Consultation With a Medical Oncologist Before Surgery and Type of Surgery Among Elderly Women With Early-Stage Breast Cancer

Prior studies have documented variation in breast cancer treatment and care that does not follow guideline recommendations, particularly for elderly women. We assessed whether consultation with a medical oncologist before surgery was associated with use of definitive surgery, axillary node dissection, and type of surgery. We conducted a retrospective cohort study of a population-based sample of 9,630 women aged > or = 66 years diagnosed with breast cancer during 1995 to 1996. We measured the adjusted proportion visiting a medical oncologist before surgery, identified factors associated with such visits, and assessed the association between visits with a medical oncologist and use of definitive surgery (mastectomy or breast-conserving surgery with radiation v breast-conserving surgery without radiation); axillary dissection; and breast-conserving surgery versus mastectomy among women undergoing definitive surgery. Nineteen percent of women visited a medical oncologist before surgery; these women were younger, more often had larger or more poorly differentiated cancers, had more comorbid illnesses, and were treated more often at a teaching hospital (all P