|High plasma YKL-40 level in patients with ovarian cancer stage III is related to shorter survival|
Authors: Estrid V.S. Høgdall, Julia S. Johansen, Susanne K. Kjaer, Paul A. Price, Lise Christensen, Jan Blaakaer, Johannes E. Bock, Eva Glud, Claus K. Høgdall
Institute of Cancer Epidemiology, Danish Cancer Society, DK-2100 Copenhagen Ø, Denmark. firstname.lastname@example.org
YKL-40 (human cartilage glycoprotein-39) is a member of family 18 glycosyl hydrolases. YKL-40 is a growth factor and is secreted by cancer cells. High serum levels of YKL-40 in patients with colorectal cancer and recurrent metastatic breast cancer have been associated with a poor prognosis. We evaluated the prognostic value of plasma YKL-40 in patients with primary ovarian cancer (OC). YKL-40 was determined by ELISA in plasma obtained preoperatively from 47 women with stage III OC and in plasma from 79 healthy females. The results showed that plasma YKL-40 was elevated compared to healthy females in 57% of the OC patients and was highest in the patients who died during the follow-up compared to the patients still alive (186 vs. 78 µg/l, p=0.002). Patients with high plasma YKL-40 (>130 µg/l) had significantly (p=0.0003) shorter survival than patients with normal plasma YKL-40. Multivariate Cox regression analysis showed that plasma YKL-40 (RH=3.95; 95% CI, 1.52-10.27; p=0.005) and radicality after primary surgery (RH=4.03; 95% CI, 1.81-8.97; p=0.001) were independent prognostic factors of survival, whereas age, histological type of tumour and serum CA125 had no independent prognostic value. In conclusion, plasma levels of YKL-40 proved of prognostic value in stage III OC patients.