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Research ArticleClinical Studies

Direct Oral Anticoagulants for the Treatment of Venous Thromboembolism in Patients With Active Cancer

MISATO OGATA, YUMI AMA, TAKATSUGU OGATA, MASAKI HIRABATAKE, HISATERU YASUI and HIRONAGA SATAKE
In Vivo September 2021, 35 (5) 2747-2753; DOI: https://doi.org/10.21873/invivo.12559
MISATO OGATA
1Department of Medical Oncology, Kobe City Medical Center General Hospital, Kobe, Japan;
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YUMI AMA
2Department of Pharmacy, Kobe City Medical Center General Hospital, Kobe, Japan;
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TAKATSUGU OGATA
1Department of Medical Oncology, Kobe City Medical Center General Hospital, Kobe, Japan;
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MASAKI HIRABATAKE
2Department of Pharmacy, Kobe City Medical Center General Hospital, Kobe, Japan;
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HISATERU YASUI
1Department of Medical Oncology, Kobe City Medical Center General Hospital, Kobe, Japan;
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HIRONAGA SATAKE
1Department of Medical Oncology, Kobe City Medical Center General Hospital, Kobe, Japan;
3Cancer Treatment Center, Kansai Medical University Hospital, Osaka, Japan
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  • For correspondence: takeh1977@gmail.com
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Abstract

Background/Aim: Although direct oral anti - coagulants (DOACs) are as safe and effective as conventional anticoagulants for treating venous thromboembolism (VTE), we have insufficient evidence justifying their use in patients with active cancer. We investigated the safety and effectiveness of DOACs in patients with active cancer. Patients and Methods: To investigate the safety and efficacy of DOACs, we retrospectively extracted 312 consecutive patients with active cancer who were prescribed edoxaban, rivaroxaban or apixaban for VTE. Results: The most common primary cancer sites were the lung, stomach, colon/rectum, hematology, ovary, and pancreas. Fifty patients (16%) discontinued DOACs due to clinically relevant bleeding; major bleeding events occurred in 18 patients (5.4%). Thrombosis reduced or resolved in 144 of 167 evaluable patients (86%). In particular, pulmonary embolism was reduced or resolved in 46 of 50 patients (92%). Conclusion: Our findings revealed that DOACs for cancer-associated VTE are as safe and effective as conventional anticoagulation therapy.

  • Direct oral anticoagulants
  • DOACs
  • cancer associated thrombosis
  • CAT
  • cancer
  • venous thromboembolism
  • pulmonary embolism

Patients with cancer are at an increased risk of venous thromboembolism (VTE), even in the absence of conventional VTE risk factors (1). Patients with cancer account for 20% of patients with VTE, and experience VTE at a rate 4-8 times higher than that of the general population (2, 3). In Japan, among the known risk factors for VTE, a medical history of cancer was found to be the most prevalent, with 27% of patients with VTE having such a history, according to the Japan VTE Treatment Registry (JAVA) study (4). Furthermore, a prospective follow-up study, which measured the 12-month cumulative incidence of recurrent VTE in individuals with and without cancer, showed a hazard ratio of 3.2 for recurrence in patients with cancer (4). Although the molecular basis of this relationship between cancer and VTE remains unclear, the long-term use of effective anticoagulants need to be implemented regardless of the underlying mechanisms. However, patients with cancer and VTE have a 12.4% risk of bleeding per year during anticoagulant therapy, and they have a higher risk of bleeding than non-cancer patients (5). Additionally, VTE itself may be directly responsible for mortality in patients with cancer. Among non-cancer-related causes of death, thrombosis was the leading cause (9.2%) (6). Only 12% of patients in whom cancer was diagnosed at the time of an episode of primary VTE were alive after 1 year, compared to the survival rate of 36% for patients who did not have cancer (p<0.001) (7).

Direct oral anticoagulants (DOACs) include factor IIa inhibitor (dabigatran) and factor Xa inhibitors (edoxaban, rivaroxaban, and apixaban). Among them, edoxaban, rivaroxaban, and apixaban have been approved for treating VTE as well as atrial fibrillation.

According to existing therapeutic guidelines, low-molecular-weight heparin (LMWH) is widely recommended for treating patients with cancer who have VTE (8-10). The American Society of Clinical Oncology Clinical Practice Guideline was updated recently and administering DOACs has become the recommended treatment strategy for initial as well as for long-term anticoagulation therapy, which is a remarkable change. However, three DOACs have been recommended with different guidelines; rivaroxaban is recommended for both initial anticoagulation and long-term anticoagulation, edoxaban for long-term anticoagulation and apixaban is not mentioned. It should be investigated whether these three DOACs can be used equally or whether they should be used differently depending on the type of anticoagulation therapy. In fact, LMWH is not covered by medical insurance for treatment for VTE in Japan; the standard anticoagulant therapy for patients with VTE is continuous intravenous administration of unfractionated heparin (UFH), followed by oral administration of vitamin K antagonists (VKA), warfarin. For VTE treatment with UFH, the activated partial thromboplastin time needs to be measured every 6 h after administering the drug. Warfarin, VKA, requires monitoring the prothrombin time-international normalized ratio (PT-INR), and its interactions with other drugs such as fluorouracil anticancer drugs are often problematic. This suggests that treatment with UFH and warfarin requires more supervision and monitoring than that with DOACs.

DOACs are reportedly as safe and effective as conventional anticoagulants (heparin followed by vitamin K antagonists) for treating VTE (10, 11). DOACs do not require monitoring like UFH or VKA and they have little interaction with other drugs. For these reasons, use of DOACs for patients with cancer is of great interest, and DOACs have often been employed to treat patients with active cancer in clinical practice. Although several clinical trials on the use of DOACs for cancer-associated VTE have been published recently with promising results (12, 13), evidence for the use of DOACs in patients with cancer is still limited. Therefore, in the present study, we assessed the safety and effectiveness of DOACs for treatment of VTE in patients with active cancer. To the best of our knowledge, this is the first study to show actual experience of managing VTE in patients with cancer using edoxaban, rivaroxaban, and apixaban.

Patients and Methods

Patients. We retrospectively collected data from the electronic medical records of patients prescribed both intravenous anticancer drugs and DOACs, namely edoxaban, rivaroxaban, or apixaban, from July 2011 to December 2018 at the Kobe City Medical Center General Hospital. The Institutional Review Board approved this study, and since this was a retrospective investigation, the requirement to obtain informed consent was waived. A patient with active cancer was defined as a patient who had been diagnosed with cancer either at baseline or during the study. The indication for DOACs was VTE (deep vein thrombosis, DVT, and/or pulmonary embolism, PE) or atrial fibrillation. Patients who did not receive intravenous anticancer therapy, who were prescribed DOACs for reasons other than VTE, and whose cancers were not active were excluded.

Outcome assessments. The primary outcome was the rate of clinically relevant bleeding events while receiving DOACs. The secondary outcomes were reasons for drug discontinuation, the relationship between renal function and the bleeding event, and the resolution or improvement rate of the VTE and D-dimer levels. Bleeding was defined as major if it was associated with the need for a blood transfusion (≥2 units of blood), as defined by the International Society on Thrombosis and Hemostasis (14). Adverse events were recorded during the administration of drugs, including bleeding related to DOACs. Resolution and improvement of the thrombus were evaluated using images obtained via vascular ultrasonography and/or computed tomography.

Statistical analysis. Differences in renal function between patients with and without bleeding and the 1-month changes in the D-dimer levels were evaluated using the Student’s t-tests. Differences in the bleeding rates according to the renal function were evaluated using the chi-squared test. All statistical analyses were performed using SPSS 22.0 (IBM Corp., Armonk, NY, USA). All statistical tests were two-tailed, and differences were considered statistically significant if p<0.05.

Ethics approval and consent to participate. This study was carried out in accordance with the Helsinki Declaration and Ethical Guidelines for Clinical Studies and was approved by the institutional review boards of all three participating hospitals, Kobe City Medical Center General Hospital (The reference number, zn190509).

Results

Patients. From July 2011 to December 2018, 312 consecutive patients received edoxaban, rivaroxaban, or apixaban and were included in this study. Specifically, 205 patients received edoxaban, 74 received rivaroxaban, 33 received apixaban, and 14 patients received two or more DOACs during the study period.

The characteristics of these patients at the initiation of DOACs are summarized in Table I. The median age of enrolled patients was 68 years (edoxaban, 69 years; rivaroxaban, 63 years; apixaban, 68 years), 137 patients were men (44%), and the mean creatinine clearance rate (Ccr) was 79.9 ml/min (edoxaban, 78.9 ml/min; rivaroxaban, 86.5 ml/min; apixaban, 70.8 ml/min). The apixaban group had significantly lower renal function than the rivaroxaban group (p=0.02). The primary sites of cancer were the lungs (n=63, 20%), stomach (n=42, 13%), colon/rectum (n=38, 12%), ovary (n=33, 11%), and pancreas (n=14, 4%).

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Table I.

Characteristics of the 312 patients with active cancer and VTE.

In the edoxaban group, 23% of patients started with a dose of 60 mg daily; 74%, with a dose of 30 mg daily; and 3%, with a dose of 15 mg daily. In the rivaroxaban group, 43% of the patients received an initial dose of 15 mg daily, while only 50% percent received 30 mg daily, which is regarded as the recommended initial dose of rivaroxaban. In the apixaban group, 12% received an initial dose of 20 mg daily, 73% received an initial dose of 10 mg daily, and 15% received a reduced initial dose of 5 mg daily.

Safety. During the study period, 56 patients (17.9%) discontinued the oral anticoagulant administration or needed drug change to other DOACs (Table II). The major reason for discontinuation was bleeding (n=50). In the edoxaban group, 31 patients (15.1%) discontinued the drug due to gastrointestinal bleeding (n=8), hemoptysis (n=6), hematuria (n=5), and epistaxis (n=4). In the rivaroxaban group, 12 patients (16.2%) discontinued the drug due to gastrointestinal bleeding (n=3), hematuria (n=3), epistaxis (n=2), and anemia (n=2). In the apixaban group, nine patients (27.3%) discontinued the drug due to gastrointestinal bleeding (n=2), hematuria (n=2), anemia (n=2), epistaxis (n=1), hemorrhagic pleural effusion (n=1), and liver enzyme elevation (n=1). Major bleeding occurred in 18 patients: 11 in the edoxaban group (5.4%), four in the rivaroxaban group (5.4%), and three in the apixaban group (9.1%).

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Table II.

Reasons for drug discontinuation (n=312).

We also compared the relationship between renal function and bleeding rate. Figure 1 shows the comparison of renal function in patients with or without bleeding. In the edoxaban group, the mean (standard deviation, SD) Ccr of patients with bleeding (n=31) was 75.2 (28.8) ml/min and of patients without bleeding (n=174) was 79.6 (33.4) ml/min (p=0.48). In the rivaroxaban group, the mean (SD) Ccr of patients with bleeding (n=11) was 73.8 (28.0) ml/min and that of patients without bleeding (n=63) was 88.7 (30.9) ml/min (p=0.14). In the apixaban group, the mean (SD) Ccr of patients with bleeding (n=8) was 58.9 (24.8) ml/min and that of patients without bleeding (n=25) was 74.7 (25.7) ml/min (p=0.14).

Figure 1.
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Figure 1.

Renal function in patients with or without clinically relevant and major bleeding. (A) Edoxaban (n=205), (B) Rivaroxaban (n=74), (C) Apixaban (n=33). Ccr: Creatinine clearance rate; pts: patients; SD: standard deviation.

Patients in each group were stratified using the renal function and bleeding rate (Figure 2). In the edoxaban group, 14% of patients with a Ccr <50 ml/min, 18% of patients with a ≤50 Ccr <80 ml/min, and 13% of patients with a Ccr ≥80 ml/min experienced bleeding. In the rivaroxaban group, 33% of patients with a Ccr <50 ml/min, 17% of patients with a ≤50 Ccr <80 ml/min, and 8% of patients with a Ccr ≥80 ml/min experienced bleeding. In the apixaban group, 50% of patients with a Ccr <50 ml/min, 15% of patients with a ≤50 Ccr <80 ml/min, and 17% of patients with a Ccr ≥80 ml/min experienced bleeding.

Figure 2.
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Figure 2.

Clinically relevant and major bleeding classified based on renal function. (A) Edoxaban (n=205), (B) Rivaroxaban (n=74), (C) Apixaban (n=33). Ccr: Creatinine clearance rate; ns: not significant.

Efficacy. We were able to evaluate the efficacy of the DOACs in 167 patients; 144 (86.2%) patients showed reduction or resolution of VTE. In the edoxaban group, thrombosis reduced or resolved in 88 of the 106 evaluated patients (83.0%). PE resolved in 19 and reduced in 8 of the 29 patients (93.1%). In the rivaroxaban group, thrombosis was reduced or resolved in 44 of the 48 evaluated patients (91.7%). PE resolved in 15 and reduced in 2 of the 19 patients (89.5%). In the apixaban group, thrombosis showed an improvement in 12 of the 13 evaluated patients (92.3%) who were evaluated. PE resolved in two patients (100%) (Table III).

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Table III.

Effectiveness of DOACs (n=167).

Changes in the D-dimer levels from DOAC initiation to 1 month later were also assessed in this study (Figure 3). The mean value of the D-dimer levels in the edoxaban group decreased from 11.5 to 6.9 μg/ml (p=0.04), that in the rivaroxaban group decreased from 13.4 to 4.9 μg/ml (p=0.0004) and that in the apixaban group decreased from 17.2 to 3.3 μg/ml (p=0.019) after 1 month of DOAC administration.

Figure 3.
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Figure 3.

D-dimer levels at direct oral anticoagulant (DOAC) initiation and 1 month after DOAC initiation. (A) Edoxaban (n=205), (B) Rivaroxaban (n=74), (C) Apixaban (n=33).

Discussion

We found that DOACs for cancer-associated VTE appear to be as safe and effective as conventional anticoagulation therapy. The present study is clinically significant because it describes the actual experience of managing VTE in patients with active cancer.

From the safety point, we reviewed the rate of major bleeding reported in each clinical trial. In the Hokusai VTE Cancer study, major bleeding occurred in 6.9% patients when using edoxaban for cancer VTE compared with 4.0% in the dalteparin group (95% CI=0.1-5.6). Rivaroxaban has a reduced rate of major bleeding events compared to the combination therapy of heparin and warfarin in the general population (15), as well as in patients with cancer, according to a subgroup analysis (16). The J-EINSTEIN DVT/PE study reported the bleeding rates and reduction or resolution rate of DVT/PE in Japanese patients (17). The SELECT-D study reported major bleeding in 5.4% patients in the rivaroxaban group compared with 3.0% patients in the dalteparin group (18). Apixaban use for cancer-associated VTE has recently been published and no major bleeding was observed in the apixaban group (19). However, a systematic review of the use of DOACs using meta-analysis for the treatment of cancer-associated VTE found that DOACs may increase major bleeding (20). In the current analysis, major bleeding, as defined by the International Society on Thrombosis and Hemostasis, was observed in 11 (5.4%) in the edoxaban group, a result similar to that of the Hokusai VTE Cancer study (6.9%); four (5.4%) were in the rivaroxaban group, a result similar to that of the SELECT-D study (5.4%); and three (9.1%) were in the apixaban group. Although apixaban was administered to a small number of patients in our study, we should be careful in making the direct comparison with clinical trial. Considering that this study collected the actual experience in Japan, we can confidently say that DOACS can also be used safely in patients with cancer.

The next concern is whether DOACs are effective. We evaluated the efficacy by imaging the changes in the thrombus and assessing D-dimer levels. In our study, thrombosis reduced or resolved in 144 out of 167 evaluable patients (86%) and PE resolved in 46 out of 50 patients (92%). In the J-EINSTEIN DVT/PE study, despite the small number of cancer patients at high risk of DVT and bleeding, the results were similar to those of our study (17). The AMPLIFY study also showed similar results (21). In our study, because the treatment period at the time of imaging evaluation differed significantly, the interpretation is limited. Furthermore, clinical trials on both rivaroxaban and apixaban have confirmed the usefulness of initial treatment using a single-drug approach. In our study, rivaroxaban was administered as a single drug in 72 of 74 patients and apixaban in 30 of 33 patients. Edoxaban was also administered as a single-drug approach in 184 of 205 patients. This suggests that VTE in cancer patients may be easier to manage with DOACs, with similar effectiveness and safety, than with the conventional anti-coagulant therapies. D-dimers were surveyed at DOAC initiation and 1 month later, and patients in all the groups exhibited reduced D-dimer levels 1 month after DOAC initiation. This finding also supports the effectiveness of DOACs in reducing the risk of VTE recurrence.

The other difference regarding these three DOACs is that edoxaban and apixaban require dose modification according to the patient’s renal function, whereas rivaroxaban does not. However, because rivaroxaban clearance decreases with increasing renal impairment (22), rivaroxaban actually requires dose modification when administered for atrial fibrillation and in the interest of the safety of patients with reduced renal function. In fact, the rate of bleeding was significantly different between patients in the rivaroxaban group with a Ccr <50 ml/min and those with a Ccr <80 ml/min. Nevertheless, it is unclear whether this result is clinically significant because of the small sample size. This aspect should be studied in the future to ensure the proper and safe management of VTE in patients with reduced renal function.

Limitations of our study include that it was conducted retrospectively at a single institution, that the number of included patients varies among treatments with the three drugs and that the efficacy of the DOACs was not evaluated in all patients.

Conclusion

In conclusion, our findings suggest that DOACs may be as safe and effective as the conventional anticoagulation therapy for VTE treatment. Further studies are needed to clarify the safety and effectiveness of other DOACs.

Acknowledgements

We would like to thank the patients and families who participated in this study.

Footnotes

  • This article is freely accessible online.

  • Author’s Contributions

    Conceptualization: H.S. Data acquisition: M.O., H.S., Y.A., T.O., M.H., H.Y. Manuscript preparation: M.O., H.S. Manuscript editing: M.O., H.S. Manuscript review: All Authors.

  • Conflicts of Interest

    Hironaga Satake has received research funding from Ono Pharmaceutical Co. Ltd., Daiichi Sankyo, Taiho Pharmaceutical Co., Ltd., Takeda Pharmaceutical Co., Ltd. and Sanofi, honoraria from Bayer Co., Ltd., Bristol-Myers Squibb Co., Ltd., Chugai Pharmaceutical Co., Ltd., Daiichi Sankyo Co., Ltd., Eli Lilly Japan Co., Ltd., Merck Bio Pharma Co., Ltd., MSD Co., Ltd., Ono Pharmaceutical Co., Ltd., Sanofi Co., Ltd., Taiho Pharmaceutical Co., Ltd., Takeda Co., Ltd. and Yakult Honsha Co., Ltd.

    Hisateru Yasui has received research funding from MSD, Daiichi Sankyo, and Ono Pharmaceutical, honoraria from Taiho Pharmaceutical, Chugai Pharma, Bristol-Myers Squibb Japan, Daiichi Sankyo, TERUMO, Eli Lilly Japan, Merck Biopharma, and Yakult Honsha. All remaining authors have declared no conflict of interest.

  • Received May 31, 2021.
  • Revision received June 25, 2021.
  • Accepted July 8, 2021.
  • Copyright © 2021 International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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In Vivo: 35 (5)
In Vivo
Vol. 35, Issue 5
September-October 2021
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Direct Oral Anticoagulants for the Treatment of Venous Thromboembolism in Patients With Active Cancer
MISATO OGATA, YUMI AMA, TAKATSUGU OGATA, MASAKI HIRABATAKE, HISATERU YASUI, HIRONAGA SATAKE
In Vivo Sep 2021, 35 (5) 2747-2753; DOI: 10.21873/invivo.12559

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Direct Oral Anticoagulants for the Treatment of Venous Thromboembolism in Patients With Active Cancer
MISATO OGATA, YUMI AMA, TAKATSUGU OGATA, MASAKI HIRABATAKE, HISATERU YASUI, HIRONAGA SATAKE
In Vivo Sep 2021, 35 (5) 2747-2753; DOI: 10.21873/invivo.12559
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Keywords

  • Direct oral anticoagulants
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  • Venous thromboembolism
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