TY - JOUR
T1 - Thrombocytosis and abnormal liver enzymes
T2 - A trigger for investigation of underlying malignancy
AU - Gold, Lucy C.
AU - Macpherson, Iain
AU - Nobes, Jennifer H.
AU - Dow, Eleanor
AU - Furrie, Elizabeth
AU - Jamieson, Scott
AU - Dillon, John F.
N1 - Funding Information:
First author, LCG, received financial support from University of Dundee while undertaking the study as part of a Student Vacation Scholarship. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Ian Kennedy, Blood Sciences IT, Department of Blood Sciences, NHS Tayside, Ninewells Hospital & Medical School, Dundee, UK.
Publisher Copyright:
© 2022 Gold et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
PY - 2022/4/28
Y1 - 2022/4/28
N2 - Background: Thrombocytosis is often an incidental finding in primary care with a range of causes. Despite evidence of a strong association between thrombocytosis and malignancy, guidelines for investigating thrombocytosis in the absence of red flag symptoms remain unclear. A novel automated system of laboratory analysis, intelligent Liver Function Testing (iLFT), launched in Tayside in 2018 and has identified a patient group with thrombocytosis and abnormal liver test (LFT) results. This study analysed the outcome of these patients and investigated the use of thrombocytosis combined with LFTs in predicting risk of cancer.Methods and findings: Between August 2018 and August 2020, 6792 patients underwent iLFT, with 246 found to have both thrombocytosis and at least one abnormal LFT. A random case-matched control group of 492 iLFT patients with normal platelet count and at least one abnormal LFT was created. 7.7% (95% CI 4.7-11.8%) of patients with thrombocytosis had cancer compared to 2.0% (1.0-3.7%) of controls. Patients <40 years or with pre-existing causes of thrombocytosis were then excluded. Subsequent analysis revealed a 10.8% (6.6-16.3%) incidence of cancer in thrombocytosis patients (n = 176) compared to 2.5% (1.2-4.6%, p = 0.00014) in patients with normal platelet count (PLT) (n = 398). When thrombocytosis is combined with elevated alkaline phosphatase (ALP), there is a positive predictive value (PPV) of 20% for cancer. These rules were subsequently applied to a validation cohort of 71,652 patients, of whom 458 had thrombocytosis and elevated ALP. There was a 30.6% cancer incidence, confirming the strong predictive value of the combined test of PLT and ALP.Conclusions: These findings suggest a substantial increased risk of cancer in patients with thrombocytosis and raised ALP. This could be developed as an adjunct to current investigation algorithms, highlighting high-risk patients and prompting further investigation (such as computed tomography scans) where indicated.
AB - Background: Thrombocytosis is often an incidental finding in primary care with a range of causes. Despite evidence of a strong association between thrombocytosis and malignancy, guidelines for investigating thrombocytosis in the absence of red flag symptoms remain unclear. A novel automated system of laboratory analysis, intelligent Liver Function Testing (iLFT), launched in Tayside in 2018 and has identified a patient group with thrombocytosis and abnormal liver test (LFT) results. This study analysed the outcome of these patients and investigated the use of thrombocytosis combined with LFTs in predicting risk of cancer.Methods and findings: Between August 2018 and August 2020, 6792 patients underwent iLFT, with 246 found to have both thrombocytosis and at least one abnormal LFT. A random case-matched control group of 492 iLFT patients with normal platelet count and at least one abnormal LFT was created. 7.7% (95% CI 4.7-11.8%) of patients with thrombocytosis had cancer compared to 2.0% (1.0-3.7%) of controls. Patients <40 years or with pre-existing causes of thrombocytosis were then excluded. Subsequent analysis revealed a 10.8% (6.6-16.3%) incidence of cancer in thrombocytosis patients (n = 176) compared to 2.5% (1.2-4.6%, p = 0.00014) in patients with normal platelet count (PLT) (n = 398). When thrombocytosis is combined with elevated alkaline phosphatase (ALP), there is a positive predictive value (PPV) of 20% for cancer. These rules were subsequently applied to a validation cohort of 71,652 patients, of whom 458 had thrombocytosis and elevated ALP. There was a 30.6% cancer incidence, confirming the strong predictive value of the combined test of PLT and ALP.Conclusions: These findings suggest a substantial increased risk of cancer in patients with thrombocytosis and raised ALP. This could be developed as an adjunct to current investigation algorithms, highlighting high-risk patients and prompting further investigation (such as computed tomography scans) where indicated.
UR - http://www.scopus.com/inward/record.url?scp=85129269002&partnerID=8YFLogxK
U2 - 10.1371/journal.pone.0267124
DO - 10.1371/journal.pone.0267124
M3 - Article
C2 - 35482741
SN - 1932-6203
VL - 17
JO - PLoS ONE
JF - PLoS ONE
IS - 4
M1 - e0267124
ER -
