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Predictive modeling of hypophosphatasia based on a case series of adult patients with persistent hypophosphatasemia

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Abstract

Summary

Approximately half of individuals with hypophosphatasemia (low levels of serum alkaline phosphatase) have hypophosphatasia, a rare genetic disease in which patients may have stress fractures, bone and joint pain, or premature tooth loss. We developed a predictive model based on specific biomarkers of this disease to better diagnose this condition.

Introduction

Hypophosphatasemia is a condition in which low levels of alkaline phosphatase (ALP) are detected in the serum. Some individuals presenting with this condition may have a rare genetic disease called hypophosphatasia (HPP), which involves mineralization of the bone and teeth. Lack of awareness of HPP and its nonspecific symptoms make this genetic disease difficult to diagnose. We developed a predictive model based on biomarkers of HPP such as ALP and pyridoxal 5′-phosphate (PLP), because clinical manifestations sometimes are not recognized as symptoms of HPP.

Methods

We assessed 325,000 ALP results between 2010 and 2015 to identify individuals suspected of having HPP. We performed univariate and multivariate analyses to characterize the relationship between hypophosphatasemia and HPP. Using several machine learning algorithms, we developed several models based on biomarkers and compared their performance to determine the best model.

Results

The final cohort included 45 patients who underwent a genetic test. Half (23 patients) showed a mutation of the ALPL gene that encodes the tissue-nonspecific ALP enzyme. ALP (odds ratio [OR] 0.61, 95% confidence interval [CI] 0.3–0.8, p = 0.01) and PLP (OR 1.06, 95% CI 1.01–1.15, p = 0.04) were the only variables significantly associated with the presence of HPP. Support vector machines and logistic regression were the machine learning algorithms that provided the best predictive models in terms of classification (area under the curve 0.936 and 0.844, respectively).

Conclusions

Given the high probability of a misdiagnosis, its nonspecific symptoms, and a lack of awareness of serum ALP levels, it is difficult to make a clinical diagnosis of HPP. Predictive models based on biomarkers are necessary to achieve a proper diagnosis. Our proposed machine learning approaches achieved reasonable performance compared to traditional statistical methods used in biomedicine, increasing the likelihood of properly diagnosing such a rare disease as HPP.

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Data availability

According to the terms of a contract signed with Mostoles University Hospital, which provided the data set, we cannot provide our data set to any other researcher. Furthermore, we destroyed the data set at the conclusion of our investigation.

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Acknowledgments

The authors would like to thank Blanca San Jose Montano, the Health Science Librarian-Documentalist at our institution, for her great support, suggestions, and encouragement in the making of this manuscript.

Funding

The authors received no financial support for the research, authorship, and/or publication of this article.

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Correspondence to R. Garcia-Carretero.

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This retrospective research was approved by the Research and Ethics Committee of Mostoles University Hospital. All procedures involving human participants were conducted in accordance with the ethical standards of the responsible institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The authors obtained consent to publish from their own institution and its Research and Ethics Committee.

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Garcia-Carretero, R., Olid-Velilla, M., Perez-Torrella, D. et al. Predictive modeling of hypophosphatasia based on a case series of adult patients with persistent hypophosphatasemia. Osteoporos Int 32, 1815–1824 (2021). https://doi.org/10.1007/s00198-021-05885-8

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