The sentinel lymph node biopsy (SLNB) represents a minimal invasive surgical method for axillary staging in patients with primary breast cancer. In a prospective study, evaluation of quality of life (QOL) and arm morbidity was performed before surgery on a total of 56 breast cancer patients. The EORTC QLQ-C30 and EORTC QLQ-BR23 questionnaires were used for QOL assessment. Assessment of pain was additionally observed using the McGill Pain Questionnaire. Arm mobility was observed by goniometric measurement of arm movement. Data were collected before surgery (t1), 1 week after discharge (t2) and 9 -12 months after surgery (t3). The type of axillary surgery does not seem to affect global QOL at a short-time follow-up, but patients recover sooner after SLNB. Body image and sexual functioning remain stable in both types of axillary surgery. Arm/shoulder pain was reported in 36% of patients after SLNB in comparison to 68% receiving axillary lymph node dissection (ALND), and 'numbness' was reported only in 4% of patients in the SLNB group vs 19.3% after ALND. Abduction, flexion and horizontal adduction of the affected arm show significant impairment after ALND. Breast cancer patients should be counselled about the benefits of SLNB over ALND concerning QOL and postsurgery side effects in a short-term follow-up. Axillary lymph node dissection (ALND) in breast cancer patients still represents the routine surgical method for axillary staging. Although the axillary node status is the most important prognostic factor for recurrence and survival (Fisher et al, 1984;Carter et al, 1989) and information obtained by axillary dissection is useful for planning adjuvant treatment, it is associated with substantial morbidity (Kissin et al, 1986;Ivens et al, 1992;Keramopoulos et al, 1993;Hack et al, 1999;Kakuda et al, 1999) and psychological distress (Maunsell et al, 1993;Tobin et al, 1993;Shimozuma et al, 1999). Hack et al, showed arm/shoulder pain, weakness or numbness in 72% and impaired range of motion in 73% of breast cancer patients after ALND, whereas high levels of quality of life (QOL) were reported. Moderate to severe pain was reported between 20, 23 and 32% (Van Dam et al, 1993;Kuehn et al, 2000;Ververs et al, 2001) and was not significantly related to time since surgery. Other reports suggest that arm problems after ALND are associated with a negative effect on the overall QOL of breast cancer patients (Maunsell et al, 1993;Kuehn et al, 2000). As a result of the need to reduce axillary morbidity, many investigations have been performed on sentinel lymph node biopsy (SLNB), an alternative procedure. Using vital dye and/or radiocolloid, the sentinel node/s as the first lymph node to receive lymphatic drainage from the primary tumour can be identified by a minimal invasive surgical technique. Recently, published data showed no sensory morbidity after SLNB (Giuliano et al, 2000) at a median follow-up of 39 months. Schrenk et al (2000) reported less postoperative arm pain, numbness and arm motion restriction after SLNB at a foll...