was no correlation between GLUT1 expression and clinical variables.
Correlations of PD-L1, PD-L2, and PD-1 expression with GLUT1 expression
PD-L1, PD-L2, and PD-1 were expressed in 63.2%, 9.6%, and 13.6% of the specimens, respectively (Fig. 1BD). The correlations of PD-L1, PD-L2, and PD-1 expression with GLUT1 expression are summarized in Table 3. GLUT1 protein expression was associated with high PD-L1 (p=.004) and high PD-L2 protein expression in HRS cells (p=.031). However, there was no correlation between GLUT1 levels in HRS cells and PD-1 expression in the peritumoral microenvironment (p=.198).
Prognostic significance of GLUT1 expression
GLUT1 expression was not associated with EFS and OS rates (p=.143 and p=.299, respectively). As the prognostic significance of the IPS is limited in advanced-stage disease [3], we performed a subgroup analysis according to the disease stage to determine whether GLUT1 expression has prognostic significance in certain stages. In limited-stage cHL, GLUT1 expression was not associated with EFS and OS rates (p=.906 and p=.833, respectively). In advanced-stage cHL, GLUT1 positivity was associated with better EFS (p=.029) (Fig. 2A). However, there was no association between GLUT1 expression and OS in advanced-stage cHL (p=.168) (Fig. 2B).
Univariate analysis revealed that EFS was associated with advanced age and anemia (Table 4). Multivariate analysis identified GLUT1 as a marginally significant prognostic factor for EFS, together with advanced age and anemia (hazard ratio, 0.462; p=.068) (Table 4).
In the present study, the expression of GLUT1 was significantly correlated with PD-L1 and PD-L2 expression, supporting the hypothesis that GLUT1-related signaling pathways play an important role in the PD-L1 or PD-L2 pathway. In particular, GLUT1 expression was marginally associated with better EFS in advanced-stage cHL.
There are several explanations for the relationships between PD-1 pathways and GLUT1 expression. HIF-2α overexpression stabilized by hypoxia increased PD-L1 mRNA and protein levels in a kidney clear cell carcinoma cell line [19]. A previous study also revealed the direct binding of HIF-2α to a transcriptionally active hypoxia-response element in the human PD-L1 proximal promoter [19]. GLUT1 is an important downstream target of HIF-2α [19,22]. Therefore, a significant correlation between GLUT1 and PD-L1 expression was identified in clear cell renal cell carcinoma [24]. In our study, 91% of patients with GLUT1-positive status had PD-L1 positive status, supporting the HIF-2α–Glut1–PD-L1 pathway identified in a previous study. However, 48% of patients with PD-L1–positive status had GLUT1 negative status. Further studies are needed to confirm the precise mechanism of the PD-L1 pathway, regardless of GLUT1 expression, in patients with cHL.
In the present study, GLUT1 expression was associated with better EFS in advanced-stage cHL, although the result was of borderline statistical significance. GLUT1 expression was not associated with EFS or OS rates in the entire patient cohort. Hartmann et al. [9] reported no prognostic significance for GLUT1 expression in cHL. However, Hartmann et al. [9] did not perform subgroup analysis according to the Ann Arbor stage. Some prognostic biomarkers have limited importance in certain clinical stages. The IPS also has prognostic significance in advanced-stage cHL. Moreover, further research is needed to confirm the prognostic impact of GLUT1 expression.
Although our results revealed a favorable clinical outcome in patients with GLUT1-positive advanced-stage cHL, previous studies revealed correlations between high GLUT1 expression and poor survival in other solid malignancies [5-8]. In the present study, all patients received the ABVD regimen. Doxorubicin and vinblastine are associated with DNA damage. Doxorubicin inhibits the progression of the enzyme topoisomerase II, which relaxes supercoils in DNA for transcription [29]. Vinblastine can suppress microtubule dynamics, resulting in mitotic block and apoptosis [30]. Therefore, HRS cells with higher proliferation rates would be more susceptible to chemotherapy-associated DNA damage. GLUT1 overexpression increases glucose metabolism in tumors to enhance cellular proliferation in melanoma and gastric cancer [31,32]. Some studies ascribed the superior survival of patients with diffuse large B-cell lymphoma or cHL to increased sensitivity to chemotherapy due to higher cell proliferation rates [33,34]. Although we did not examine the proliferation rates of HRS cells in our series, the superior survival of cHL patients with GLUT1 expression in our study may imply higher proliferation rates of HRS cells.
Differential expression of GLUT1 was detected according to the histologic type of cHL in a previous study [9]. GLUT1 expression was more rarely observed in HRS cells in the lymphocyterich classical cHL subtype (30%) than in the nodular sclerosis (56%), mixed cellularity (41%), or lymphocyte-depleted subtype (100%). Our series also identified lower expression of GLUT1 in the lymphocyte-rich classical cHL subtype (0%) than in other subtypes.
A GLUT1-specific inhibitor (STF-31) induces apoptosis and sensitizes multiple myeloma cells to conventional chemotherapeutic agents [26]. A recent study found that the GLUT1-specific inhibitor apigenin induces growth retardation and apoptosis through metabolic and oxidative stress caused by the suppression of glucose utilization in lung cancer and adenoid cystic carcinoma [35]. WZB117 also exerts inhibitory effects on cancer cell growth in breast and lung cancer cell lines [36,37]. Nivolumab has been tested in patients with advanced cHL, and impressive results were obtained in phase I trial [25]. Pembrolizumab, an IgG4 monoclonal antibody directed against PD-1, also induced favorable responses in a heavily pretreated patient with cHL [38]. Although an objective response was reported in 87% of patients with advanced cHL treated with nivolumab, only 17% of patients exhibited complete responses [25]. Based on the significant correlations of GLUT1 with PD-L1 and PD-L2 in this study and a previous study [24], the HIF-2α–GLUT1–PD-L1 pathway may be efficiently inhibited by GLUT1-specific inhibitor and PD-1–specific inhibitor.
In summary, our results suggest that GLUT1 expression is significantly associated with the expression of PD-L1 and PD-L2. GLUT1 expression has prognostic significance in advanced-stage cHL. Further efforts to understand the mechanisms of the correlations of GLUT1 with PD-L1 and PD-L2 may help the development of effective therapeutic agents for the treatment of cHL.

Conflicts of Interest

No potential conflict of interest relevant to this article was reported.

This research was supported by a grant from The Korean Society of Pathologists.
Fig. 1.
Glucose transporter type 1 (GLUT1), programmed death ligand 1 (PD-L1), programmed death ligand 2 (PD-L2), and programmed death-1 (PD-1) expression in classical Hodgkin’s lymphoma tissues. (A) High GLUT1 expression in Hodgkin/Reed–Sternberg (HRS) cells (≥ 20%). (B) High PD-L1 expression in HRS cells (≥20%). (C) High PD-L2 expression in HRS cells (≥20%). (D) High PD-1 expression in the peritumoral microenvironment (≥20%).
jptm-2016-11-03f1.gif
Fig. 2.
Comparison of survival rates according to glucose transporter type 1 (GLUT1) expression in advanced-stage classical Hodgkin’s lymphoma. The event-free survival rate is significantly higher in the GLUT1-positive group than in the GLUT1-negative group (A). GLUT1 expression is not significantly associated with the overall survival rate (B).
jptm-2016-11-03f2.gif
Table 1.
Demographic and clinical characteristics of patients
Characteristics at diagnosis No. of patients (%)
Age, median (range, yr) 39 (15–78)
Male gender 74 (59.2)
Histologic subtype
 Nodular sclerosis 83 (66.4)
 Mixed cellularity 27 (21.6)
 Lymphocyte-rich 6 (4.8)
 Lymphocyte-depleted 3 (2.4)
 Not classifiable 6 (4.8)
Ann Arbor stage
 I 26 (20.8)
 II 41 (32.8)
 III 29 (23.2)
 IV 29 (23.2)
Stage (limited vs advanced)
 Limited 48 (38.4)
 Advanced 77 (61.6)
B symptoms present 41 (32.8)
International Prognostic Score ≥ 3 (high-risk) 49 (39.2)
EBER positivity 49 (39.2)
Primary treatment
 Chemotherapy 95 (76.0)
 Chemoradiotherapy 30 (24.0)

EBER, Epstein-Barr virus–encoded RNA-1 and RNA-2 assessed by in situ hybridization.

Table 2.
Correlations between clinical variables and GLUT1 expression in all cases
Characteristic GLUT1 expression
p-value
Low (< 20%) (n = 69) High (≥ 20%) (n = 56)
Age (yr) .858a
 <45 38 (55.1) 32 (57.1)
 ≥45 31 (44.9) 24 (42.9)
Gender .276a
 Male 44 (63.8) 30 (53.6)
 Female 25 (36.2) 26 (46.4)
Disease subtype .182b
 Nodular sclerosis 43 (62.3) 40 (71.4)
 Mixed cellularity 14 (20.3) 13 (23.2)
 Lymphocyte-rich 6 (8.7) 0
 Lymphocyte-depleted 2 (2.9) 1 (1.8)
 Not classifiable 4 (5.8) 2 (3.6)
B symptom .184a
 Absent 50 (72.5) 34 (60.7)
 Present 19 (27.5) 22 (39.3)
Ann Arbor stage .586a
 Limited 28 (40.6) 20 (35.7)
 Advanced 41 (59.4) 36 (64.3)
IPS .467a
 < 3 44 (63.8) 32 (57.1)
 ≥ 3 25 (36.2) 24 (42.9)
EBER .467a
 Negative 44 (63.8) 32 (57.1)
 Positive 25 (36.2) 24 (42.9)
Primary treatment .674a
 Chemotherapy 51 (73.9) 44 (78.6)
 Chemoradiotherapy 18 (26.1) 12 (21.4)

Values are presented as number (%).

GLUT1, glucose transporter 1; IPS, International Prognostic Score; EBER, Epstein-Barr virus-encoded RNA-1 and RNA-2 assessed by in situ hybridization.

a Chi-squared test by two-sided Pearson’s test;

b Chi-squared test by two-sided Fisher test.

Table 3.
Correlations between GLUT1, PD-L1, PD-L2, and PD-1 expression in all cases
Characteristic GLUT1 expression
p-value
Low (< 20%) (n = 69) High (≥ 20%) (n = 56)
PD-L1 expression in HRS cells .004a
 Low (< 20%) 19 (33.3) 4 (8.9)
 High (≥ 20%) 38 (66.7) 41 (91.1)
PD-L2 expression in HRS cells .299a
 Low (< 20%) 54 (94.7) 36 (80.0)
 High (≥ 20%) 3 (5.3) 9 (20.0)
PD-1 expression in peritumoral microenvironment .198a
 Low (< 20%) 57 (82.6) 51 (91.1)
 High (≥ 20%) 12 (17.4) 5 (8.9)

Values are presented as number (%).

GLUT1, glucose transporter type 1; PD-L1, programmed death ligand 1; PD-L2, programmed death ligand 2; PD-1, programmed death-1; HRS, Hodgkin/Reed–Sternberg.

a Chi-squared test by two-sided Pearson’s test.

Table 4.
Univariate and multivariate analysis of event-free survival in advanced stage
Covariate HR 95% CI p-valuea
Univariate analysis
 Age < 45 yr vs ≥ 45 yr 3.22 1.47–7.05 .003
 Sex Female vs male 1.52 0.72–3.20 .271
 B symptoms (–) vs (+) 1.85 0.86–3.96 .112
 EBER (–) vs (+) 1.64 0.94–2.85 .081
 Lymphopenia (–) vs (+) 1.32 0.31–5.55 .706
 Leukocytosis (–) vs (+) 1.38 0.46–4.14 .563
 Hypoalbuminemia (–) vs (+) 1.65 0.62–4.31 .311
 Anemia (–) vs (+) 2.31 1.07–4.94 .032
 GLUT1 expression (-) vs (+) 0.42 0.18–0.94 .035
Multivariate analysis
 Age < 45 yr vs ≥ 45 yr 2.47 1.08–5.61 .031
 Anemia (–) vs (+) 1.92 0.86–4.24 .107
 GLUT1 expression (–) vs (+) 0.46 0.20–1.05 .068

HR, hazard ratio; CI, confidence interval; EBER, Epstein-Barr virus–encoded RNA-1 and RNA-2 assessed by in situ hybridization; GLUT1, glucose transporter 1.

a Cox univariate analysis.

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      GLUT1 as a Prognostic Factor for Classical Hodgkin’s Lymphoma: Correlation with PD-L1 and PD-L2 Expression
      J Pathol Transl Med. 2017;51(2):152-158.   Published online February 21, 2017
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