An increase in myocardial 18-fluorodeoxyglucose uptake is associated with left ventricular ejection fraction decline in Hodgkin lymphoma patients treated with anthracycline
Journal of Translational Medicine volume 16, Article number: 295 (2018)
Doxorubicin (DOX)-based chemotherapy for Hodgkin lymphoma (HL) yields excellent disease-free survival, but poses a substantial risk of subsequent left ventricular (LV) dysfunction and heart failure, typically with delayed onset. At the cellular level, this cardiotoxicity includes deranged cardiac glucose metabolism.
By reviewing the hospital records from January 2008 through December 2016, we selected HL patients meeting the following criteria: ≥ 18 year-old; first-line DOX-containing chemotherapy; no diabetes and apparent cardiovascular disease; 18-fluoro-deoxyglucose positron emission tomography (18FDG-PET) scans before treatment (PETSTAGING), after 2 cycles (PETINTERIM) and at the end of treatment (PETEOT); at least one echocardiography ≥ 6 months after chemotherapy completion (ECHOPOST). We then evaluated the changes in LV 18FDG standardized uptake values (SUV) during the course of DOX therapy, and the relationship between LV-SUV and LV ejection fraction (LVEF), as calculated from the LV diameters in the echocardiography reports with the Teicholz formula.
Forty-three patients (35 ± 13 year-old, 58% males) were included in the study, with 26 (60%) also having a baseline echocardiography available (ECHOPRE). LV-SUV gradually increased from PETSTAGING (log-transformed mean 0.20 ± 0.27) to PETINTERIM (0.27 ± 0.35) to PETEOT (0.30 ± 0.41; P for trend < 0.001). ECHOPOST was performed 22 ± 17 months after DOX chemotherapy. Mean LVEF was normal (68.8 ± 10.3%) and only three subjects (7%) faced a drop below the upper normal limit of 53%. However, when patients were categorized by median LV-SUV, LVEF at ECHOPOST resulted significantly lower in those with LV-SUV above than below the median value at both PETINTERIM (65.5 ± 11.8% vs. 71.9 ± 7.8%, P = 0.04) and PETEOT (65.6 ± 12.2% vs. 72.2 ± 7.0%, P = 0.04). This was also the case when only patients with ECHOPRE and ECHOPOST were considered (LVEF at ECHOPOST 64.7 ± 8.9% vs. 73.4 ± 7.6%, P = 0.01 and 64.6 ± 9.3% vs. 73.5 ± 7.0%, P = 0.01 for those with LV-SUV above vs. below the median at PETINTERIM and PETEOT, respectively). Furthermore, the difference between LVEF at ECHOPRE and ECHOPOST was inversely correlated with LV-SUV at PETEOT (P < 0.01, R2 = − 0.30).
DOX-containing chemotherapy causes an increase in cardiac 18FDG uptake, which is associated with a decline in LVEF. Future studies are warranted to understand the molecular basis and the potential clinical implications of this observation.
Anthracyclines are the cornerstone of many life-saving treatments, and Hodgkin lymphoma (HL) is a paradigm of a curable malignancy also by virtue of anthracycline-based chemotherapy regimens, with optimal treatment providing a 10-year disease-free survival exceeding 80% [1, 2]. Unfortunately, however, anthracyclines are cardiotoxic .
Anthracycline cardiotoxicity may present as left ventricular (LV) dysfunction and heart failure within months or few years after exposure to high cumulative doses of drug, especially in the case of pre-existing cardiovascular disease. Nonetheless, LV dysfunction and heart failure may also develop more insidiously, several years after treatment with only moderate doses of anthracyclines [4,5,6]. This type of cardiotoxicity is typically observed in patients who do not have cardiovascular risk factors or disorders at the time of chemotherapy, such as first-line treated subjects with HL, for whom the incidence of anthracycline-related LV dysfunction may be as high as one in three treated patients .
Predicting late anthracycline cardiotoxicity is challenging. Both biomarkers and echocardiography with speckle tracking analysis or cardiac magnetic resonance imaging have been proposed to identify individuals who may require cardiac monitoring and may benefit from early cardioprotection with drugs such as beta-blockers and angiotensin converting enzyme inhibitors [8,9,10,11]. Yet, these tools are underused in clinical practice as they require additional exams for already overwhelmed patients, need expert personnel for appropriate interpretation of the results and, in some cases, are expensive.
Whole-body 18-fluoro-deoxyglucose positron emission tomography (18FDG-PET) is recommended for HL staging [2, 12]. While the oncologist evaluates 18FDG uptake in the hematopoietic system, this exam may also offer unique information concerning the effects of anthracyclines on the heart. Impaired mitochondrial oxidative metabolism with heightened glycolytic flux is a major feature of anthracycline cardiotoxicity in experimental mouse models [13, 14]; since hexokinase, the rate-limiting enzyme of glycolysis, is also responsible for phosphorylation and intracellular retention of 18FDG, it is expected that myocardial uptake of this tracer increases in response to anthracycline. In fact, previous studies demonstrated a change in LV 18FDG standardized uptake value (LV-SUV) during anthracycline exposure  and it has been hypothesized that 18FDG-PET might detect myocardial toxicity of anthracycline very early . Consistent with this literature, we recently found that 18FDG uptake increases in mice injected with the anthracycline, doxorubicin (DOX), as well as in patients receiving anthracycline-containing chemotherapy, with a direct correlation with a composite endpoint of subsequent cardiac alterations . Here, we sought to expand these findings focusing on LV ejection fraction (EF), because even minor decreases in this parameter were shown to predict clinically relevant anthracycline cardiotoxicity .
This retrospective study included patients affected by HL and referred to the IRCCS San Martino Policlinic Hospital, Genova, Italy, between January 2008 and December 2016. According to the research mission of the hospital and as per approval by the local Institutional Review Board, all subjects signed an informed consent allowing the utilization of their anonymized clinical data for scientific purposes.
By reviewing the medical records, eligible patients were identified based on the following criteria (Fig. 1): age ≥ 18 years; HL receiving first-line chemotherapy with DOX as part of the ABVD or BEACOPP protocols; at least three 18FDG-PET scans available, i.e. before treatment (PETSTAGING), after 2 cycles (PETINTERIM) and at the end of treatment (PETEOT); no diabetes; no more than two major cardiovascular risk factors, no history of cardiac disease and normal ECG at baseline; and transthoracic echocardiography performed ≥ 6 months after DOX exposure (ECHOPOST). Thus, by study design all subjects underwent an echocardiogram 6 or more months after chemotherapy completion. Some patients, however, received more than one post-treatment echocardiogram: in this case, the most recent one was considered (i.e. closest to the time when the retrospective analysis was carried out). When available, data of a baseline echocardiographic evaluation (ECHOPRE) were also taken into account.
18FDG-PET/CT scans were performed using a 16-slice Biograph 16 PET/CT hybrid system (Siemens Medical Solutions). In accordance to standard clinical practice, each patient received an intravenous bolus of 4.8–5.2 MBq/kg 18FDG. PET/CT acquisition started after 60–75 min, during which subjects were recommended to drink water in order to increase the urinary clearance of the unbound 18FDG fraction. The body was scanned from vertex to mid-thigh in arms-up position. The emission scan lasted 120 s per bed position. PET raw data were reconstructed using ordered-subset expectation maximization (OSEM, 3 iterations; 16 subsets), and attenuation was corrected using the raw CT data. 16-detector-row helical CT was performed with non-diagnostic current and voltage settings (120 kV; 80 mA), a gantry rotation speed of 0.5 s, and a table speed of 24 mm per gantry rotation. The entire CT dataset was merged with the three-dimensional PET images using an integrated software interface (Syngo; Siemens Medical Solutions).
Volumes of interest were manually drawn on the metabolically active LV myocardium and on a 2 cm-thick section of longissimus thoracis muscle at the level of 12th vertebral body. When the LV was not clearly identifiable on PET images due to the low myocardial 18FDG uptake, hybrid PET/CT images were used to select the volume of interest. Next, the mean SUV within the LV and skeletal muscle (SM) volumes of interest were measured (LV-SUV and SM-SUV, respectively) and normalized for the circulating 18FDG concentration, as estimated by the mean SUV value in a volume of interest drawn at the level of the inferior vena cava, in order to correct for the noise signal of the blood pool. The ratio between LV-SUV and SM-SUV was then calculated. These analyses were carried out by two nuclear medicine specialists with experience in 18FDG-PET and cardiac imaging, who were blinded to other data.
All patients underwent standard transthoracic echocardiography. LVEF was measured by means of the Teicholz formula by two cardiologists, different from those who selected the study cases and blinded to clinical and nuclear medicine data. Although a LVEF value was written in the echocardiography reports, this parameter was recalculated in order to have standardized and thereby comparable numbers.
Statistical analysis was performed using the statistical package of R-software (ver. 3.4). Data are given as number (percentage of total), mean ± standard deviation or median (interquartile range). LV-SUV and SM-SUV values were normalized by logarithmical transformation. Comparisons were drawn by unpaired or paired Student’s t-test or repeated measures ANOVA, as appropriate, while the relationship between LVEF changes and LV-SUV was assessed by Pearson’s correlation test. The association between LVEF changes and LV-SUV was also examined in a linear regression model with age and DOX dose as covariates, since they can affect LV function. A P value < 0.05 was considered significant.
Sixty-five patients were eligible during the study period, but 22 did not have ECHOPOST, leaving a sample of 43 subjects. For 26 of them (60%), ECHOPRE was available.
The baseline characteristics of the 43 patients are summarized in Table 1. Mean age was 35 ± 13 years, male gender was slightly predominant and the prevalence of cardiovascular risk factors was low. Consistent with the fact that diabetes was a cause of exclusion from the study, mean fasting plasma glucose was normal at baseline (82 ± 9 mg/dL), and remained normal at PETINTERIM (83 ± 10 mg/dL) and PETEOT (86 ± 24 mg/dL). LVEF in the subgroup with ECHOPRE was always within the normal range.
A significant progressive increase in LV-SUV was observed over DOX treatment (Fig. 2), and this trend was confirmed in the subgroup of patients with ECHOPRE (data not shown). SM-SUV also increased during chemotherapy (Fig. 2), thus no significant change occurring in the ratio between LV-SUV and SM-SUV.
ECHOPOST was performed 22 ± 17 (range 6–76) months after DOX chemotherapy. LVEF dropped below the upper normal limit of 53% in 3 (7%) patients, who remained asymptomatic, and mean LVEF in ECHOPOST was normal (68.8 ± 10.3%), as was LV end-diastolic diameter (LVEDD) (47.4 ± 5.1 mm). In the subgroup with both ECHOPRE and ECHOPOST, mean LVEF and LVEDD minimally and non-significantly changed from 69.0 ± 9.3 to 70.3 ± 7.1% (P = 0.43) and from 47.2 ± 5.2 to 46.9 ± 4.9 mm (P = 0.60), respectively.
However, when patients were categorized in high and low LV-SUV by LV-SUV median value, LVEF was significantly lower in those with high vs. low LV-SUV values at both PETINTERIM and PETEOT (Fig. 3). This was also the case when only subjects with ECHOPRE and ECHOPOST were considered (Fig. 4). Interestingly, LVEF at ECHOPRE was similar among LV-SUV categories at any PET scan; consequently, LVEF as measured at ECHOPOST was significantly lower than LVEF at ECHOPRE in patients who had a high LV-SUV at either PETINTERIM or PETEOT (Fig. 4). In addition, the difference between LVEF at ECHOPRE and ECHOPOST was inversely correlated with LV-SUVEOT, the higher being LV-SUVEOT the wider the decrease in LVEF (Fig. 5). The relation between LV-SUVEOT and the magnitude of LVEF change remained significant after adjusting for age and dose of DOX (univariate analysis: β − 14.5, SE 4.6, P = 0.004; after accounting for age and DOX dose: β − 13.7, SE 4.9, P = 0.01).
By contrast, LVEDD was not significantly different among the high and low LV-SUV categories at any PET time point (Table 2).
The present study shows that DOX-containing chemotherapy causes an increase in 18FDG uptake by the normal heart, as defined by clinical assessment, which is associated with a significant decline in LVEF several months to years after treatment completion. These results substantiate an emerging literature putting attention on the effects of anthracyclines on myocardial retention of 18FDG-PET [15,16,17, 19], and raise research and practical prospects.
First, our and other authors’ work prompts the question of which mechanism underlies the higher accumulation of 18FDG in the myocardium exposed to DOX as compared with control conditions. Finding the answer would imply gaining insights into the pathogenesis of DOX cardiotoxicity, which is complex and still to be fully resolved , and possibly laying the foundations for novel strategies to avoid or mitigate cardiac injury.
DOX and other anthracyclines acutely and invariably elicit a triad of alterations in cardiomyocytes—oxidative stress, DNA damage due to topoisomerase II poisoning and mitochondrial derangement . Intriguingly, however, development of gross cardiac abnormalities is delayed, in both the animal model and, to the largest extent, patients [22, 23]. Therefore, anthracycline cardiotoxicity may be schematically divided in immediate molecular and cellular events, which occur right after drug administration, and whole-organ clinically relevant perturbations, which most often appear after a temporal gap that may last months or even years (Fig. 1). The reason for this two-stage course remains elusive, and several, likely not mutually exclusive factors, such as senescence  or stalled autophagy , have been suggested.
Abnormal energy metabolism with depressed mitochondrial oxidation and enhanced lactate-producing glycolysis characterizes both the early and the late phases of anthracycline cardiotoxicity [13, 14, 23] (Fig. 1). Within this metabolic reorganization, hexokinase displays increased activity [13, 14, 25, 26]. Since this enzyme is also thought to be responsible for the phosphorylation of 18FDG leading to intracellular tracer retention , it is conceivable that the augmented myocardial uptake of 18FDG following DOX chemotherapy is the consequence of heightened hexokinase activity. If so, this and other recent studies [16, 17, 19, 28] may be viewed as indirect confirmation that anthracycline-initiated impairment of energy metabolism occurs in the human heart as it does in experimental models.
There may be other explanations for cardiac 18FDG accumulation upon exposure to DOX. Intracellular mediators other than hexokinase may mediate at least part of 18FDG uptake in cardiomyocytes, as it has recently been proposed for cancer cells . Furthermore, the possible contribution of an increase in the expression of transmembrane glucose (and 18FDG) transporters , as well as of non-cardiomyocytes, must be taken into consideration.
Regardless of how the heart becomes more avid of 18FDG after anthracycline chemotherapy, this phenomenon might be exploited for cardiotoxicity surveillance.
Nowadays, LVEF monitoring by repeated echocardiography is the standard of care to detect anthracycline cardiotoxicity, but it captures only the late steps of anthracycline-elicited cardiomyopathy, when global LV systolic dysfunction develops. The ideal marker should allow the recognition of anthracycline damage much earlier, when cardiac homeostasis is profoundly disrupted but the whole heart appears normal. Both troponin, a biomarker of cardiomyocyte injury , and echocardiography with LV global longitudinal strain analysis, which identifies an impairment in myocardial deformation that occurs when LVEF is still preserved, have been proposed for the scope [8, 9, 11]. Nevertheless, implementation of these screening approaches in clinical practice is difficult, one main reason being that they represent further procedures added to the already high number of diagnostic tests the oncological patient undergoes, with not negligible personal and health care costs.
By contrast, 18FDG-PET offers the unique advantage that it is routinely performed for HL [1, 2, 32] and does not require additional radiation or exam prolongation. In our cohort, higher myocardial 18FDG uptake was associated with a small but significant drop of LVEF values to the very low part of the range of normality, suggesting that systematic analysis of radiotracer retention by the heart during 18FDG-PET done for oncological purposes may be another way to detect anthracycline cardiotoxicity. Additional work is needed to confirm this opportunistic use of 18FDG-PET and whether cardiac 18FDG accumulation may anticipate LVEF decline, since we did not evaluate echocardiograms performed at the same time of PET scans. Similarly, it has to be investigated whether and how 18FDG-PET can be integrated with other imaging techniques and/or circulating biomarkers.
Only a few of our patients had LVEF below the upper normal limit and there were no cases of heart failure at follow-up. Nonetheless, the study population was made of young individuals with low cardiovascular risk, for whom minor decreases in LVEF are not expected and must be deemed biologically relevant, even though clinically silent. This is even more so considering that such patients are generally believed not to be prone to cardiovascular events and therefore are not monitored in this regard. Moreover, it was shown that subjects treated with anthracyclines who initially face a small reduction in LVEF are at greatest risk of developing heart failure over time .
There are some limitations of this work to be acknowledged. Because of the retrospective design, LVEF was calculated from reported LV diameters. However, in the presence of normal LV size and regional kinesis like for the cases we reviewed, the Teicholz formula is reliable to estimate LVEF . Second, the 18FDG-PET scans we analyzed were obtained without any dietary preparation of the patients, as it is routinely done in oncological practice. Even though we corrected for SM activity, it cannot be excluded that at least part of the variations in myocardial tracer uptake were due to different dietary regimens followed by the studied subjects. Prospective investigations are needed to overcome this shortcoming, by including a high-fat low-carbohydrate diet or pharmacological preparation to minimize diet-dependent LV-SUV variability. Finally, the method used to evaluate myocardial metabolism in non-dedicated 18FDG-PET is not yet standardized and the LV-SUV thresholds according to which patients were categorized were arbitrary. Future studies should define the optimal technical aspects and reduce inter-reader and inter-scanner variability .
We propose 18FDG-PET as a tool to better characterize and monitor anthracycline toxicity on the human heart, with potential clinical implications. Further research is warranted to support this claim and expand the evidence from low-risk subjects like the ones we studied to a population that ultimately develop heart failure. From the basic science standpoint, our results reiterate the emphasis on the metabolic aspects of anthracycline cardiotoxicity.
positron emission tomography
left ventricular standardized uptake value
- PETSTAGING :
PET before treatment
- PETINTERIM :
PET after 2 cycles
- PETEOT :
PET at the end of treatment
- ECHOPRE :
- ECHOPOST :
LV end-diastolic diameter
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MS, EA, SC, SM, MM and AGC reviewed the medical records, selected the eligible patients and created the study dataset. MB and CM analyzed the 18FDG-PET data. GG and MB analyzed the echocardiography data. MS, GS, CB, PA and PS wrote the manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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All patients admitted to the hospital where the study was carried out sign a written informed consent for use of their data for research purposes, as approved by the institutional Ethics Committee.
This study was funded by the program “Ricerca Corrente,” line “Guest-Cancer Interactions,” by Compagnia di San Paolo (Project ID Prot.: 2015.AAI4110.U4917).
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Sarocchi, M., Bauckneht, M., Arboscello, E. et al. An increase in myocardial 18-fluorodeoxyglucose uptake is associated with left ventricular ejection fraction decline in Hodgkin lymphoma patients treated with anthracycline. J Transl Med 16, 295 (2018). https://doi.org/10.1186/s12967-018-1670-9
- Left ventricular dysfunction
- Heart failure