Local recurrence after mastectomy and adjuvant CMF: implications for adjuvant radiation therapy.
BACKGROUND
The purpose of the present study was to evaluate the patterns of failure in a series of patients with node-positive breast cancer that was treated by total mastectomy and adjuvant chemotherapy.


METHODS
A retrospective review was undertaken of 217 patients with node-positive breast cancer who were referred to the oncology departments of Westmead and Nepean Hospitals following total mastectomy between January 1980 and December 1991. The majority of patients (82%) were pre- or peri-menopausal and all underwent chemotherapy with cyclophosphamide, methotrexate and 5-fluorouracil (CMF) by either an oral or intravenous regimen. No patient received adjuvant radiation therapy.


RESULTS
After a median follow up of 8.7 years, 19% of patients had developed a loco-regional recurrence (LRR). The majority of LRR (79%) occurred within the initial 3 years after mastectomy. The risk of LRR was positively associated with the size of the tumour (11% for T1 vs 53% for T3, P < 0.001) and axillary nodal status (16% for three or fewer positive nodes vs 31% for four or more positive nodes, P = 0.017). Patients with T1 or T2 tumours and 1-3 positive nodes had the lowest rate of LRR (11%) while those with T3 tumours or 4-10 positive nodes had the highest rates, ranging from 23 to 75%. Relapse at the chest wall and supraclavicular fossa (SCF) accounted for 46 and 35%, respectively, of all LRR; relapse at the internal mammary chain and axilla was uncommon.


CONCLUSIONS
The data suggest that patients with T3 tumours (> 5 cm) and any nodal involvement or patients with four or more involved axillary nodes, regardless of T stage, are at a high risk of LRR and will benefit from adjuvant radiation therapy to the chest wall and SCF.
Rangan
A M
AM
New South Wales Breast Cancer Institute, University of Sydney, Westmead, Australia.
Ahern
V
V
Yip
D
D
Boyages
J
J
D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage*; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000473:pathology / Q000601:surgery*; D017024:Chemotherapy, Adjuvant; D003131:Combined Modality Therapy; D003520:Cyclophosphamide / Q000008:administration & dosage; D005260:Female; D005472:Fluorouracil / Q000008:administration & dosage; D005500:Follow-Up Studies; D006801:Humans; D015409:Mastectomy, Radical; D008727:Methotrexate / Q000008:administration & dosage; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000401:mortality / Q000473:pathology* / Q000532:radiotherapy*; D018714:Radiotherapy, Adjuvant; D012189:Retrospective Studies; D015996:Survival Rate; D016896:Treatment Outcome
D003520:Cyclophosphamide; D005472:Fluorouracil; D008727:Methotrexate