Survival is Better After Breast Conserving Therapy than Mastectomy for Early Stage Breast Cancer: A Registry-Based Follow-up Study of Norwegian Women Primary Operated Between 1998 and 2008.
BACKGROUND
Breast-conserving therapy (BCT) and mastectomy (MTX) has been considered to have a similar long-time survival. However, better survival in women undergoing BCT compared with MTX is found in two recent register studies from the United States. The purpose of this study was to compare survival after BCT and MTX for women with early-stage breast cancer in Norway.


METHODS
Women with invasive, early-stage breast cancer (1998-2008) where BCT and MTX were considered as equally beneficial treatments were included for a total of 13,015 women. Surgery was divided in two main cohorts (primary BCT, primary MTX) and five subcohorts. Analyses were stratified into T1N0M0, T2N0M0, T1N1M0, T2N1M0, and age groups (<50, 50-69, ≥70). Overall survival and breast cancer-specific survival (BCSS) were calculated in life tables, hazard ratios by Cox regression, and sensitivity analyses.


RESULTS
Five-year BCSS for women who underwent primary BCT or primary MTX was 97 and 88 %, respectively. Women who underwent primary MTX had a hazard ratio of 1.64 (95 % confidence interval 1.43-1.88) for breast cancer death compared with women who underwent primary BCT after adjusting for the year of diagnosis, age at diagnosis, stage, histology, and grade.


CONCLUSIONS
Survival was better or equal after breast-conserving therapy than mastectomy in all early stages, surgical subcohorts, and age groups. This advantage could not only be attributed to differences in tumor biology.
Cancer Registry of Norway, Oslo, Norway. olafjhj@online.no.|Department of Breast and Endocrine Surgery, Oslo University Hospital, Oslo, Norway. olafjhj@online.no.
Olaf Johan
OJ
Hartmann-Johnsen
University of Oslo, Oslo, Norway.|, Nesøya, Norway.
Rolf
R
Kåresen
Department of Breast and Endocrine Surgery, Oslo University Hospital, Oslo, Norway.
Ellen
E
Schlichting
Cancer Registry of Norway, Oslo, Norway.|University of Oslo, Oslo, Norway.
Jan F
JF
Nygård
D000368:Aged; D000369:Aged, 80 and over; D001943:Breast Neoplasms / Q000401:mortality / Q000473:pathology* / Q000628:therapy*; D018270:Carcinoma, Ductal, Breast / Q000401:mortality / Q000556:secondary / Q000628:therapy*; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008207:Lymphatic Metastasis; D008408:Mastectomy; D015412:Mastectomy, Segmental; D008875:Middle Aged; D060787:Neoplasm Grading; D009367:Neoplasm Staging; D009664:Norway; D016016:Proportional Hazards Models; D018714:Radiotherapy, Adjuvant; D012042:Registries; D012086:Reoperation; D015996:Survival Rate