Treatment of lymph-node-negative, oestrogen-receptor-positive breast cancer: long-term findings from National Surgical Adjuvant Breast and Bowel Project randomised clinical trials.
BACKGROUND
Findings from the National Surgical Adjuvant Breast and Bowel Project B-14 and B-20 trials showed that tamoxifen benefited women with oestrogen-receptor-positive tumours and negative axillary nodes, and that chemotherapy plus tamoxifen was more effective than tamoxifen alone. We present long-term findings from those trials and relate them to age, menopausal status, and tumour oestrogen-receptor concentrations. We also discuss the extent of progress made in the treatment of such patients.


METHODS
B-14 patients were randomly assigned to placebo (n=1453) or tamoxifen (n=1439); B-20 patients to tamoxifen (n=788) or cyclophosphamide, methotrexate, fluorouracil, and tamoxifen (CMFT, n=789). Primary endpoints were recurrence-free survival and overall survival estimated according to patients' age, menopausal status, and tumour oestrogen-receptor concentration. Smoothed recurrence rates were used to measure patterns of recurrence as a continuous function of age.


RESULTS
Compared with placebo, tamoxifen benefited women in B-14 through 15 years, irrespective of age, menopausal status, or tumour oestrogen-receptor concentration (hazard ratio [HR] for recurrence-free survival 0.58, 95% CI 0.50-0.67, p<0.0001; HR for overall survival 0.80, 0.71-0.91, p=0.0008). In B-20, the benefit from CMFT over 12 years was greater than that from tamoxifen alone (HR for recurrence-free survival 0.52, 0.39-0.68, p<0.0001; HR for overall survival 0.78, 0.60-1.01, p=0.063). When CMFT was compared with placebo, there were reductions in treatment failure of about 65% in all age-groups.


CONCLUSIONS
Much benefit has been achieved in treatment of women with oestrogen-receptor-positive tumours and negative nodes. When planning systemic therapy for such patients of all ages, it should be understood that some have tumours with variable concentrations of oestrogen-receptors, a surrogate for other biomarkers associated with tumour growth and response to treatment. Older women tend to have higher tumour oestrogen-receptor concentrations and are more likely to benefit from tamoxifen than from chemotherapy; in younger women, the converse is true. Consequently, the notion that use of tamoxifen or chemotherapy should be based only on age is too restrictive.
Fisher
Bernard
B
Operations Center, National Surgical Adjuvant Breast and Bowel Project, Pittsburgh, PA, USA. bernard.fisher@nsabp.org
Jeong
Jong-Hyeon
JH
Bryant
John
J
Anderson
Stewart
S
Dignam
James
J
Fisher
Edwin R
ER
Wolmark
Norman
N
D000368:Aged; D018931:Antineoplastic Agents, Hormonal / Q000627:therapeutic use*; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000401:mortality / Q000473:pathology; D018572:Disease-Free Survival; D004311:Double-Blind Method; D004965:Estrogen Antagonists / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008207:Lymphatic Metastasis; D008875:Middle Aged; D011960:Receptors, Estrogen / Q000378:metabolism*; D012008:Recurrence; D015996:Survival Rate; D013629:Tamoxifen / Q000627:therapeutic use*
D018931:Antineoplastic Agents, Hormonal; D004965:Estrogen Antagonists; D011960:Receptors, Estrogen; D013629:Tamoxifen