Fig. 1

Serum calcium values and distribution of breast cancer cases by disease severity. a Representative box plots of the multiple serum calcium values from control and breast cancer cases. Each box plot represents the median and the Range (lower or 25th percentile and upper or 75th percentile) of the multiple circulating calcium concentrations from a single control subject (green) or a single breast cancer case (red). b and c Distribution of breast cancer cases according to tumor grades (b) and clinical stage (c)