Breast-conserving therapy for early-stage breast cancer.

In most other organs (extremities, bladder, rectum, larynx, or eye), the acceptance of organ-conserving therapy into standard oncologic practice has required only the demonstration of feasibility and efficacy--not equivalency with the radical surgical alternative. BCT was not generally accepted as standard oncologic practice until the maturation of numerous prospective randomized trials that universally demonstrated equivalence in disease control outcomes and survival with mastectomy. In fact, the acceptance of BCT as standard therapy in many parts of the United States actually lagged more than a decade behind sentinel publications documenting proof of equivalency with mastectomy. Even today, investigators continue to search for a subset of breast cancer patients who will have better disease control with radical surgery. BCT stands as not only the best-studied example of organ-conserving therapy but one of the most rigorously tested therapies in all of medicine. Breast-conserving therapy requires a multidisciplinary approach with close coordination among team members from diagnosis through surveillance following treatment. The surgeon must be willing to assess and re-excise margins, to mark the tumor bed with clips, and to use sentinel node biopsy in appropriate patients. The radiation oncologist must be willing to use CT planning, paying close attention not only to coverage of target tissues but to avoidance of critical normal tissues. The medical oncologist must work closely with the surgeon and radiation oncologist to determine the optimal sequencing of therapies and selection of systemic agents. All must recognize special circumstances where genetic counselling may be beneficial, psychosocial support may be needed, or BCT may not be the best choice for patients. When used appropriately, BCT produces maximal disease control and quality of life while minimizing iatrogenic functional, cosmetic, and psychologic sequelae in patients with early-stage breast cancer. BCT serves as a model for the optimal combination of surgery and radiation in organ-preserving cancer therapy.