LY450139 an be metabolised to 1,2 D 3 by 1-α-hydroxylase in benign and malignant breast tissue . Data in epidemiologic studies are inconsistent regarding a possible association between vitamin D levels and breast cancer risk. Some data suggest an association between plasma levels of vitamin D and breast cancer incidence . Our data show significantly lower 2 D 3 plasma levels in breast cancer patients older than 45 years during the wintertime. This difference was not detected in women under 45 years of age an also not when serum levels were diagnosed during summer. As COX-2 is responsible for the conversion of arachidonic acid into PGE 2 , our aim was to compare the serum levels of PGE 2 from breast cancer patients with healthy individuals.
Interestingly, we found the serum levels of PGE 2 increased while 2 D 3 was decreased in Xanthone breast cancer patients compared to healthy women. Because of this inverse To date, there have also been several epidemiologic studies about the association between vitamin D and ovarian cancer risk . In two recently published studies, Tworoger et al. and Toriola et al. observed no clear associations of serum vitamin D levels and ovarian cancer risk . However, Tworoger et al. found an association of serum vitamin D levels and ovarian cancer risk only in the subgroup of serous carcinoma of obese women. Our investigation did not show any association, neither in summernor in wintertime, but we did not find significantly serum levels of PGE 2 in the tumor patients, but only in the subgroup of patients older than 45 years and only during wintertime; but the mechanism and reason purchase SB 216763 remain unclear. COX inhibitors suppress cancer cell growth both in vivo and in vitro .
The possibility of a synergistic effect in combination with calcitriol and NSAIDs for cancer treatment should be considered but needs further investigation. Based on the elevated synthesis of PGs in cells that express COX-2, aromatase expression and activity appears to be increased in breast cells. This leads to an elevation of estrogens which might induce steroid hormone receptor expression. In order to test this theory, several studies order Finibax investigated the benefit of selective and non-selective COX-2 inhibitors in combination with endocrine therapy . Encouraging results for the adoption of calcitriol in combination with docetaxel were reported for prostate cancer in 8 . But recent results from Scher et al. investigating this combination of docetaxel and calcitriol in prostate cancer therapy did not present an expected benefit and led to a discontinuation of the treatment arm due to a shorter patient survival .
Further investigations are clearly required to establish the use of NSAIDs. In summary an inverse correlation of VDR and COX-2 and 15-PGDH expression was shown in our wavelength results. This suggests a possible link between VDR , associated target genes and PG metabolism in both ovarian and breast cancer. These findings are consistent with previously published data for breast cancer.