Objective: To investigate the serum calcium level in 86 patients with newly diagnosed multiple myeloma (MM) and its correlation with clinical features.
Methods: The clinical data of 86 patients with newly diagnosed multiple myeloma in our hospital from 2009 to 2016 were retrospectively analyed. Clinical data of sex, age, hemoglobin, albumin, globulin, creatinine, uric acid, serum phosphorus, β2-microglobulin, immunophenotyping and disease staging were collected. After the serum calcium level was corrected, the patients were grouped into low serum calcium (<2.20 mmol/L), normal serum calcium (2.20-2.60 mmol/L) and high serum calcium (>2.60 mmol/L). The correlation between the clinical characteristics and the serum calcium level was analysed, the clinical characteristics between the low and non-low calcium group were compared.
Results: The number of cases in low, normal and high serum cnlcium groups before correction was 58 (67.4%), 18 (20.9%) and 10 (11.6%) respactively, while the number of cases in 3 group after correction was 34 (39.5%), 36 (41.9%) and 16 (18.6%) respectively. The age, globulin, creatinine, uric acid and serum phosphorus levels were positively correlated with serum calcium level in patients with multiple myeloma, while the sex, hemoglobin,albumin and β2-microglobulin levels did not correlated with serum calcium level. There was significant difference in the age, globulin, creatinine and serum phosphorus between low calcium and non-low calcium group (P<0.05). However the differences of sex, hemoglobin, albumin, uric acid, β2-microglobulin, immunophenotyping and clinical stage were not statistically significant (P>0.05).
Conclusion: Multiple myeloma patients suffered from both hypercalcemia and hypocalcemia, and the incidence of hypocalcemia is not low. The levels of serum calcium in patients with multiple myeloma correlate with age, globulin, creatinine, uric acid, serum phosphorus level and other factors, thus it is necessary to correct the level of ionized calcium with physiological activity.
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