#21 Background In the last decade, use of adjuvant hormonal treatment increased as well as its duration. Aromatase inhibitors are associated with a minimal increase of disease free survival compared to tamoxifen. Both therapies are associated with different side effects which can affect quality of life (QoL). Therefore, it is necessary to compare the QoL of patients using these therapies. We compared the QoL of women participating in the Dutch Tamoxifen Exemestane Adjuvant Multicentre (TEAM) Trial.
 Patients and Methods The Dutch TEAM trial included 2754 postmenopausal early breast cancer patients who were randomised between five years of exemestane or 2.5-3 years of tamoxifen followed by 2.5-2 years of exemestane. A total of 742 patients were invited onto the QoL subprotocol. At one (T1) and two (T2) years after start of hormonal treatment, patients were ask to fill in questionnaires. This questionnaire contains the European Organisation for Research and Treatment of Cancer (EORTC) QLQ C30 and the EORTC BR23 questionnaires, supplemented with Functional Assessment of Cancer Therapy - Endocrine Subscale (FACT-ES) questions covering endocrine symptoms. The endpoint was the difference in QoL between patients receiving tamoxifen or exemestane.
 Results Questionnaires were completed by 543 patients at T1 and 83% of these returned the questionnaire of T2. There were no significant differences in physical functioning, role functioning, cognitive functioning, emotional functioning, body image, breast symptoms, arm symptoms and endocrine symptoms between both treatment groups at T1 nor at T2. Patients receiving exemestane had significantly less sexual enjoyment (difference of 9 points on a 0-100 scale; p=0.004) and more insomnia (difference of 8 points; p=0.005) compared to patients receiving tamoxifen at T1. At T2, there was no statistically significant difference in sexual enjoyment (difference of 4 points; p=0.287). However, patients receiving exemestane reported significantly worse sexual functioning (difference of 5 points; p=0.020) and still more insomnia (difference of 8 points; p=0.004).
 Conclusion Patients using exemestane reported less sexual enjoyment and more sexual functional problems than patients using tamoxifen. This may be explained by the fact that specific side effects of exemestane (e.g. vaginal dryness) can cause less sexual enjoyment which can result in a decreased sexual functioning. Citation Information: Cancer Res 2009;69(2 Suppl):Abstract nr 21.