Abstract
This study explored the relationships of serum insulin-like growth factors, IGF-I and IGF-II, and their binding proteins (IGFBP)-2 and IGFBP-3, with key clinicopathological parameters in 92 patients with colorectal cancer (cases). Comparisons were made with 57 individuals who had a normal colonoscopy (controls). Serial changes were examined in 27 cases. As IGF-related peptides are age- and sex-dependent, absolute concentrations were converted to standard deviation scores (SDS). Mean IGF-II SDS were elevated in Dukes A (n= 12 P< 0.001) and Dukes B (n= 25 P< 0.001) cases compared with controls, but not in advanced disease. Compared with controls, mean IGFBP-2 SDS were significantly elevated in patients with Dukes B (P< 0.001), Dukes C (n= 13 P< 0.001) and advanced disease (n= 42 P< 0.0001), with a significant trend from early to advanced disease (one-way ANOVA P< 0.001). Furthermore, IGFBP-2 SDS were positively related to tumour size (P= 0.01) and fell significantly in patients following curative resection (P= 0.04), suggesting that circulating levels reflect tumour load. We tested the potential tumour marker characteristics of IGFBP-2 SDS against three endpoints: metastasis alone; local pelvic recurrence alone; and metastasis and recurrence combined. The sensitivities for IGFBP-2 alone (≥ + 2SD) were modest at 55%, 46%, and 52%, but in combination with CEA, increased substantially to 90%, 77% and 86%, respectively. We conclude that the serum IGF-II and IGFBP-2 profiles may provide insights into underlying biological mechanisms, and that serum IGFBP-2 may have an adjunct role in cancer surveillance in patients with colorectal cancer. © 2000 Cancer Research Campaign
Keywords: IGF-II, binding proteins, colorectal cancer
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