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Spectrum of Cerebrovascular Disease in Patients with Multiple Myeloma Undergoing Chemotherapy—Results of a Case Control Study

  • Archana Hinduja ,

    archanahinduja@yahoo.com

    Affiliations Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, United States of America, Department of Neurology, Ohio State University Wexner Medical Center, Columbus, OH, United States of America

  • Kaustubh Limaye,

    Affiliation Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR, United States of America

  • Rahul Ravilla,

    Affiliation Department of Hematology and Oncology, University of Arkansas for Medical Sciences, Little Rock, AR, United States of America

  • Appalnaidu Sasapu,

    Affiliation Department of Hematology and Oncology, University of Arkansas for Medical Sciences, Little Rock, AR, United States of America

  • Xenofon Papanikolaou,

    Affiliation Multiple Myeloma for Research and Therapy, University of Arkansas for Medical Sciences, Little Rock, AR, United States of America

  • Lai Wei,

    Affiliation Department of Neurology, Ohio State University Wexner Medical Center, Columbus, OH, United States of America

  • Michel Torbey,

    Affiliations Department of Neurology, Ohio State University Wexner Medical Center, Columbus, OH, United States of America, Department of Neurosurgery, Ohio State University Wexner Medical Center, Columbus, OH, United States of America

  • Sarah Waheed

    Affiliation Multiple Myeloma for Research and Therapy, University of Arkansas for Medical Sciences, Little Rock, AR, United States of America

Spectrum of Cerebrovascular Disease in Patients with Multiple Myeloma Undergoing Chemotherapy—Results of a Case Control Study

  • Archana Hinduja, 
  • Kaustubh Limaye, 
  • Rahul Ravilla, 
  • Appalnaidu Sasapu, 
  • Xenofon Papanikolaou, 
  • Lai Wei, 
  • Michel Torbey, 
  • Sarah Waheed
PLOS
x

Correction

30 Mar 2017: Hinduja A, Limaye K, Ravilla R, Sasapu A, Papanikolaou X, et al. (2017) Correction: Spectrum of Cerebrovascular Disease in Patients with Multiple Myeloma Undergoing Chemotherapy—Results of a Case Control Study. PLOS ONE 12(3): e0175218. https://doi.org/10.1371/journal.pone.0175218 View correction

Abstract

Objectives

Patients with multiple myeloma (MM) are at increased risk of arterial thrombosis. Our aim was to determine the risk factors, mechanisms and outcome of strokes in these patients.

Methods

We conducted a retrospective matched case–control study from our database of MM patients enrolled in Total Therapy (TT) 2, TT3a and TT3b protocols who developed a vascular event (transient ischemic attack, ischemic stroke, or intracerebral hemorrhage) from October 1998 to January 2014. Cases were matched for age-matched selected controls. Baseline demographics, risk factors, MM characteristics, laboratory values, and mortality of cases were compared to those of controls. Multivariate logistic regression analysis identified risk factors associated with stroke. Ischemic strokes (IS) were classified with modified Trial of Org 10172 in Acute Stroke Treatment (TOAST) criteria.

Results

Of 1,148 patients, 46 developed a vascular event (ischemic stroke, 33; transient ischemic attack, 11; hypertensive intracerebral hemorrhage, 2). Multivariate logistic regression analysis determined renal insufficiency (odds Ratio, 3.528; 95% CI, 1.36–9.14; P = 0.0094) and MM Stages I and II (odds Ratio, 2.770, 95% CI, 1.31–5.81; p = 0.0073) were independent predictors of stroke. In our study, strokes attributable to hypercoagulability, atrial fibrillation and small-vessel occlusion were common mechanisms. After a stroke, 78% of patients were discharged to home or a rehabilitation facility and 4% to a long-term nursing facility; in-hospital mortality was 15%. Despite suffering a stroke no significant differences in survival were observed.

Conclusion

In our cohort of multiple myeloma patients, renal failure and MM Stages I and II had increased risk of stroke.

Background

Multiple myeloma (MM) is the second most common hematological malignancy among adults in the United States [1], and patients with MM have an increased risk of venous thromboembolism (VTE) [2]. Although the use of combination chemotherapy has markedly improved clinical outcomes for patients with multiple myeloma [3], these agents have been associated with an increased risk of venous thromboembolism, especially during the first months of chemotherapy. Factors that contribute to thrombosis include those associated with the patient, cancer and treatment [46]. Interestingly, increased rates of arterial thrombosis (coronary artery disease, cerebrovascular disease, myocardial infarction) have been reported, and the highest incidence occurs during induction of chemotherapy [7].

In a large population-based study (18,627 MM patients, 70,991 matched controls) the hazard ratios of VTE at 1, 5, and 10 years were 7.5, 4.6, and 4.1, and the risk of cerebrovascular disease was 1.5, 1.2, and 1.2 respectively [8]. Currently, there is limited data on the risk factors, mechanisms and outcomes of strokes among patients with MM. Knowledge of such predictors will help us adopt preventive strategies to reduce the incidence of stroke and improve outcomes in the near future. The primary aim of our study was to identify the stroke types, mechanisms, risk factors, and outcomes at discharge after an acute stroke among MM patients undergoing three similar chemotherapy regimens. In addition, we assessed the rates of recurrent strokes and survival time after the index event.

Materials and Methods

Study Population and Data Collection

Our study was retrospective review of our database of MM patients enrolled in Total Therapy (TT) 2, TT3a, and TT3b protocols and managed at our academic tertiary care medical center from October 1998 to January 2014; the institutional review board of University of Arkansas for Medical Sciences approved the study. Details of the protocols and patient outcomes were previously reported [912]. All patients signed an informed consent according to University of Arkansas for Medical Sciences and federal guidelines. All protocols were approved by our institutional review board of University of Arkansas for Medical Sciences and monitored by a data safety and monitoring board of University of Arkansas for Medical Sciences and outcome data were audited by an independent team of reviewers. Magnetic resonance imaging studies were performed in all patients who had symptoms and signs suggestive of a stroke. All patients who sustained an ischemic stroke (IS), transient ischemic attack (TIA) or intracerebral hemorrhage (ICH) from the time of enrollment until their last follow-up course were included.

Briefly, TT2 consisted of two arms of newly diagnosed MM patients who were ≤ 75 years old. At enrollment, patients were randomly assigned either to a control group (no thalidomide) or experimental group (thalidomide). Both arms consisted of multi-agent induction chemotherapy along with tandem autologous transplants, with the only difference in the inclusion or exclusion of thalidomide. Thalidomide doses were 400 mg daily during induction chemotherapy, 100 mg daily between transplantations, 200 mg daily with consolidation therapy, 100 mg daily during the first year of maintenance therapy, and then 50 mg on alternating days thereafter; the drug was given until relapse or adverse events occurred. Low-molecular-weight heparin was given prophylactically to all patients in the thalidomide group starting in July 2001.

Total Therapy 3 protocols were characterized by incorporation of bortezomib in addition multi-agent chemotherapy that consisted of thalidomide at induction and maintenance phases. TT3a and TT3b differed only in the maintenance phase; TT3a applied bortezomib, thalidomide and dexamethasone only in the first year and only thalidomide and dexamethasone thereafter, but TT3b applied bortezomib, lenalidomide and dexamethasone for all 3 years. Thus only the maintenance phase of TT3a and TT3b deferred with TT3a having thalidomide and TT3b with lenalidomide. Thalidomide dosage did not exceed 200 mg in any phase of the protocols, and titration of dosage to a minimum of 50 mg was permitted to ensure maximum compliance to the treatment. For lenalidomide, the maximum and minimum permitted dosages at the time were 15 mg and 5 mg, respectively. No routine prophylaxis for deep vein thrombosis was administered in the TT3 protocols. Of note, renal insufficiency was not an exclusion criterion for TT2 as long as it was of recent onset and due to Bence-Jones proteinuria or hypercalcemia, but patients were not eligible for TT3 protocols if creatinine levels were >3 mg/dl, regardless of the reason. We specifically selected patients enrolled in TT2 and TT3 protocols because wanted to study the effects of thalidomide and lenalinomide exclusively. This cut of makes it feasible to include patients with mild to moderate renal failure. Thus varying degrees of renal insufficiency was prevalent in all treatment protocols.

All cases (i.e., MM patients who had strokes) were compared with age-matched controls (i.e., MM patients who did not have strokes). Baseline demographics (age, gender, race), risk factors (hypertension, hyperlipidemia, diabetes mellitus, coronary artery disease, congestive heart failure, atrial fibrillation, obstructive sleep apnea, smoking, alcohol use, other malignancies, renal insufficiency, need for hemodialysis, prior VTE), MM characteristics (protocol, stage, isotype, risk category), laboratory values (complete blood count, coagulation profile, fasting blood glucose, β2 microglobulin, blood urea nitrogen, creatinine, albumin), and mortality were compared between both groups. Additionally, among the cohort of stroke cases, baseline laboratory values at the initial visit were compared with those during the vascular insult.

Clinical Definitions

Transient ischemic attack was defined as rapidly developing symptoms and signs of loss of cerebral function of vascular origin with a negative diffusion-weighted imaging (DWI) sequence on magnetic resonance imaging (MRI) [13] and ischemic stroke was defined as a positive DWI sequence of MRI. The stroke subtype was classified based on the TOAST (Trial of Org 10172 in Acute Stroke Treatment) criteria by two neurologists independently, and in case of disagreement settled by a third neurologist [14]. Conclusions of the stroke subtype were drawn based on the laboratory data, imaging studies, cardiac studies (transthoracic and transesophageal echocardiographic, telemetry monitoring data in the medical records). Intracerebral hemorrhage (ICH) was defined as extravasation of blood within the brain parenchyma; intracerebral hemorrhage secondary to arteriovenous malformation, trauma, tumor, or cerebral venous sinus thrombosis was excluded. Hypertension was defined as systolic blood pressure >140 mm Hg, diastolic blood pressure >90 mm Hg, or taking an antihypertensive agent. Diabetes mellitus was defined as fasting blood glucose ≥ 125 mg/dl or taking an oral hypoglycemic medication. Hyperlipidemia was defined as low-density lipoprotein >160 mg/dl, total cholesterol > 240 mg/dl, or taking lipid-lowering medication. Smoking was defined as current smokers or smokers who quit within the previous 12 months. Alcohol abuse was defined as daily drinking >2 drinks for >1 year. Renal insufficiency was defined as an increase in serum creatinine, decline in glomerular filtration rate, or decreased urine output; dose adjustments to chemotherapeutic agents were made based on creatinine levels.

Clinical Outcomes

The disposition at discharge and recurrence of vascular event upon follow up were assessed in the cohort of stroke cases (i.e., MM patients who had strokes). In addition, all-cause mortality and survival upon follow up was compared between both groups.

Statistical Analysis

Baseline characteristics, risk factors, laboratory parameters, and outcomes of the two groups were compared with Pearson’s Chi-square test or Fisher’s exact test for categorical variables and student t-test for continuous variables. All parameters determined by univariate analysis to be significant (P<0.05) were included in a multivariate regression analysis to identify the risk factors associated with stroke in MM patients. Among the cohort of stroke cases, comparison of the laboratory values between initial visit and during the vascular insult was performed using the paired t-tests. Overall survival was calculated from the start of the protocol to death from any cause. Patients who were still alive in April 2015 were censored at the date of last contact. Survival curves (estimated using the method of Kaplan-Meier) of cases and controls were compared with the log-rank test; estimated median with 95% confidence intervals were reported. Survival curves were used to estimate mortality rates for both groups and were estimated at 2, 3, 4, and 5 years. For all statistical analyses, SAS 9.4 software was used, and, P ≤0.05 was considered statistically significant.

Results

During this study period, 1,148 patients with MM were enrolled; TT2 without thalidomide (TT2−Thal; n = 345), TT2 with thalidomide (TT2+Thal; n = 323), TT3a (n = 303), and TT3b (n = 177); 4% (46 patients) of patients developed an acute stroke after enrollment with a median time of 21.5 months (0–150 months, Fig 1).

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Fig 1. Kaplan-Meier curve representing the time from enrollment to stroke only in the cohort of MM stroke cases.

https://doi.org/10.1371/journal.pone.0166627.g001

IS was the most common type of stroke (72%; 33 patients) followed by transient ischemic attack (24%; 11 patients), and hypertensive basal ganglia hemorrhage (4%; 2 patients). All patients diagnosed as TIA in our cohort had a negative DWI on MRI. The most common mechanisms of stroke in our cohort of MM patients was thrombotic in nature from hypercoaguable state (15%; 7 patients), followed by cardioembolism (13%; 6 patients), small vessel disease (13%; 6 patients), multiple other known mechanisms (watershed patterns of strokes from hypotension, sepsis) (15%; 7 patients), large-vessel disease (7%; 3 patients), and cryptogenic in (9%; 4 patients). Inter current systemic infections were observed in 28% (13 patients) of stroke patients but none of them had evidence of nonbacterial thrombotic endocarditis. Vascular events of ischemic etiology occurred despite prior use of antiplatelet and anticoagulation therapy (two patients in each group). After a vascular event, antiplatelet agents were administered to 16 patients and anticoagulants to 7 patients; however 23 patients were ineligible for both antiplatelet and anticoagulant agents due to thrombocytopenia.

Demographics, risk factors, and baseline laboratory values are described in Tables 1 and 2. Univariate analysis indicated that patients who developed strokes were more likely than controls to have a positive smoking history (26.1% vs 13%, P = 0.0381), have renal insufficiency (23.9% vs 8.0%, P = 0.0039), require hemodialysis (10.9 vs 0.7%, P = 0.004) and have Stage I or II myeloma as opposed to Stage III (Stage I: 23.9% vs 9.4%; Stage II: 17.4% vs 12.3; Stage III: 58.7% vs 78.3%; P = 0.025). These factors remained significantly positive when hemorrhagic strokes were excluded from analysis. Since only one patient had a prior stroke, this risk factor was excluded from analysis. Multivariate logistic regression analysis (Table 3) indicated that independent predictors associated with stroke were renal insufficiency (odds ratio, 3.528; 95% CI, 1.36–9.14; P = 0.0094) and Stage I and II myeloma (odds ratio, 2.770; 95% CI, 1.31–5.81; P = 0.0073); significance of smoking was borderline (odds ratio, 2.324; 95% CI, 0.98–5.54; P = 0.0572). Hemodialysis was excluded from this analysis because only one patient in the control group required hemodialysis.

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Table 1. Characteristics of Multiple Myeloma Patients With and Without Stroke.

https://doi.org/10.1371/journal.pone.0166627.t001

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Table 2. Baseline Laboratory Values of MM Patients With and Without Stroke.

https://doi.org/10.1371/journal.pone.0166627.t002

In our cohort of 46 cases, 78% (36 patients) were discharged home or to a rehabilitation facility and 4% (2 patients) to a long-term nursing facility. In-hospital mortality was 15% (7 patients), with stroke-related mortality in 13% (6 patients). The two groups did not differ significantly in median overall survival (121 vs 137 months, P = 0.34) or mortality rate at 2 years (15.2% vs 16.1%, P = 0.89), 3 years (19.6% vs 21.9%, P = 0.73), 4 years (19.6% vs 27.0%, P = 0.29) and 5 years (23.9% vs 29.2%, P = 0.47) (Fig 2). During a median follow up of 10 years, the cumulative risk of recurrent stroke was 15% (6/39 patients). Among the stroke cases, there was no significant relationship between mortality and use of thalidomide; median survival was 103 months for a thalidomide-based regimen (95% CI 42,135) and 78 months (95% CI 10,115)(P = 0.1808) for a regimen without thalidomide.

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Fig 2. Overall survival (OS) was calculated from the start of the protocol to death from any cause.

Patients who were still alive were censored at the date of last contact. Survival curves were estimated using the method of Kaplan-Meier.

https://doi.org/10.1371/journal.pone.0166627.g002

Although baseline laboratory values (Table 4) did not significantly differ between the groups, the cohort of stroke cases had a significant decrease in platelet count (112.6±78.6 vs 255.2±104.2, P<0.0001) and increase in International Normalized Ratio (1.25±0.33 vs 1.08±0.12, P = 0.0096) during the vascular insult, as compared to baseline values.

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Table 4. Laboratory Values at Baseline and During Vascular Event for MM Patients Who Experienced Stroke.

https://doi.org/10.1371/journal.pone.0166627.t004

Discussion

This large single-center retrospective, comparative case−control study of MM patients enrolled in TT2, TT3a, and TT3b protocols over 10 years, identified 4% of patients who developed an acute stroke. Only 4% of the strokes were of the hemorrhagic type, which is different from the general population (10%) and patients with cancer (14–18%) [1517]. Although prior studies demonstrated increased risk of arterial thrombosis from activated prothrombotic factors, especially during the induction phase of anti-MM therapy [7, 18], vascular events occurred even months after the induction phase in our cohort. The major mechanisms of strokes in our cohort were from underlying hypercoagulable state or chemotherapeutic agents, cardioembolic causes and small-vessel occlusion. These are a bit different compared to the general population where strokes from large vessel disease, small vessel disease and cardioembolic are predominant mechanisms, and amongst patients with cancer, besides these, cryptogenic and embolic phenomenons are common mechanisms [1923]. Although in-hospital mortality was higher in our cohort compared to the national surveillance standards, which is 5% [24], underlying malignancy is a well-known predictor of mortality [9, 25]. Despite these odds, the percentage of patients discharged home, to acute rehabilitation facilities and to long-term nursing facilities after a stroke was similar to the national average [24]. The annual risk of recurrent strokes in the general population is about 5% [15, 26]. Underlying malignancy is a predictor of recurrent strokes with a yearly recurrence rate of 15% [21, 27]. Although the recurrence rate of stroke amongst patients with multiple myeloma is not known, the cumulative risk of recurrence in our cohort over a decade of follow up was only 15%.

The major risk factors associated with stroke in our study were renal insufficiency and Stage I or II MM, with a trend for smoking, which is a novel finding when compared to prior results, indicating that hypertension and smoking were significant risk factors [7]. Approximately 20−40% of newly diagnosed MM patients have renal impairment, explaining the large contribution of this mechanism in our cohort [28, 29]. Although no significant differences in their baseline renal functions were observed, renal insufficiency was a significant predictor of stroke thus reflective that these developed during the disease course. Large population- based studies have shown increased risk of stroke, asymptomatic cerebral lacunae, and recurrent strokes from renal dysfunction, thereby explaining the heightened risk of stroke among MM patients [3032]. Patients with kidney disease are at increased risk of cardiogenic and atherosclerotic strokes, which may partly explain the noncancer-related mechanism in our cohort [33]. Increased mortality and worse outcomes have been observed in stroke patients with concurrent kidney disease, and this may partly have contributed to the high in-hospital morality observed in our study [34, 35]. Although kidney disease and stroke share common risk factors, including hypertension, hyperlipidemia, diabetes mellitus, smoking, obesity, and aging, these factors were not significant predictors in our cohort. Patients with kidney disease have (a) non traditional risk factors (increased inflammation from oxidative stress, asymmetric dimethylarginine that inhibits nitric oxide, hyperhomocysteinaemia, sympathetic over activity triggering vascular injury and endothelial dysfunction) and (b) uremia risk factors (uremic toxins, sodium and water retention, anemia and malnutrition, abnormal calcium and phosphorous metabolism, hyperparathyroidism and decreased Klotho protein expression) that contribute to increased cardiovascular risk [3641]. Additionally the kidney and the brain share similar susceptibilities to hemodynamic derangements [42]. Also noteworthy, patients with MM who developed renal insufficiency had worse clinical outcomes despite improvement in their renal function or lack of significant difference in their baseline renal functions between various treatment protocols [43]. Thus increased risk of stroke, recurrent stroke, and mortality in our cohort could partly be due to renal disease, which may or might not have resulted from myeloma. Although systemic infections were identified in a third during the vascular event and systemic infection is a well-identified triggering mechanism of stroke [44], we did not analyze the association with stroke because of the retrospective nature of our study.

Increased risk of stroke was observed in patients with Stage I and II MM, but no such relationship was observed for various treatment protocols or thalidomide use. However, the relationship with thalidomide may be underpowered given the case-control nature of our study. No study has yet evaluated the risk of VTE and arterial thrombosis for patients with Stage 1 or II MM; differences have only been noted only for patients with newly diagnosed MM versus those with relapsed MM [45, 46]. Thalidomide alone does not increase the risk of VTE, and incidence of VTE was 3−5% for patients with newly diagnosed MM [3, 47]. The combination of thalidomide with dexamethasone significantly increased the incidence of VTE to 14–28% in newly diagnosed MM patients [5, 45, 48] and thalidomide in combination with multiagent chemotherapy increases VTE risk to 16−34% in newly diagnosed patients[9, 49]. Similarly, lenalinomide did not increase the VTE risk as a single agent, but in combination with dexamethasone, risk increased to 8−75% in newly diagnosed MM patients [3, 50], and the increased risk of VTE was highest in the first year after diagnosis. MM patients have an increased risk also of arterial thromboembolic events and thrombosis is associated with inferior survival for these patients [51]. Although in-hospital mortality was high, it was not statistically significant, and overall survival was not significantly different in our analysis of matched cases and controls. These results are discordant with those of large population-based studies probably because we had a smaller sample size [51]. In our study, patients developed strokes at different time frames from enrollment into various protocols, which also accounted for mortality at various time frames. Recent literature has clearly demonstrated that low body weight, thrombocytopenia and renal failure are strong risk factors associated with early mortality from infections and various comorbidities [52]. Other variables that have been associated with mortality among myeloma patients include age, worsening stage and type of therapy [53, 54]. The mechanism of early mortality in both groups was from their inherit risk through various processes, with stroke being the culprit in the cases and other causes in the controls, thereby explaining the similarities in early survival in both groups.

Management of strokes in patients with MM depends upon the etiology. Common mechanisms of stroke in patients with underlying malignancy include hypercoagulability and cardioembolism, among other mechanisms [17, 18, 23]. Interestingly, our patients developed strokes despite a trend towards coagulopathy, to the extent that 50% were ineligible for immediate use of antiplatelet agents. In our study, besides strokes attributed to coagulopathy, other mechanisms such as atrial fibrillation and small-vessel occlusion played major contributing mechanisms. These results have heightened our awareness that the incidence of stroke in patients with renal insufficiency may be decreased with some aggressive preventive measures, including management of hypertension, diabetes mellitus, hyperlipidemia; avoidance of hypotension; and use of novel chemotherapeutic agents.

Some major drawbacks of our study include a retrospective review, referral bias rather than true population patterns, inclusion of a subset of MM patients enrolled in specific treatment protocols, aggressiveness of the myeloma during the index event, a small sample size, and a case−control analysis. Because of a small sample size, the results of our study may need to be interpreted with caution until these are validated by large studies. Although the stroke subtype was arrived based on the TOAST criteria, the lack of long-term cardiac monitoring evaluation may have possibly underestimated the percentage of cardioembolic strokes. Besides, certain patients had multiple factors in which case the imaging pattern and triggering factor were the deciding factors. Although nephropathy preceded the occurrence of stroke, the exact time frame and the degree of renal failure was unavailable because definitions varied over the entire decade. Finally, the etiology of renal disease may either be due to myeloma or non-myeloma related origin and could not be evaluated because of the retrospective nature of our analysis.

To conclude, in our cohort of multiple myeloma patients, renal failure, MM Stage I and II were significant risk factors associated with stroke, which is different when compared to the general population. Despite a high rate of in-hospital mortality, patients with MM who develop a vascular event have good outcomes at discharge and overall long-term survival. Besides myeloma- related thrombosis, cardioembolic causes and small-vessel occlusions were other possible stroke mechanisms. Unlike other malignancies, patients with MM had greater risk of stroke if they had renal disease; thus renal disease may serve as a marker to identify high-risk patients, but will need confirmation in large population-based studies. Adoption of various preventive measures, especially for patients with renal insufficiency, may reduce the risk of stroke in future.

Supporting Information

S1 Table. Characteristics of Multiple myeloma patients with Ischemic stroke and controls.

https://doi.org/10.1371/journal.pone.0166627.s001

(DOCX)

S2 Table. Comparison of baseline laboratory values between MM patients experiencing a ischemic stroke with control.

https://doi.org/10.1371/journal.pone.0166627.s002

(DOCX)

Acknowledgments

The manuscript was edited by Peggy Brenner, PhD, ELS, in the Grants and Scientific Publications at the University of Arkansas for Medical Sciences.

Author Contributions

  1. Conceptualization: AH SW.
  2. Data curation: AH KL RR AS.
  3. Formal analysis: AH SW XP KL LW.
  4. Funding acquisition: AH.
  5. Investigation: AH SW KL RR AS.
  6. Methodology: AH SW XP KL.
  7. Project administration: AH KL RR AS SW XP LW MT.
  8. Resources: AH SW LW MT.
  9. Software: LW.
  10. Supervision: AH KL SW XP MT LW.
  11. Validation: LW AH SW MT.
  12. Visualization: AH LW.
  13. Writing – original draft: AH SW XP LW.
  14. Writing – review & editing: AH SW XP RR AS KL LW MT.

References

  1. 1. Siegel R, Ma J, Zou Z, Jemal A. Cancer statistics, 2014. CA Cancer J Clin. 2014; 64: 9–29. pmid:24399786
  2. 2. Catovsky D, Ikoku NB, Pitney WR, Galton DA. Thromboembolic complications in myelomatosis. BMJ. 1970; 3: 438–439. pmid:5454323
  3. 3. Dimopoulos M, Spencer A, Attal M, Prince HM, Harousseau JL, Dmoszynska A, et al. Lenalidomide plus dexamethasone for relapsed or refractory multiple myeloma. N Engl J Med. 2007; 357: 2123–2132. pmid:18032762
  4. 4. Bennett CL, Angelotta C, Yarnold PR, Evens AM, Zonder JA, Raisch DW, Richardson P. Thalidomide- and lenalidomide-associated thromboembolism among patients with cancer. JAMA. 2006; 296: 2558–2560.
  5. 5. Zangari M, Anaissie E, Barlogie B, Badros A, Desikan R, Gopal AV, et al. Increased risk of deep-vein thrombosis in patients with multiple myeloma receiving thalidomide and chemotherapy. Blood. 2001; 98: 1614–1615. pmid:11520815
  6. 6. Rajkumar SV, Blood E. Lenalidomide and venous thrombosis in multiple myeloma. N Engl J Med. 2006; 354: 2079–2080.
  7. 7. Libourel EJ, Sonneveld P, van der Holt B, de Maat MP, Leebeek FW. High incidence of arterial thrombosis in young patients treated for multiple myeloma: results of a prospective cohort study. Blood. 2010; 116: 22–26. pmid:20339094
  8. 8. Kristinsson SY, Pfeiffer RM, Bjorkholm M, Goldin LR, Schulman S, Blimark C, et al. Arterial and venous thrombosis in monoclonal gammopathy of undetermined significance and multiple myeloma: a population-based study. Blood. 2010; 115: 4991–4998. pmid:20299513
  9. 9. Barlogie B, Tricot G, Anaissie E, Shaughnessy J, Rasmussen E, van Rhee F, et al. Thalidomide and hematopoietic-cell transplantation for multiple myeloma. N Engl J Med. 2006; 354: 1021–1030. pmid:16525139
  10. 10. van Rhee F, Szymonifka J, Anaissie E, Nair B, Waheed S, Alsayed Y, et al. Total Therapy 3 for multiple myeloma: prognostic implications of cumulative dosing and premature discontinuation of VTD maintenance components, bortezomib, thalidomide, and dexamethasone, relevant to all phases of therapy. Blood. 2010; 116: 1220–1227. pmid:20501894
  11. 11. Nair B, van Rhee F, Shaughnessy JD Jr., Anaissie E, Szymonifka J, Hoering A, et al. Superior results of Total Therapy 3 (2003–33) in gene expression profiling-defined low-risk multiple myeloma confirmed in subsequent trial 2006–66 with VRD maintenance. Blood. 2010; 115: 4168–4173. pmid:20124509
  12. 12. Barlogie B, Mitchell A, van Rhee F, Epstein J, Morgan GJ, Crowley J. Curing myeloma at last: defining criteria and providing the evidence. Blood. 2014; 124: 3043–3051. pmid:25293776
  13. 13. Easton JD, Saver JL, Albers GW, Alberts MJ, Chaturvedi S, Feldmann E, et al. Definition and evaluation of transient ischemic attack: a scientific statement for healthcare professionals from the American Heart Association/American Stroke Association Stroke Council; Council on Cardiovascular Surgery and Anesthesia; Council on Cardiovascular Radiology and Intervention; Council on Cardiovascular Nursing; and the Interdisciplinary Council on Peripheral Vascular Disease. The American Academy of Neurology affirms the value of this statement as an educational tool for neurologists. Stroke. 2009; 40: 2276–2293. pmid:19423857
  14. 14. Adams HP Jr., Bendixen BH, Kappelle LJ, Biller J, Love BB, Gordon DL, et al. Classification of subtype of acute ischemic stroke. Definitions for use in a multicenter clinical trial. TOAST. Trial of Org 10172 in Acute Stroke Treatment. Stroke. 1993; 24: 35–41. pmid:7678184
  15. 15. Mozaffarian D, Benjamin EJ, Go AS, Arnett DK, Blaha MJ, Cushman M, et al. Heart disease and stroke statistics—2015 update: a report from the American Heart Association. Circulation. 2015; 131: e29–322. pmid:25520374
  16. 16. Zhang YY, Chan DK, Cordato D, Shen Q, Sheng AZ. Stroke risk factor, pattern and outcome in patients with cancer. Acta Neurol Scand 2006; 114: 378–383. pmid:17083337
  17. 17. Stefan O, Vera N, Otto B, Heinz L, Wolfgang G. Stroke in cancer patients: a risk factor analysis. J Neurooncol. 2009; 94: 221–226. pmid:19280119
  18. 18. Schwarzbach CJ, Schaefer A, Ebert A, Held V, Bolognese M, Kablau M, et al. Stroke and cancer: the importance of cancer-associated hypercoagulation as a possible stroke etiology. Stroke. 2012; 43: 3029–3034. pmid:22996958
  19. 19. Bejot Y, Caillier M, Ben Salem D, Couvreur G, Rouaud O, Osseby GV, et al. Ischaemic stroke subtypes and associated risk factors: a French population based study. J Neurol Neurosurg Psychiatr.y 2008; 79: 1344–1348.
  20. 20. Hajat C, Heuschmann PU, Coshall C, Padayachee S, Chambers J, Rudd AG, et al. Incidence of aetiological subtypes of stroke in a multi-ethnic population based study: the South London Stroke Register. J Neurol Neurosurg Psychiatry. 2011; 82: 527–533. pmid:20974649
  21. 21. Navi BB, Singer S, Merkler AE, Cheng NT, Stone JB, Kamel H, et al. Recurrent thromboembolic events after ischemic stroke in patients with cancer. Neurology. 2014; 83: 26–33. pmid:24850486
  22. 22. Aarnio K, Joensuu H, Haapaniemi E, Melkas S, Kaste M, Tatlisumak T, et al. Cancer in young adults with ischemic stroke. Stroke. 2015; 46: 1601–1606. pmid:25922510
  23. 23. Cestari DM, Weine DM, Panageas KS, Segal AZ, DeAngelis LM. Stroke in patients with cancer: incidence and etiology. Neurology. 2004; 62: 2025–2030. pmid:15184609
  24. 24. Fonarow GC, Reeves MJ, Smith EE, Saver JL, Zhao X, Olson DW, et al. Characteristics, performance measures, and in-hospital outcomes of the first one million stroke and transient ischemic attack admissions in get with the guidelines-stroke. Circ Cardiovasc Qual Outcomes. 2010; 3: 291–302. pmid:20177051
  25. 25. Putaala J, Curtze S, Hiltunen S, Tolppanen H, Kaste M, Tatlisumak T. Causes of death and predictors of 5-year mortality in young adults after first-ever ischemic stroke: the Helsinki Young Stroke Registry. Stroke. 2009; 40: 2698–2703. pmid:19590052
  26. 26. Hong KS, Yegiaian S, Lee M, Lee J, Saver JL. Declining stroke and vascular event recurrence rates in secondary prevention trials over the past 50 years and consequences for current trial design. Circulation. 2011; 123: 2111–2119. pmid:21536995
  27. 27. Lau KK, Wong YK, Teo KC, Chang RS, Hon SF, Chan KH, et al. Stroke patients with a past history of cancer are at increased risk of recurrent stroke and cardiovascular mortality. PLoS One. 2014; 9: e88283. pmid:24523883
  28. 28. Kyle RA, Gertz MA, Witzig TE, Lust JA, Lacy MQ, Dispenzieri A, et al. Review of 1027 patients with newly diagnosed multiple myeloma. Mayo Clinic. 2003; 78: 21–33.
  29. 29. Knudsen LM, Hippe E, Hjorth M, Holmberg E, Westin J. Renal function in newly diagnosed multiple myeloma—a demographic study of 1353 patients. The Nordic Myeloma Study Group. Eur J Haematol. 1994; 53: 207–212. pmid:7957804
  30. 30. Holzmann MJ, Aastveit A, Hammar N, Jungner I, Walldius G, Holme I. Renal dysfunction increases the risk of ischemic and hemorrhagic stroke in the general population. Ann Med 2012. 44: 607–615. pmid:21612332
  31. 31. Ikram MA, Vernooij MW, Hofman A, Niessen WJ, van der Lugt A, Breteler MM. Kidney function is related to cerebral small vessel disease. Stroke. 2008; 39: 55–61. pmid:18048865
  32. 32. Ovbiagele B, Bath PM, Cotton D, Sha N, Diener HC, Investigators PR. Low glomerular filtration rate, recurrent stroke risk, and effect of renin-angiotensin system modulation. Stroke. 2013; 44: 3223–3225. pmid:23988639
  33. 33. Tsukamoto Y, Takahashi W, Takizawa S, Kawada S, Takagi S. Chronic kidney disease in patients with ischemic stroke. J Stroke Cerebrovasc Dis. 2012; 21: 547–550. pmid:21295995
  34. 34. Khatri M, Himmelfarb J, Adams D, Becker K, Longstreth WT, Tirschwell DL. Acute kidney injury is associated with increased hospital mortality after stroke. J Stroke Cerebrovasc Dis. 2014; 23: 25–30. pmid:22818389
  35. 35. Kumai Y, Kamouchi M, Hata J, Ago T, Kitayama J, Nakane H, et al. Proteinuria and clinical outcomes after ischemic stroke. Neurology 2012; 78: 1909–1915. pmid:22592359
  36. 36. Toyoda K, Ninomiya T. Stroke and cerebrovascular diseases in patients with chronic kidney disease. Lancet Neurol. 2014; 13: 823–833. pmid:25030514
  37. 37. Schlaich MP. Sympathetic activation in chronic kidney disease: out of the shadow. Hypertension. 2011; 57: 683–685. pmid:21300664
  38. 38. Gansevoort RT, Correa-Rotter R, Hemmelgarn BR, Jafar TH, Heerspink HJ, Mann JF, et al: Chronic kidney disease and cardiovascular risk: epidemiology, mechanisms, and prevention. Lancet. 2013; 382: 339–352. pmid:23727170
  39. 39. Moe SM: Klotho. a master regulator of cardiovascular disease? Circulation. 2012; 125: 2181–2183. pmid:22492634
  40. 40. O'Rourke MF, Safar ME. Relationship between aortic stiffening and microvascular disease in brain and kidney: cause and logic of therapy. Hypertension. 2005; 46: 200–204. pmid:15911742
  41. 41. Kang DH, Kanellis J, Hugo C, Truong L, Anderson S, Kerjaschki D, et al. Role of the microvascular endothelium in progressive renal disease. J Am So of Nephrol. 2002; 13(3):806–816.
  42. 42. Mogi M, Horiuchi M. Clinical Interaction between Brain and Kidney in Small Vessel Disease. Cardiol Res Pract. 2011; 2011: 306189. pmid:21274446
  43. 43. Khan R, Apewokin S, Grazziutti M, Yaccoby S, Epstein J, van Rhee F, et al. Renal insufficiency retains adverse prognostic implications despite renal function improvement following Total Therapy for newly diagnosed multiple myeloma. Leukemia. 2015; 29: 1195–1201. pmid:25640885
  44. 44. Lee JT, Chung WT, Lin JD, Peng GS, Muo CH, Lin CC, et al. Increased risk of stroke after septicaemia: a population-based longitudinal study in Taiwan. PLoS One. 2014; 9: e89386. pmid:24586739
  45. 45. Weber D, Rankin K, Gavino M, Delasalle K, Alexanian R. Thalidomide alone or with dexamethasone for previously untreated multiple myeloma. J Clin Oncol. 2003; 21: 16–19. pmid:12506164
  46. 46. Neben K, Moehler T, Benner A, Kraemer A, Egerer G, Ho AD, et al. Dose-dependent effect of thalidomide on overall survival in relapsed multiple myeloma. Clin Cancer Res. 2002; 8: 3377–3382. pmid:12429624
  47. 47. Rajkumar SV, Blood E, Vesole D, Fonseca R, Greipp PR. Phase III clinical trial of thalidomide plus dexamethasone compared with dexamethasone alone in newly diagnosed multiple myeloma: a clinical trial coordinated by the Eastern Cooperative Oncology Group. J Clin Oncol. 2006; 24: 431–436. pmid:16365178
  48. 48. Rajkumar SV, Hayman S, Gertz MA, Dispenzieri A, Lacy MQ, Greipp PR, et al: Combination therapy with thalidomide plus dexamethasone for newly diagnosed myeloma. J Clin Oncol. 2002; 20: 4319–4323. pmid:12409330
  49. 49. Zangari M, Siegel E, Barlogie B, Anaissie E, Saghafifar F, Fassas A, et al. Thrombogenic activity of doxorubicin in myeloma patients receiving thalidomide: implications for therapy. Blood. 2002; 100: 1168–1171. pmid:12149193
  50. 50. Zonder JA, Barlogie B, Durie BG, McCoy J, Crowley J, Hussein MA. Thrombotic complications in patients with newly diagnosed multiple myeloma treated with lenalidomide and dexamethasone: benefit of aspirin prophylaxis. Blood. 2006; 108: 403; author reply 404. pmid:16790586
  51. 51. Kristinsson SY, Pfeiffer RM, Bjorkholm M, Schulman S, Landgren O. Thrombosis is associated with inferior survival in multiple myeloma. Haematologica. 2012; 97: 1603–1607. pmid:22511493
  52. 52. Jung SH, Cho MS, Kim HK, Kim SJ, Kim K, Cheong JW, et al. Risk factors associated with early mortality in patients with multiple myeloma who were treated upfront with a novel agents containing regimen. BMC Cancer 2016; 16: 613. pmid:27501959
  53. 53. Rios R, Gonzalez-Silva M, Molina E, Garcia-Fernandez JR, Clavero ME, Duran JM, et al. The impact of the type of hospital on survival of multiple myeloma patients: the MICORE study. Rev Clin Esp (Barc) 2013; 213: 330–335.
  54. 54. Fernyhough LJ, Hock BD, Taylor J, Pearson J, Ganly P. Survival of myeloma patients following the introduction of thalidomide as a second-line therapy: a retrospective study at a single New Zealand centre. Intern Med J 2013; 43: 130–137. pmid:22530659