Children diagnosed with cancer face a significantly higher risk of vitamin D hypovitaminosis—a deficiency or insufficiency—compared to their non-oncology peers, according to a recent case-control study conducted at Al Zaharaa Hospital University Medical Center in Lebanon. The research, which analyzed 268 pediatric patients, found that 97% of children with cancer exhibited low vitamin D levels, compared to 79.6% among non-oncology participants.
The Link Between Pediatric Oncology and Vitamin D Deficiency
Among the 67 oncology patients, 80.6% were classified as vitamin D deficient (≤20 ng/mL), while 16.4% were classified as having insufficiency (21-29 ng/mL).
The researchers, citing the Endocrine Society guidelines, suggest that the disease process and the side effects of chemotherapy contribute to this vulnerability. Chemotherapy agents can lead to hepatotoxicity and nephrotoxicity, which may impair the body’s ability to convert vitamin D into its active forms. Furthermore, patients often avoid sunlight due to treatment-related photosensitivity, limiting the body’s natural vitamin D synthesis.
Age as a Predictor of Vitamin D Levels
The study identified age as a significant predictor of vitamin D status among pediatric oncology patients. Multiple linear regression analysis revealed that for every one-year increase in age, vitamin D levels among oncology patients with hypovitaminosis decreased by an average of 1.03 ng/mL.
This trend toward lower levels in older children may stem from shifting dietary habits and reduced outdoor activity as children transition into adolescence.
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Frequently Asked Questions
- Why are children with cancer at higher risk for vitamin D deficiency?
According to the study, factors include chemotherapy-induced organ toxicity affecting vitamin D metabolism, reduced sun exposure due to treatment, and the impact of the disease on vitamin D binding proteins. - What defines vitamin D deficiency according to this study?
The researchers utilized Endocrine Society recommendations, defining deficiency as 25(OH)D levels ≤20 ng/mL and insufficiency as 21-29 ng/mL. - Does the type of cancer affect vitamin D levels?
In this specific study, there was no statistically significant association between the type of cancer (solid tumors vs. hematological malignancies like leukemia or lymphoma) and the severity of vitamin D deficiency.
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