Direct oral anticoagulants for thromboprophylaxis in ambulatory patients with cancer

Thromboembolic events associated with immune checkpoint inhibitors in cancer patients: A Bayesian network meta-analysis

BACKGROUND

Immune checkpoint inhibitors (ICIs), which offer previously unknown therapeutic advantages, have revolutionized cancer treatment. However, the risk of thromboembolic events (TEEs) associated with ICIs remains unclear. The aim of this network meta-analysis (NMA) was to evaluate the incidence of TEEs in cancer patients receiving different treatment regimens.

METHODS

We searched for randomized clinical trials (RCTs) between January 2021 and December 2023 without restricting the cancer type. The percentages of TEEs were systematically extracted. An NMA was performed comparing atezolizumab, cemiplimab, durvalumab, ipilimumab, nivolumab, pembrolizumab, conventional therapy (which consists mainly of chemotherapy, targeted therapy, placebo, and their combinations), two ICI drugs, one ICI drug combined with conventional therapy, and two ICI drugs combined with conventional therapy. Additionally, subgroup analysis was conducted based on cancer type.

RESULTS

Eighty-three RCTs involving 54,736 patients were included. Patients receiving ICIs demonstrated comparable risks of arterial thromboembolism (ATE), deep vein thrombosis (DVT), myocardial infarction (MI), and cerebrovascular accidents (CVAs). Nivolumab (OR 0.39, 95 % CI 0.19 to 0.80) and two ICI drugs (OR 0.52, 95 % CI 0.29 to 0.89) had the lowest risk of venous thromboembolism (VTE) compared to two ICI drugs with conventional therapy. The risk of pulmonary embolism (PE) was greater for ipilimumab (OR 4.09, 95 % CI 1.13 to 15.51) than for nivolumab. For melanoma in the subgroup analysis, nivolumab significantly reduced the risk of VTE (OR 0.07, 95 % CI 0.00 to 0.76) compared to two ICI drugs. Among the single-ICI regimens, durvalumab was associated with the highest incidence of ATE, MI, and CVAs; ipilimumab had the highest incidence of VTE and PE; and pembrolizumab had the highest incidence of DVT. The combination of one ICI drug with conventional therapy was associated with a significantly greater risk of TEEs (except for MI) than the combination of two ICI drugs.

CONCLUSIONS

Various ICI regimens in cancer patients exhibit clinically significant differences in the risks of TEEs. Nivolumab exhibited a favorable safety profile regarding VTE, while ipilimumab had the highest risk of both VTE and PE. Different ICI regimens require tailored risk management strategies to reduce TEEs.

Efficacy and Safety of Rivaroxaban for Extremely Aged Patients with Venous Thromboembolism: A Retrospective, Cross-Sectional Real-World Study

Background

Rivaroxaban, a non-vitamin K antagonist oral anticoagulant, has become widely used for the management of venous thromboembolism (VTE) in adult patients. However, few trials have explored the efficacy and safety of rivaroxaban in VTE patients over 80 years of age. This necessitates further real-world studies of rivaroxaban across elderly populations.

Methods

We performed a retrospective single center study involving extremely aged VTE sufferers treated with rivaroxaban. The sample comprised 121 patients newly initiated on rivaroxaban diagnosed between January 2018 and January 2020. Patients were followed up for no less than 2 years. The effectiveness outcome was the disappearance of thromboembolism. The safety outcome was the incidence of major bleeding events. Comorbidities and complications were recorded throughout the entire study.

Results

The efficacy outcome occurred in 114 of 121 patients (94.21%) and the safety outcome occurred in 12 of 121 patients (9.91%). Increased hemorrhages were observed in patients with infection (15.15% vs 7.80%), but no significant difference was observed due to limited sample size (P=0.3053). Patients with an age-adjusted Charlson comorbidity index score higher than 6 points exhibited higher bleeding rates (14.08% vs 4.00%; P=0.0676) and lower thrombus cure rates (88.73% vs 100%; P=0.0203).

Key conclusions

Patients with infection should be more careful of bleeding events during rivaroxaban therapy. An age-adjusted Charlson comorbidity index score higher than 6, which predicted poor survival, indicated inferior safety and efficacy of rivaroxaban.

Aim

To investigate the efficacy and safety of Rivaroxaban in an aged venous thromboembolism patient population under real-world conditions.

2024 Heart Disease and Stroke Statistics: A Report of US and Global Data From the American Heart Association

BACKGROUND

The American Heart Association (AHA), in conjunction with the National Institutes of Health, annually reports the most up-to-date statistics related to heart disease, stroke, and cardiovascular risk factors, including core health behaviors (smoking, physical activity, nutrition, sleep, and obesity) and health factors (cholesterol, blood pressure, glucose control, and metabolic syndrome) that contribute to cardiovascular health. The AHA Heart Disease and Stroke Statistical Update presents the latest data on a range of major clinical heart and circulatory disease conditions (including stroke, brain health, complications of pregnancy, kidney disease, congenital heart disease, rhythm disorders, sudden cardiac arrest, subclinical atherosclerosis, coronary heart disease, cardiomyopathy, heart failure, valvular disease, venous thromboembolism, and peripheral artery disease) and the associated outcomes (including quality of care, procedures, and economic costs).

METHODS

The AHA, through its Epidemiology and Prevention Statistics Committee, continuously monitors and evaluates sources of data on heart disease and stroke in the United States and globally to provide the most current information available in the annual Statistical Update with review of published literature through the year before writing. The 2024 AHA Statistical Update is the product of a full year's worth of effort in 2023 by dedicated volunteer clinicians and scientists, committed government professionals, and AHA staff members. The AHA strives to further understand and help heal health problems inflicted by structural racism, a public health crisis that can significantly damage physical and mental health and perpetuate disparities in access to health care, education, income, housing, and several other factors vital to healthy lives. This year's edition includes additional global data, as well as data on the monitoring and benefits of cardiovascular health in the population, with an enhanced focus on health equity across several key domains.

RESULTS

Each of the chapters in the Statistical Update focuses on a different topic related to heart disease and stroke statistics.

CONCLUSIONS

The Statistical Update represents a critical resource for the lay public, policymakers, media professionals, clinicians, health care administrators, researchers, health advocates, and others seeking the best available data on these factors and conditions.

Heart Disease and Stroke Statistics-2023 Update: A Report From the American Heart Association

BACKGROUND

The American Heart Association, in conjunction with the National Institutes of Health, annually reports the most up-to-date statistics related to heart disease, stroke, and cardiovascular risk factors, including core health behaviors (smoking, physical activity, diet, and weight) and health factors (cholesterol, blood pressure, and glucose control) that contribute to cardiovascular health. The Statistical Update presents the latest data on a range of major clinical heart and circulatory disease conditions (including stroke, congenital heart disease, rhythm disorders, subclinical atherosclerosis, coronary heart disease, heart failure, valvular disease, venous disease, and peripheral artery disease) and the associated outcomes (including quality of care, procedures, and economic costs).

METHODS

The American Heart Association, through its Epidemiology and Prevention Statistics Committee, continuously monitors and evaluates sources of data on heart disease and stroke in the United States to provide the most current information available in the annual Statistical Update with review of published literature through the year before writing. The 2023 Statistical Update is the product of a full year's worth of effort in 2022 by dedicated volunteer clinicians and scientists, committed government professionals, and American Heart Association staff members. The American Heart Association strives to further understand and help heal health problems inflicted by structural racism, a public health crisis that can significantly damage physical and mental health and perpetuate disparities in access to health care, education, income, housing, and several other factors vital to healthy lives. This year's edition includes additional COVID-19 (coronavirus disease 2019) publications, as well as data on the monitoring and benefits of cardiovascular health in the population, with an enhanced focus on health equity across several key domains.

RESULTS

Each of the chapters in the Statistical Update focuses on a different topic related to heart disease and stroke statistics.

CONCLUSIONS

The Statistical Update represents a critical resource for the lay public, policymakers, media professionals, clinicians, health care administrators, researchers, health advocates, and others seeking the best available data on these factors and conditions.

Provider education program on the Khorana score to promote venous thromboembolism chemoprophylaxis in patients with gynecologic cancer

Objective

To evaluate the efficacy of a healthcare improvement initiative to improve provider compliance with the American Society of Clinical Oncology (ASCO) guidelines for venous thromboembolism chemoprophylaxis in patients with gynecologic cancer receiving chemotherapy.

Methods

A healthcare improvement initiative was implemented at our institution to improve compliance with American Society of Clinical Oncology venous thromboembolism chemoprophylaxis guidelines in patients receiving chemotherapy with a Khorana score ≥2. Baseline Khorana score and venous thromboembolism data were retrospectively collected for chemotherapy-naïve patients with gynecologic cancer initiating chemotherapy between December 2018 and November 2019. Data for the post-intervention period from December 2019 to December 2020 were captured prospectively. Primary outcome was compliance with American Society of Clinical Oncology guidelines. Secondary outcomes were incidence of venous thromboembolism and complications surrounding venous thromboembolism chemoprophylaxis.

Results

We identified 62 patients in the pre-implementation cohort. Approximately half had a Khorana score of ≥2 (52%). Median Khorana score was 2 (range 1–4). None of these patients received prophylactic chemoprophylaxis. Seven (11%) of these patients were diagnosed with venous thromboembolism. Multivariate logistic regression showed increasing Khorana score was associated with increased venous thromboembolism risk (OR 4.9, p=0.01). With cut-off Khorana score of 2, there was no significant increase in venous thromboembolism. However, with a cut-off Khorana score of 3, patients were 15 times more likely to have venous thromboembolism (OR 15.2, p=0.04). In the post-intervention cohort, 22 patients were eligible for chemoprophylaxis and 11 patients were given anticoagulation (50% compliance with guidelines), with no incidence of venous thromboembolism or adverse effects of therapy noted among those receiving chemoprophylaxis.

Conclusion

Notifying providers of a patient’s Khorana score improves compliance with American Society of Clinical Oncology guidelines for venous thromboembolism chemoprophylaxis among chemotherapy patients.

[What the (general and abdominal) surgeon should know about thrombosis prophylaxis]

A persisting problem in the clinical operative routine is surgery-associated venous thromboembolisms with the possible complications. The competent and reliably realized prophylaxis of thromboembolism is part of the original and elementary tasks of the surgeon, both the operator as well as the clinically active physician. Many preventive approaches were developed and established in the daily management but a residual risk for development of thrombosis still remains. Under this aspect a search was carried out particularly with respect to scientific literature with review and guideline character on the topic of risk stratification, prophylactic procedures in general and for specific indications.

Simultaneous multiparameter whole blood hemostasis assessment using a carbon nanotube-paper composite capacitance sensor

Rapid and accurate clinical assessment of hemostasis is essential for managing patients who undergo invasive procedures, experience hemorrhages, or receive antithrombotic therapies. Hemostasis encompasses an ensemble of interactions between the cellular and non-cellular blood components, but current devices assess only partial aspects of this complex process. In this work, we describe the development of a new approach to simultaneously evaluate coagulation function, platelet count or function, and hematocrit using a carbon nanotube-paper composite (CPC) capacitance sensor. CPC capacitance response to blood clotting at 1.3 MHz provided three sensing parameters with distinctive sensitivities towards multiple clotting elements. Whole blood-based hemostasis assessments were conducted to demonstrate the potential utility of the developed sensor for various hemostatic conditions, including pathological conditions, such as hemophilia and thrombocytopenia. Results showed good agreements when compared to a conventional thromboelastography. Overall, the presented CPC capacitance sensor is a promising new biomedical device for convenient non-contact whole-blood based comprehensive hemostasis evaluation.

Venous thromboembolism incidence and risk assessment in lung cancer patients treated with immune checkpoint inhibitors

BACKGROUND

There are scarce data on venous thromboembolism (VTE) rates among non-small cell lung cancer (NSCLC) patients treated with immune-checkpoint inhibitors (ICI). The Khorana Score (KS), used to guide thromboprophylaxis in cancer patients, was validated in patients receiving chemotherapy.

OBJECTIVE

To assess VTE rates and KS performance among NSCLC patients treated with ICI or chemotherapy.

METHODS

We performed a retrospective cohort study of NSCLC patients starting either ICI or platinum-based chemotherapy. The 6-month cumulative incidence of VTE in the ICI and chemotherapy cohorts and hazard ratios (HR) with 95% confidence intervals (CI) were calculated, using death as a competing risk. Subgroup analysis of low (0-1) and high (≥2) KS risk groups was performed.

RESULTS

The study included 345 NSCLC patients receiving single agent ICI (n = 176) or chemotherapy (n = 169). The 6-month cumulative incidence of VTE was 7.1% in the chemotherapy cohort and 4.5% in the ICI cohort (HR for chemotherapy = 1.6, 95% CI 0.66-3.9). Among chemotherapy treated patients, the high-risk KS group had a trend toward a higher VTE incidence, compared with patients with a low-risk KS (HR 3.04, 95% CI 0.82-11.22). Among ICI-treated patients, the high-risk KS group had a trend toward a lower VTE incidence compared with the low-risk group (HR 0.17, 95% CI 0.02-1.36).

CONCLUSIONS

VTE rates were higher among NSCLC patients treated with platinum-based chemotherapy than those treated with ICI alone, though the precision of the relative estimate is low. The KS did not identify high-risk ICI-treated patients, suggesting that an ICI-specific risk model is warranted.

Initial Experience with Apixaban for Extended Venous Thromboembolism Prophylaxis After Radical Cystectomy

Patients who undergo radical cystectomy (RC) are at elevated risk of venous thromboembolism and associated morbidity and mortality. Guidelines recommend extended thromboprophylaxis (ETP), typically with heparins, but adherence is low. Outside urology, low-dose apixaban has been used for postoperative ETP with success. We describe our first experiences with low-dose apixaban for ETP after RC for bladder cancer. In our sample of 72 patients who underwent RC for cancer and subsequently received apixaban 2.5 mg twice daily for ETP, there were no symptomatic thromboembolic events and no major bleeding events. Other complication rates were in line with historical reports. Our experience with apixaban 2.5 mg twice daily for ETP after RC demonstrates safety and potential efficacy. A transition from injectable to oral thromboprophylaxis has the potential to improve adherence and patient satisfaction, while allowing the possibility of further extending prophylaxis beyond 28 d, which may be beneficial in selected patients. Further evaluation of apixaban for thromboprophylaxis in urologic cancer surgery is warranted. PATIENT SUMMARY: Home injectable heparin is used for 4 weeks after bladder removal surgery to prevent blood clots. We evaluated our use of the oral medication apixaban for prevention of blood clots after bladder removal surgery and found that none of our patients had major bleeding events or symptomatic blood clots. We conclude that there should be further evaluation of the use of oral instead of injectable medication to prevent blood clots after urology surgery.

The cancer patient and cardiology

Advances in cancer treatments have improved clinical outcomes, leading to an increasing population of cancer survivors. However, this success is associated with high rates of short- and long-term cardiovascular (CV) toxicities. The number and variety of cancer drugs and CV toxicity types make long-term care a complex undertaking. This requires a multidisciplinary approach that includes expertise in oncology, cardiology and other related specialties, and has led to the development of the cardio-oncology subspecialty. This paper aims to provide an overview of the main adverse events, risk assessment and risk mitigation strategies, early diagnosis, medical and complementary strategies for prevention and management, and long-term follow-up strategies for patients at risk of cancer therapy-related cardiotoxicities. Research to better define strategies for early identification, follow-up and management is highly necessary. Although the academic cardio-oncology community may be the best vehicle to foster awareness and research in this field, additional stakeholders (industry, government agencies and patient organizations) must be involved to facilitate cross-discipline interactions and help in the design and funding of cardio-oncology trials. The overarching goals of cardio-oncology are to assist clinicians in providing optimal care for patients with cancer and cancer survivors, to provide insight into future areas of research and to search for collaborations with industry, funding bodies and patient advocates. However, many unmet needs remain. This document is the product of brainstorming presentations and active discussions held at the Cardiovascular Round Table workshop organized in January 2020 by the European Society of Cardiology.

Prophylaxis of thromboembolism during therapy with asparaginase in adults with acute lymphoblastic leukaemia

BACKGROUND

The risk of venous thromboembolism is increased in adults and enhanced by asparaginase-based chemotherapy, and venous thromboembolism introduces a secondary risk of treatment delay and premature discontinuation of key anti-leukaemic agents, potentially compromising survival. Yet, the trade-off between benefits and harms of primary thromboprophylaxis in adults with acute lymphoblastic leukaemia (ALL) treated according to asparaginase-based regimens is uncertain.  OBJECTIVES: The primary objectives were to assess the benefits and harms of primary thromboprophylaxis for first-time symptomatic venous thromboembolism in adults with ALL receiving asparaginase-based therapy compared with placebo or no thromboprophylaxis. The secondary objectives were to compare the benefits and harms of different groups of primary systemic thromboprophylaxis by stratifying the main results per type of drug (heparins, vitamin K antagonists, synthetic pentasaccharides, parenteral direct thrombin inhibitors, direct oral anticoagulants, and blood-derived products for antithrombin substitution).

SEARCH METHODS

We conducted a comprehensive literature search on 02 June 2020, with no language restrictions, including (1) electronic searches of Pubmed/MEDLINE; Embase/Ovid; Scopus/Elsevier; Web of Science Core Collection/Clarivate Analytics; and Cochrane Central Register of Controlled Trials (CENTRAL) and (2) handsearches of (i) reference lists of identified studies and related reviews; (ii) clinical trials registries (ClinicalTrials.gov registry; the International Standard Randomized Controlled Trial Number (ISRCTN) registry; the World Health Organisation's International Clinical Trials Registry Platform (ICTRP); and pharmaceutical manufacturers of asparaginase including Servier, Takeda, Jazz Pharmaceuticals, Ohara Pharmaceuticals, and Kyowa Pharmaceuticals), and (iii) conference proceedings (from the annual meetings of the American Society of Hematology (ASH); the European Haematology Association (EHA); the American Society of Clinical Oncology (ASCO); and the International Society on Thrombosis and Haemostasis (ISTH)). We conducted all searches from 1970 (the time of introduction of asparaginase in ALL treatment). We contacted the authors of relevant studies to identify any unpublished material, missing data, or information regarding ongoing studies.

SELECTION CRITERIA

Randomised controlled trials (RCTs); including quasi-randomised, controlled clinical, cross-over, and cluster-randomised trial designs) comparing any parenteral/oral preemptive anticoagulant or mechanical intervention with placebo or no thromboprophylaxis, or comparing two different pre-emptive anticoagulant interventions in adults aged at least 18 years with ALL treated according to asparaginase-based chemotherapy regimens. For the description of harms, non-randomised observational studies with a control group were eligible for inclusion.  DATA COLLECTION AND ANALYSIS: Using a standardised data collection form, two review authors independently screened and selected studies, extracted data, assessed risk of bias for each outcome using standardised tools (RoB 2.0 tool for RCTs and ROBINS-I tool for non-randomised studies) and the certainty of evidence for each outcome using the GRADE approach. Primary outcomes included first-time symptomatic venous thromboembolism, all-cause mortality, and major bleeding. Secondary outcomes included asymptomatic venous thromboembolism, venous thromboembolism-related mortality, adverse events (i.e. clinically relevant non-major bleeding and heparin-induced thrombocytopenia for trials using heparins), and quality of life. Analyses were performed according to the guidelines of the Cochrane Handbook for Systematic Reviews of Interventions. For non-randomised studies, we evaluated all studies (including studies judged to be at critical risk of bias in at least one of the ROBINS-I domains) in a sensitivity analysis exploring confounding.  MAIN RESULTS: We identified 23 non-randomised studies that met the inclusion criteria of this review, of which 10 studies provided no outcome data for adults with ALL. We included the remaining 13 studies in the 'Risk of bias' assessment, in which we identified invalid control group definition in two studies and judged outcomes of nine studies to be at critical risk of bias in at least one of the ROBINS-I domains and outcomes of two studies at serious risk of bias. We did not assess the benefits of thromboprophylaxis, as no RCTs were included. In the main descriptive analysis of harms, we included two retrospective non-randomised studies with outcomes judged to be at serious risk of bias. One study evaluated antithrombin concentrates compared to no antithrombin concentrates. We are uncertain whether antithrombin concentrates have an effect on all-cause mortality (risk ratio (RR) 0.55, 95% confidence interval (CI) 0.26 to 1.19 (intention-to-treat analysis); one study, 40 participants; very low certainty of evidence). We are uncertain whether antithrombin concentrates have an effect on venous thromboembolism-related mortality (RR 0.10, 95% CI 0.01 to 1.94 (intention-to-treat analysis); one study, 40 participants; very low certainty of evidence). We do not know whether antithrombin concentrates have an effect on major bleeding, clinically relevant non-major bleeding, and quality of life in adults with ALL treated with asparaginase-based chemotherapy, as data were insufficient. The remaining study (224 participants) evaluated prophylaxis with low-molecular-weight heparin versus no prophylaxis. However, this study reported insufficient data regarding harms including all-cause mortality, major bleeding, venous thromboembolism-related mortality, clinically relevant non-major bleeding, heparin-induced thrombocytopenia, and quality of life. In the sensitivity analysis of harms, exploring the effect of confounding, we also included nine non-randomised studies with outcomes judged to be at critical risk of bias primarily due to uncontrolled confounding. Three studies (179 participants) evaluated the effect of antithrombin concentrates and six studies (1224 participants) evaluated the effect of prophylaxis with different types of heparins. When analysing all-cause mortality; venous thromboembolism-related mortality; and major bleeding (studies of heparin only) including all studies with extractable outcomes for each comparison (antithrombin and low-molecular-weight heparin), we observed small study sizes; few events; wide CIs crossing the line of no effect; and substantial heterogeneity by visual inspection of the forest plots. Although the observed heterogeneity could arise through the inclusion of a small number of studies with differences in participants; interventions; and outcome assessments, the likelihood that bias due to uncontrolled confounding was the cause of heterogeneity is inevitable. Subgroup analyses were not possible due to insufficient data.  AUTHORS' CONCLUSIONS: We do not know from the currently available evidence, if thromboprophylaxis used for adults with ALL treated according to asparaginase-based regimens is associated with clinically appreciable benefits and acceptable harms. The existing research on this question is solely of non-randomised design, seriously to critically confounded, and underpowered with substantial imprecision. Any estimates of effect based on the existing insufficient evidence is very uncertain and is likely to change with future research.