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Cochrane Database of Systematic Reviews

Parenteral anticoagulation in ambulatory patients with cancer

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DOI:
https://doi.org/10.1002/14651858.CD006652.pub5Copiar DOI
Base de datos:
  1. Cochrane Database of Systematic Reviews
Versión publicada:
  1. 11 septiembre 2017see what's new
Tipo:
  1. Intervention
Etapa:
  1. Review
Grupo Editorial Cochrane:
  1. Grupo Cochrane de Cáncer ginecológico, neurooncología y otros cánceres

Copyright:
  1. Copyright © 2023 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd.

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Autores

  • Elie A Akl

    Correspondencia a: Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon

    [email protected]

  • Lara A Kahale

    Faculty of Medicine, American University of Beirut, Beirut, Lebanon

  • Maram B Hakoum

    Family Medicine, American University of Beirut, Beirut, Lebanon

  • Charbel F Matar

    Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon

  • Francesca Sperati

    Biostatistics-Scientific Direction, Regina Elena National Cancer Institute, Rome, Italy

  • Maddalena Barba

    Division of Medical Oncology 2 - Scientific Direction, IRCCS Regina Elena National Cancer Institute, Rome, Italy

  • Victor ED Yosuico

    Buffalo Medical Group, Buffalo, USA

  • Irene Terrenato

    Biostatistics-Scientific Direction, IRCCS Regina Elena National Cancer Institute, Rome, Italy

  • Anneliese Synnot

    Cochrane Australia, School of Public Health and Preventive Medicine, Monash University, Melbourne, Australia

    Cochrane Consumers and Communication, Centre for Health Communication and Participation, School of Psychology and Public Health, La Trobe University, Bundoora, Australia

  • Holger Schünemann

    Departments of Health Research Methods, Evidence, and Impact and of Medicine, McMaster University, Hamilton, Canada

Contributions of authors

EAA: protocol development, data analysis, manuscript drafting, methodological expertise, review co‐ordination. LAK: searching for trials, screening, data extraction, data analysis, manuscript drafting, review co‐ordination. MH: screening, full‐text retrieval, data extraction, manuscript drafting. CM: screening, full‐text retrieval, data extraction. MB: screening, full‐text retrieval, data extraction. FS: screening, full‐text retrieval, data extraction. IT: screening, full‐text retrieval, data extraction.VY: screening, full‐text retrieval, data extraction. AS: methodological expertise related to the living systematic review approach. HJS: protocol development, data interpretation, methodological expertise.

Sources of support

Internal sources

  • No sources of support provided

External sources

  • NIHR Cochrane Review Incentive Scheme 2016. Award reference Number 16/72/24, UK

    This project was supported by the National Institute for Health Research, via Cochrane Review Incentive Scheme Funding. The views and opinions expressed therein are those of the authors and do not necessarily reflect those of the Systematic Reviews Programme, NIHR, NHS or the Department of Health.

  • Cochrane Gamechanger Grant, UK

    Anneliese Synnot's position is supported by funding through Cochrane's Gamechanger grant

  • National Health and Medical Research Council (Partnership Project grant APP1114605), Australia

    Anneliese Synnot's position is supported by funding through Australia's National Health and Medical Research Council.

  • American Society of Hematology, USA

    This project was supported by the American Society of Hematology

Declarations of interest

HJS: panel member of the ASH VTE in cancer patients, Vice‐Chair of the ASH VTE guidelines and played various leadership roles from 1999 until 2014 with ACCP VTE guidelines. EAA served on the executive committee the ACCP Antithrombotic Therapy Guidelines published in 2016. All other co‐authors declare no conflicts of interests.

Acknowledgements

We thank Ms. Ann Grifasi for her administrative support. We thank Dr. Loprinzi and Dr. Paul Novotny of the Mayo Clinic for supplying additional data relating to the study Sideras 2006. We also thank Dr. Lebeau, Dr. Altinbas and Dr. Pelzer for supplying additional data. We thank Rami A Ballout, Andrew Bryant, Heather Dickinson, Sameer K Gunukula, Saskia Kuipers and Saskia Middeldorp, and, Frederiek F van Doormaal for their contributions to previous versions of this review. We also thank Dr. Assem Khamis for his help with conducting the sensitivity analysis.

We thank Jo Morrison, Co‐ordinating Editor for the Cochrane Gynaecological Neuro‐oncology and Orphan Cancers (CGNOC). We also thank Gail Quinn, Managing Editor of the CGNOC for her exceptional support. We thank Joanne Platt, the Information Specialist of the CGNOC for setting up and managing the monthly alerts.

As described under “Sources of Support” this update was supported in part by the American Society of Hematology to inform ASH guidelines on the topic. We thank the ASH guideline panel for prioritizing questions previously addressed by our review and for critically reviewing our work, including Drs. Pablo Alonso, Waleed Alhazanni, Marc Carrier, Cihan Ay, Marcello DiNisio, Lisa Hicks, Alok Khorana, Andrew Leavitt, Agnes Lee, Gary Lyman, Fergus Macbeth, Rebecca Morgan, Simon Noble, and David Stenehjem and patient representatives Jackie Cook and Elizabeth Sexton. Their input was valuable in validating some of the review related decisions such as eligibility of included studies and the analytical approach.

For our update of these reviews, we followed Cochrane methods using the same eligibility criteria and outcomes used previously. The ASH guidelines group used slightly different methods that generated slightly different results. For example, the ASH guideline panel agreed to prioritize different outcomes; include unpublished data; include abstracts; use different definitions for duration of treatment; and rate certainty of evidence slightly differently for some outcomes, for instance because of imprecision or indirectness. These differences are not described in this publication. Instead, they will be described in the ASH guideline publication.

This project was supported by the National Institute for Health Research, via Cochrane Review Incentive Scheme Funding. The views and opinions expressed therein are those of the authors and do not necessarily reflect those of the Systematic Reviews Programme, NIHR, NHS or the Department of Health. Anneliese Synnot's position is funded through Cochrane's Gamechanger Grant and Australia's National Health and Medical Research Council (Partnership Project grant APP1114605).

Version history

Published

Title

Stage

Authors

Version

2017 Sep 11

Parenteral anticoagulation in ambulatory patients with cancer

Review

Elie A Akl, Lara A Kahale, Maram B Hakoum, Charbel F Matar, Francesca Sperati, Maddalena Barba, Victor ED Yosuico, Irene Terrenato, Anneliese Synnot, Holger Schünemann

https://doi.org/10.1002/14651858.CD006652.pub5

2014 Dec 10

Parenteral anticoagulation in ambulatory patients with cancer

Review

Elie A Akl, Lara A Kahale, Rami A Ballout, Maddalena Barba, Victor E D Yosuico, Frederiek F van Doormaal, Saskia Middeldorp, Andrew Bryant, Holger Schünemann

https://doi.org/10.1002/14651858.CD006652.pub4

2011 Apr 13

Parenteral anticoagulation in patients with cancer who have no therapeutic or prophylactic indication for anticoagulation

Review

Elie A Akl, Sameer Gunukula, Maddalena Barba, Victor E D Yosuico, Frederiek F van Doormaal, Saskia Kuipers, Saskia Middeldorp, Heather O Dickinson, Andrew Bryant, Holger Schünemann

https://doi.org/10.1002/14651858.CD006652.pub3

2011 Jan 19

Parenteral anticoagulation in patients with cancer who have no therapeutic or prophylactic indication for anticoagulation

Review

Elie A Akl, Sameer Gunukula, Maddalena Barba, Victor E D Yosuico, Frederiek F van Doormaal, Saskia Kuipers, Saskia Middeldorp, Heather O Dickinson, Andrew Bryant, Holger Schünemann

https://doi.org/10.1002/14651858.CD006652.pub2

2007 Jul 18

Parenteral anticoagulation for prolonging survival in patients with cancer who have no other indication for anticoagulation

Review

Elie A Akl, Frederiek F van Doormaal, Maddalena Barba, Ganesh Kamath, Seo Young Kim, Saskia Kuipers, Saskia Middeldorp, Victor E D Yosuico, Heather O Dickinson, Holger Schünemann

https://doi.org/10.1002/14651858.CD006652

Differences between protocol and review

This update includes new section relevant to living systematic reviews, which are included in the Methods and also described in Appendix 1.

Keywords

MeSH

PICO

Population
Intervention
Comparison
Outcome

El uso y la enseñanza del modelo PICO están muy extendidos en el ámbito de la atención sanitaria basada en la evidencia para formular preguntas y estrategias de búsqueda y para caracterizar estudios o metanálisis clínicos. PICO son las siglas en inglés de cuatro posibles componentes de una pregunta de investigación: paciente, población o problema; intervención; comparación; desenlace (outcome).

Para saber más sobre el uso del modelo PICO, puede consultar el Manual Cochrane.

Study flow diagram.

Figuras y tablas -
Figure 1

Study flow diagram.

'Risk of bias' graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.

Figuras y tablas -
Figure 2

'Risk of bias' graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.

'Risk of bias' summary: review authors' judgements about each risk of bias item for each included study.

Figuras y tablas -
Figure 3

'Risk of bias' summary: review authors' judgements about each risk of bias item for each included study.

Funnel plot of comparison: 1 Heparin versus placebo, outcome: 1.1 Mortality at 12 months‐ Main analysis.

Figuras y tablas -
Figure 4

Funnel plot of comparison: 1 Heparin versus placebo, outcome: 1.1 Mortality at 12 months‐ Main analysis.

Funnel plot of comparison: 1 Heparin versus placebo, outcome: 1.7 Symptomatic VTE‐ Main analysis.

Figuras y tablas -
Figure 5

Funnel plot of comparison: 1 Heparin versus placebo, outcome: 1.7 Symptomatic VTE‐ Main analysis.

Comparison 1: Heparin versus placebo, Outcome 1: Mortality at 12 months‐ Main analysis

Figuras y tablas -
Analysis 1.1

Comparison 1: Heparin versus placebo, Outcome 1: Mortality at 12 months‐ Main analysis

Comparison 1: Heparin versus placebo, Outcome 2: Mortality at 12 months‐ Subgroups Lung vs non‐Lung Cancer

Figuras y tablas -
Analysis 1.2

Comparison 1: Heparin versus placebo, Outcome 2: Mortality at 12 months‐ Subgroups Lung vs non‐Lung Cancer

Comparison 1: Heparin versus placebo, Outcome 3: Mortality at 12 months‐ Subgroups Advanced vs non‐Advanced

Figuras y tablas -
Analysis 1.3

Comparison 1: Heparin versus placebo, Outcome 3: Mortality at 12 months‐ Subgroups Advanced vs non‐Advanced

Comparison 1: Heparin versus placebo, Outcome 4: Mortality at 24 months‐ Main Analysis

Figuras y tablas -
Analysis 1.4

Comparison 1: Heparin versus placebo, Outcome 4: Mortality at 24 months‐ Main Analysis

Comparison 1: Heparin versus placebo, Outcome 5: Mortality at 24 months‐ Subgroups Advanced vs non‐Advanced

Figuras y tablas -
Analysis 1.5

Comparison 1: Heparin versus placebo, Outcome 5: Mortality at 24 months‐ Subgroups Advanced vs non‐Advanced

Comparison 1: Heparin versus placebo, Outcome 6: Mortality over duration of study

Figuras y tablas -
Analysis 1.6

Comparison 1: Heparin versus placebo, Outcome 6: Mortality over duration of study

Comparison 1: Heparin versus placebo, Outcome 7: Symptomatic VTE‐ Main analysis

Figuras y tablas -
Analysis 1.7

Comparison 1: Heparin versus placebo, Outcome 7: Symptomatic VTE‐ Main analysis

Comparison 1: Heparin versus placebo, Outcome 8: Symptomatic VTE‐ Subgroups Lung vs non‐Lung Cancer

Figuras y tablas -
Analysis 1.8

Comparison 1: Heparin versus placebo, Outcome 8: Symptomatic VTE‐ Subgroups Lung vs non‐Lung Cancer

Comparison 1: Heparin versus placebo, Outcome 9: PE

Figuras y tablas -
Analysis 1.9

Comparison 1: Heparin versus placebo, Outcome 9: PE

Comparison 1: Heparin versus placebo, Outcome 10: Symptomatic DVT

Figuras y tablas -
Analysis 1.10

Comparison 1: Heparin versus placebo, Outcome 10: Symptomatic DVT

Comparison 1: Heparin versus placebo, Outcome 11: Major bleeding‐ Main analysis

Figuras y tablas -
Analysis 1.11

Comparison 1: Heparin versus placebo, Outcome 11: Major bleeding‐ Main analysis

Comparison 1: Heparin versus placebo, Outcome 12: Major bleeding‐ Subgroups Lung vs non‐Lung Cancer

Figuras y tablas -
Analysis 1.12

Comparison 1: Heparin versus placebo, Outcome 12: Major bleeding‐ Subgroups Lung vs non‐Lung Cancer

Comparison 1: Heparin versus placebo, Outcome 13: Minor bleeding

Figuras y tablas -
Analysis 1.13

Comparison 1: Heparin versus placebo, Outcome 13: Minor bleeding

Comparison 1: Heparin versus placebo, Outcome 14: Thrombocytopenia

Figuras y tablas -
Analysis 1.14

Comparison 1: Heparin versus placebo, Outcome 14: Thrombocytopenia

Summary of findings 1. Heparin prophylaxis compared with no prophylaxis in ambulatory patients with cancer without VTE receiving systemic therapy

Heparin prophylaxis compared with no prophylaxis in ambulatory patients with cancer without VTE receiving systemic therapy

P: Ambulatory patients with cancer without VTE receiving systemic therapy

I: Heparin prophylaxis

C: No prophylaxis

S: Outpatient

Outcomes

№ of participants
(studies)
Follow‐up

Quality of the evidence
(GRADE)

Relative effect
(95% CI)

Anticipated absolute effects* (95% CI)

Risk with No prophylaxis

Risk difference with Heparin prophylaxis

Mortality
follow‐up: 12 months

9575
(18 RCTs)

⊕⊕⊕⊝
MODERATE 1

RR 0.98
(0.93 to 1.03)

Study population

504 per 1000

10 fewer per 1000
(35 fewer to 15 more)

Mortality
follow‐up: 24 months

5229
(14 RCTs)

⊕⊕⊕⊝
MODERATE 1

RR 0.99
(0.96 to 1.01)

Study population

778 per 1000

8 fewer per 1000
(31 fewer to 8 more)

Symptomatic VTE
follow‐up: 12 months

9036
(16 RCTs)

⊕⊕⊕⊕
HIGH

RR 0.56
(0.47 to 0.68)

Study population

68 per 1000

30 fewer per 1000
(36 fewer to 22 fewer)

Major bleeding
follow‐up: 12 months

9592
(18 RCTs)

⊕⊕⊕⊝
MODERATE 2

RR 1.30
(0.94 to 1.79)

Study population

14 per 1000

4 more per 1000
(1 fewer to 11 more)

Minor bleeding
follow‐up: 12 months

9245
(16 RCTs)

⊕⊕⊕⊕
HIGH

RR 1.70
(1.13 to 2.55)

Study population

24 per 1000

17 more per 1000
(3 more to 37 more)

Thrombocytopenia

5832
(12 RCTs)

⊕⊕⊕⊝
MODERATE 3

RR 0.69
(0.37 to 1.27)

Study population

105 per 1000

33 fewer per 1000
(66 fewer to 28 more)

Quality of life impairment

2241
(2 RCTs)

⊕⊕⊕⊝
MODERATE 4

Macbeth 2016 (FRAGMATIC): " There was no difference between the two groups with respect to quality‐adjusted life years gained in the first year... No difference in overall quality of life at 6 months (P = .94) or at 12 months (P = .89)... Overall quality of life did not change significantly over the study period".Sideras 2006: "The QOL and SDS scores were similar, both at baseline and during the protocol period, in patients randomized to receive LMWH vs those not randomized to receive LMWH."

*The risk in the intervention group (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI).
CI: Confidence interval; RR: Risk ratio; OR: Odds ratio;

GRADE Working Group grades of evidence
High quality: We are very confident that the true effect lies close to that of the estimate of the effect
Moderate quality: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different
Low quality: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect
Very low quality: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect

1 Downgraded one level due to serious imprecision: Confidence interval includes values suggesting clinically significant benefit and values suggesting no effect.

2 Downgraded one level due to serious imprecision: Confidence interval includes values suggesting clinically significant harm and values suggesting no effect.

3 Downgraded one level due to serious imprecision: Confidence interval includes values suggesting clinically significant benefit and values suggesting harm.

4 Downgraded one level due to serious risk of bias: Both studies were open‐label studies (lack of blinding may impact the patient‐reported subjective outcomes)

Figuras y tablas -
Summary of findings 1. Heparin prophylaxis compared with no prophylaxis in ambulatory patients with cancer without VTE receiving systemic therapy
Table 1. Glossary

Term

Definition

Adjuvant therapy

Assisting in the amelioration or cure of disease

Anticoagulation

The process of hindering the clotting of blood especially by treatment with an anticoagulant

Antithrombotic

Used against or tending to prevent thrombosis (clotting)

Bacteremia

The presence of bacteria in the blood

Central venous line

Synthetic tube that is inserted into a central (large) vein of a patient to provide temporary intravenous access for the administration of fluid, medication or nutrients

Coagulation

Clotting

Deep vein thrombosis (DVT)

A condition marked by the formation of a thrombus within a deep vein (as of the leg or pelvis) that may be asymptomatic or be accompanied by symptoms (such as swelling and pain) and that is potentially life‐threatening if dislodgment of the thrombus results in pulmonary embolism

Fibrin

A white insoluble fibrous protein formed from fibrinogen by the action of thrombin, especially in the clotting of blood

Fondaparinux

An anticoagulant medication

Hemostatic system

The system that shortens the clotting time of blood and stops bleeding

Heparin

An enzyme occurring especially in the liver and lungs that prolongs the clotting time of blood by preventing the formation of fibrin. Two forms of heparin that are used as anticoagulant medications are: unfractionated heparin (UFH) and low molecular weight heparins (LMWH)

Impedance plethysmography

A technique that measures the change in blood volume (venous blood volume as well as the pulsation of the arteries) for a specific body segment

Kappa statistics

A measure of degree of non‐random agreement between observers and/or measurements of a specific categorical variable

Metastasis

The spread of cancer cells from the initial or primary site of disease to another part of the body

Oncogene

A gene having the potential to cause a normal cell to become cancerous

Osteoporosis

A condition that especially affects older women and is characterized by a decrease in bone mass with decreased density and enlargement of bone spaces producing porosity and brittleness

Parenteral nutrition

The practice of feeding a patient intravenously, circumventing the gut

Pulmonary embolism (PE)

Embolism of a pulmonary artery or one of its branches that is produced by foreign matter and most often a blood clot originating in a vein of the leg or pelvis and that is marked by labored breathing, chest pain, fainting, rapid heart rate, cyanosis, shock and sometimes death

Stroma

The supporting framework of an organ typically consisting of connective tissue

Thrombin

A proteolytic enzyme formed from prothrombin that facilitates the clotting of blood by catalyzing conversion of fibrinogen to fibrin

Thrombocytopenia

Persistent decrease in the number of blood platelets that is often associated with hemorrhagic conditions

Thrombosis

The formation or presence of a blood clot within a blood vessel

Vitamin K antagonists

Anticoagulant medications that are used for anticoagulation. Warfarin is a vitamin K antagonist

Warfarin

An anticoagulant medication that is a vitamin K antagonist, which is used for anticoagulation

Ximelagatran

An anticoagulant medication

Figuras y tablas -
Table 1. Glossary
Table 2. LMWH: definitions of prophylactic and therapeutic dosages

LMWH

Generic name

Prophylactic dose

Therapeutic dose

Lovenox

Enoxaparin

40 mg once daily

1 mg/kg twice daily

Fragmin

Dalteparin

2500 to 5000 units once daily

200 U/kg once daily or
100 U/kg twice daily

Innohep, Logiparin

Tinzaparin

4500 units once daily

90 U/kg twice daily

Fraxiparine

Nadroparin

35 to 75 anti‐Xa international units/kg once daily

175 anti‐Xa int. units/kg once daily

Certoparin

Sandoparin

3000 anti‐Xa international units once daily

Figuras y tablas -
Table 2. LMWH: definitions of prophylactic and therapeutic dosages
Comparison 1. Heparin versus placebo

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1.1 Mortality at 12 months‐ Main analysis Show forest plot

18

9575

Risk Ratio (M‐H, Random, 95% CI)

0.98 [0.93, 1.03]

1.2 Mortality at 12 months‐ Subgroups Lung vs non‐Lung Cancer Show forest plot

12

4768

Risk Ratio (M‐H, Random, 95% CI)

0.94 [0.86, 1.03]

1.2.1 Lung Cancer (SCLC or NSCLC)

6

3204

Risk Ratio (M‐H, Random, 95% CI)

0.89 [0.73, 1.08]

1.2.2 non‐Lung Cancer

7

1564

Risk Ratio (M‐H, Random, 95% CI)

0.95 [0.88, 1.03]

1.3 Mortality at 12 months‐ Subgroups Advanced vs non‐Advanced Show forest plot

18

9575

Risk Ratio (M‐H, Random, 95% CI)

0.98 [0.94, 1.03]

1.3.1 Advanced cancer

12

6115

Risk Ratio (M‐H, Random, 95% CI)

0.98 [0.93, 1.02]

1.3.2 Non‐advanced cancer

8

3460

Risk Ratio (M‐H, Random, 95% CI)

0.92 [0.75, 1.12]

1.4 Mortality at 24 months‐ Main Analysis Show forest plot

14

5229

Risk Ratio (M‐H, Random, 95% CI)

0.99 [0.96, 1.01]

1.5 Mortality at 24 months‐ Subgroups Advanced vs non‐Advanced Show forest plot

14

5229

Risk Ratio (M‐H, Random, 95% CI)

0.99 [0.96, 1.01]

1.5.1 Advanced cancer

6

1554

Risk Ratio (M‐H, Random, 95% CI)

0.98 [0.93, 1.03]

1.5.2 Non‐advanced cancer

8

3675

Risk Ratio (M‐H, Random, 95% CI)

0.98 [0.93, 1.04]

1.6 Mortality over duration of study Show forest plot

15

Hazard Ratio (IV, Random, 95% CI)

0.93 [0.84, 1.03]

1.7 Symptomatic VTE‐ Main analysis Show forest plot

16

9036

Risk Ratio (M‐H, Random, 95% CI)

0.56 [0.47, 0.68]

1.8 Symptomatic VTE‐ Subgroups Lung vs non‐Lung Cancer Show forest plot

11

8090

Risk Ratio (M‐H, Random, 95% CI)

0.52 [0.43, 0.63]

1.8.1 Lung Cancer (SCLC or NSCLC)

6

4217

Risk Ratio (M‐H, Random, 95% CI)

0.53 [0.41, 0.68]

1.8.2 Non‐lung cancer

7

3873

Risk Ratio (M‐H, Random, 95% CI)

0.51 [0.37, 0.70]

1.9 PE Show forest plot

14

8867

Risk Ratio (M‐H, Random, 95% CI)

0.61 [0.47, 0.80]

1.10 Symptomatic DVT Show forest plot

14

8867

Risk Ratio (M‐H, Random, 95% CI)

0.46 [0.33, 0.63]

1.11 Major bleeding‐ Main analysis Show forest plot

18

9592

Risk Ratio (M‐H, Random, 95% CI)

1.30 [0.94, 1.79]

1.12 Major bleeding‐ Subgroups Lung vs non‐Lung Cancer Show forest plot

10

4163

Risk Ratio (M‐H, Random, 95% CI)

1.62 [1.02, 2.56]

1.12.1 Lung Cancer (SCLC or NSCLC)

5

3035

Risk Ratio (M‐H, Random, 95% CI)

1.45 [0.77, 2.73]

1.12.2 Non‐lung cancer

5

1128

Risk Ratio (M‐H, Random, 95% CI)

1.84 [0.94, 3.58]

1.13 Minor bleeding Show forest plot

16

9245

Risk Ratio (M‐H, Random, 95% CI)

1.70 [1.13, 2.55]

1.14 Thrombocytopenia Show forest plot

12

5832

Risk Ratio (M‐H, Random, 95% CI)

0.69 [0.37, 1.27]

Figuras y tablas -
Comparison 1. Heparin versus placebo