title: [Correlation of serum calcium level with tumor size and stage of renal cell carcinoma].
abstract: OBJECTIVE
  To analyze the correlation between serum calcium level and tumor size/ stage in patients with renal cell carcinoma (RCC).
  
  
  METHODS
  Totally 173 RCC cases were divided into 3 groups according to their serum calcium level, namely low, normal and high level groups. SPSS10.0 software was used for statistical analysis of the tumor sizes/stages and their association with serum calcium level in the 3 groups.
  
  
  CONCLUSIONS
  Kruskal-Wallis H test revealed no significant difference in the tumor size between the 3 groups (X(2)=4.768, df=2, P=0.092), but Spearman correlation analysis suggested inverse correlation between serum calcium and tumor size (r=-0.166, P=0.029). Kruskal-Wallis H test also failed to suggest significant difference in the tumor stage between the 3 groups (X(2)=4.277, df=2, P=0.118), but serum calcium was found to be inversely correlated with the tumor stage (r=-0.157, P=0.039 by Spearman correlation analysis).
authors.affiliation: Department of Urinary Surgery, Southern Medical University, Guangzhou 510515, China.
authors.forename: Han
authors.initials: H
authors.lastname: Bai
authors.forename: Shao-bin
authors.initials: SB
authors.lastname: Zheng
authors.forename: Jing
authors.initials: J
authors.lastname: Wu
authors.forename: De-zhong
authors.initials: DZ
authors.lastname: Liu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002118:Calcium / Q000097:blood*; D002292:Carcinoma, Renal Cell / Q000097:blood* / Q000473:pathology*; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000097:blood* / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging
chemical_list: D002118:Calcium