Reanalysis and results after 12 years of follow-up in a randomized clinical trial comparing total mastectomy with lumpectomy with or without irradiation in the treatment of XXXX .

@entity1 @entity5 @entity0
BACKGROUND: Previous findings from a clinical trial (Protocol B-06) conducted by the National Surgical Adjuvant Breast and Bowel Project (NSABP) indicated the worth of lumpectomy and breast irradiation for treating @entity0 . After the discovery by NSABP staff members of falsified information on @entity1 enrolled in the study by St. Luc Hospital in Montreal, separate audits were conducted at St. Luc Hospital and other participating institutions. We report the results of both audits and update the study findings through an average of 12 years of follow-up. METHODS: @entity1 with either negative or positive axillary nodes and @entity5 4 cm or less in diameter were randomly assigned to one of three treatments: total mastectomy, lumpectomy followed by breast irradiation, or lumpectomy without irradiation. Three cohorts of @entity1 were analyzed. The first cohort included all 2105 randomized @entity1 , who were analyzed according to the intention-to-treat principle. The second cohort consisted of 1851 eligible @entity1 in the first cohort with known nodal status who agreed to be followed and who accepted their assigned therapy (among those excluded were 6 @entity1 from St. Luc Hospital who were declared ineligible because of falsified biopsy dates). The third cohort consisted of the @entity1 in the second cohort minus the 322 eligible @entity1 from St. Luc Hospital (total, 1529 @entity1 ). RESULTS: Regardless of the cohort, no significant differences were found in overall survival, disease-free survival, or survival free of disease at distant sites between the @entity1 who underwent total mastectomy and those treated by lumpectomy alone or by lumpectomy plus breast irradiation. After 12 years of follow-up, the cumulative incidence of a recurrence of @entity5 in the ipsilateral breast was 35 percent in the group treated with lumpectomy alone and 10 percent in the group treated with lumpectomy and breast irradiation (P < 0.001). CONCLUSIONS: Our findings continue to indicate that lumpectomy followed by breast irradiation is appropriate therapy for @entity1 with either negative or positive axillary nodes and @entity0 4 cm or less in diameter.
