[Early phase II dose-finding study of exemestane in postmenopausal patients with advanced/recurrent breast cancer].

Exemestane was administered orally to postmenopausal women with advanced/recurrent breast cancer at a dose of 10 mg/day or 25 mg/day once daily for more than 8 weeks in order to evaluate the drug's anti-tumor effects and safety in a dose-finding study. The response rate (CR + PR) in the 10 mg and 25 mg group was 25.0% (8/32) and 31.4% (11/35), respectively, demonstrating no significant differences between the two groups, yet a higher efficacy rate was observed in 25 mg group. The efficacy rate in hormone-treatment-resistant patients within the 10 mg and 25 mg groups was 14.3% (3/21) and 26.1% (6/23), respectively, demonstrating more than a 20% response rate in 25 mg group. Incidences of the adverse events of which relevance to the drug could not be excluded were 30.6% (11/36) in the 10 mg group. 13.9% (5/36) in the 25 mg group and 22.2% (16/72) in the total group. The major adverse events were, hot flashes, numbness of the limbs, nausea, headache etc. Abnormal findings in clinical laboratory tests were as follows: ALP increase; GOT increase; GPT increase; gamma-GTP increase; total cholesterol increase; urinary sediment present. Abnormal findings in endocrine function were as follows: aldosterone decrease; testosterone.cortisol.DHEA-S decrease. But discontinuation due to abnormal laboratory findings was not found. No abnormal findings in physical tests were observed. A significant decrease in plasma estrogen concentration at week 4 was observed in both the 10 mg and 25 mg groups compared with baseline. These low levels were maintained throughout the study period. On the basis of these results, the efficacy of exemestane 25 mg/day was verified to be slightly higher than 10 mg/day. In addition the safety profile had no major adverse events to notice. In these patients with advanced/recurrent breast cancer, 25 mg/day was recommended as the most appropriate dose to be used clinically.

uPA receptor expression in benign and malignant thyroid tumors.

BACKGROUND: Urokinase type plasminogen activator receptor (uPAR) plays an important role in cancer invasion and metastasis. However, the uPAR expression has been rarely investigated in thyroid carcinomas. The aim of this study was to evaluate the clinical relevance of uPAR in thyroid tumors. MATERIALS AND METHODS: Samples included 53 benign tumors (follicular adenoma 34, Graves' disease 8, adenomatous goiter 7 and others 4) and 62 cancers (papillary thyroid cancer (PTC) 47, follicular TC (FTC) 5, medullary TC (MTC) 5 and anaplastic TC (ATC) 5). uPAR expression was prospectively investigated with a labeled streptavidin-biotin method using an anti-uPAR monoclonal antibody. Patients were classified into a low- and high-staining group according to the percentage of positive cells (cut-off value=10%). RESULTS: uPAR was more strongly expressed in thyroid cancers (35.5%) than benign tumors (7.5%). FTC had a significantly higher uPAR expression compared to follicular adenoma (p<0.01). The positivity of uPAR was as follows: PTC 36.2%, FTC 60%, MTC 0% and ATC 40%. In PTC, high uPAR expression was associated with poorly-differentiated PTC (p<0.01) while had a trend to develop more distant metastases than those with low uPAR expression (p=0.17, by the Kaplan-Meier method). CONCLUSION: This study has shown that uPAR expression might be useful for the discrimination between FTC and follicular adenoma and could possibly be used as a prognostic factor in PTC.