Review of local soft tissue recurrence of breast cancer irradiated with and without actinomycin-D. A trial of human alpha interferon as an adjuvant agent in breast cancer after loco-regional recurrence. Adjuvant therapy after excision and radiation of isolated postmastectomy locoregional breast cancer recurrence: definitive results of a phase III randomized trial (SAKK 23/82) comparing tamoxifen with observation. First isolated locoregional recurrence following mastectomy for breast cancer: results of a phase III multicenter study comparing systemic treatment with observation after excision and radiation. Swiss Group for Clinical Cancer Research.
Between 1962 and 1973, regionally recurrent breast cancer was treated in 156 patients by irradiation alone or irradiation with concurrent actinomycin-D. Thirty-two patients were entered into a randomized trial, and 124 patients were retrospectively reviewed. Local control with irradiation alone was achieved in 48 of 80 patients (60%) and in 60 of 76 patients (79%) treated with irradiation and actinomycin-D (p less than .05). Results were remarkably similar in the randomized and retrospective series. Thirty-two women who had developed loco-regional recurrence of breast carcinoma were entered into a controlled trial of adjuvant alpha-interferon. All patients had histological confirmation of recurrence, local treatment with radiotherapy and negative staging investigations. They were then randomized to either observation alone, or treatment with human alpha interferon 3 x 10(6) units subcutaneously daily for 1 year. There were no differences detected in the rate of local or distant relapse. With this lack of clinically significant efficacy and a high incidence of side effects, it is concluded that alpha interferon is of doubtful value in the adjuvant treatment of breast cancer. Adjuvant systemic treatment for patients with isolated locoregional recurrence (ILRR) of breast cancer is based on a single reported randomized trial. The trial, conducted by the Swiss Group for Clinical Cancer Research, compared tamoxifen (TAM) with observation after complete excision of the ILRR and proper radiotherapy. We performed a definitive analysis of treatment outcome at >11 years of follow-up, after the majority of the patients had a subsequent event of interest. Patient and methods One hundred and sixty-seven patients with 'good-risk' characteristics of disease were randomized. 'Good-risk' was defined as estrogen receptor expression in the ILRR, or having a disease-free interval of >12 months and a recurrence consisting of three or less tumor nodules, each </=3 cm in diameter. Seventy-nine percent of the patients were postmenopausal at randomization.
                The median follow-up time of the surviving patients was 11.6 years. The median post ILRR disease-free survival (DFS) was 6.5 years with TAM and 2.7 years with observation (P = 0.053). The difference was mainly due to reduction of further local relapses (P = 0.011). In postmenopausal patients, TAM led to an increase of DFS from 33% to 61% (P = 0.006). In premenopausal women, 5-year DFS was 60%, independent of TAM medication. For the whole study population, the median post-recurrence overall survival (OS) was 11.2 and 11.5 years in the observation and the TAM group, respectively; premenopausal patients experienced a 5-year OS of 90% for observation compared with 67% for TAM (P = 0.175), while the respective figures for postmenopausal patients were both 75%.
                These definitive results confirmed that TAM significantly improves the post-recurrence DFS of patients after local treatment for ILRR. This beneficial effect does not translate into a detectable OS advantage. We performed a randomized phase III multicenter study to compare systemic treatment versus no treatment after complete excision and radiotherapy for isolated first locoregional recurrence in patients with breast cancer.
                One hundred sixty-seven good-risk patients with an estrogen receptor (ER+) positive recurrence or, in case of unknown receptor status, a disease-free interval (DFI) of greater than 12 months and < or = three recurrent tumor nodules each < or = 3 cm in diameter were entered onto the study. They were randomized to observation subsequent to local treatment or to receive tamoxifen (TAM) until disease progression. Seventy-nine percent of the patients were postmenopausal.
                The median observation period for the entire study population was 6.3 years. The median disease-free survival (DFS) duration was 26 months for observation and 82 months for TAM patients (P = .007). This was mainly due to the reduction of further local recurrences, whereas the occurrence of early distant metastases was delayed. A multivariate analysis identified DFI and treatment with TAM as significant prognostic factors for DFS. The 5-year overall survival (OS) rates were 76% and 74%, respectively (P = .77). DFI was also a prognostic factor for OS.
                Systemic therapy with TAM after isolated locoregional recurrence of breast cancer significantly increased 5-year DFS rates from 36% to 59% compared with observation alone and prolonged median DFS by more than 4.5 years in patients with ER+ tumors or in the case of unknown ER status with a DFI of greater than 12 months and minimal tumor burden. Treatment with TAM currently has no significant impact on OS, but the median survival duration of the study population has not yet been reached.
This systematic review of randomised trials provides insufficient evidence to support systemic treatment in women with loco-regional recurrence of breast cancer. Participation in randomised trials of systemic treatment versus observation is appropriate.