Abstract P3-01-02: Overview of the pathological results and treatment characteristics in the first 1000 patients randomized in the SERC trial: Axillary dissection versus no axillary dissection in patients with involved sentinel node

Background: Three randomized trials have concluded at non inferiority of omission of complementary axillary lymph node dissection (cALND) for patients with involved sentinel node (SN). However, we can outline strong limitations of these trials to validate this attitude with a high scientific level. We designed the SERC randomized trial to compare outcomes in patients with SN involvement treated with ALND or no further axillary treatment. The aim of this study was to analyze results of the first 1000 patients included.

Patients and Methods: SERC trial is a multicenter non-inferiority phase 3 trial. Multivariate logistic regression analysis was used to identify independent factors associated with adjuvant chemotherapy administration and non-sentinel node (NSN) involvement.

Results : Of the 963 patients included in the analysis set, 478 were randomized to receive cALND and 485 SLNB alone. All patient demographics and tumor characteristics were balanced between the two arms. SN ITC was present in 6.3% patients (57/903), micro metastases in 33.0% (298), macro metastases in 60.7% (548) and 289 (34.2%) were non eligible to Z0011 trial criteria.

Whole breast or chest wall irradiation was delivered in 95.9% (896/934) of patients, adjuvant chemotherapy in 69.5% (644/926), endocrine therapy in 89.6% (673/751) and the proportions were similar in the two arms. The overall rate of positive NSN was 19% (84/442) for patients with cALND. Crude rates of positive NSN according to SN status were 4.5% for ITC (1/22), 9.5% for micro metastases (13/137), 23.9% for macro metastases (61/255) and were respectively 29.36% (64/218), 9.33% (7/75) and 7.94% (10/126) when chemotherapy was administered after cALND, before cALND and for patients without chemotherapy.

Conclusion: The main objective of SERC trial is to demonstrate non inferiority of cALND omission. A strong interaction between timing of cALND and chemotherapy with positive NSN rate was observed.

Citation Format: Houvenaeghel G, Cohen M, Raro P, De Troyer J, Tunon De Lara C, Guimbergues P, Gauthier T, Faure C, Vaini-Cowen V, Lantheaume S, Regis C, Darai E, Ceccato V, D'Halluin G, Del Piano F, Villet R, Jouve E, Beedassy B, Theret P, Gabelle P, Zinzindohoue C, Opinel P, Marsollier-Ferrer C, Dhainaut-Speyer C, Colombo P-E, Di Beo V, Lambaudie E, Tallet A, Boher J-M. Overview of the pathological results and treatment characteristics in the first 1000 patients randomized in the SERC trial: Axillary dissection versus no axillary dissection in patients with involved sentinel node [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P3-01-02.

Prognostic factors in ductal carcinoma in situ of the breast: results of a retrospective study of 575 cases. The Association for Research in Oncologic Gynecology

OBJECTIVE

Conservative treatment for ductal carcinoma in situ of the breast exposes patients to the risk of infiltrating recurrence which can lead to metastasis. The primary purposes of this retrospective study were to evaluate diagnostic and therapeutic methods over a 10-year period and to validate prognostic factors. This information should greatly improve patient selection for conservative treatment or mastectomy.

STUDY DESIGN

A multi-institutional data base including 575 patients treated between 1983 and 1993 was established by combining data from 16 French institutions. Survival at 5 and 7 years was studied as a function of various prognostic factors.

RESULTS

Recurrence-free survival at 7 years was 0.96 after modified radical mastectomy and 0.83 after breast-conserving treatment and radiotherapy (P=0.003). Metastasis-free survival at 7 years was 0.99 after modified radical mastectomy and 0.94 after breast-conserving treatment and radiotherapy (not significant). No factor was predictive of local recurrence after mastectomy. Clinical stage was the only factor significantly correlated with metastasis after mastectomy. Recurrence-free survival after breast-conserving treatment with radiotherapy was significantly lower for patients with comedo carcinoma, multifocal lesions, or unclear resection margins, regardless of whether the histological type was comedo or non-comedo carcinoma. Metastasis-free survival was significantly lower for patients with multifocal lesions and for patients with unclear margins after excision of comedo carcinoma.

CONCLUSIONS

Breast-conserving treatment with radiotherapy is a valid alternative to mastectomy. Patients must be selected carefully on the basis of morphological criteria. Swift gains in therapeutic outcome can be obtained by stressing quality control at each stage of diagnosis and treatment.

Impact of menopausal hormone-replacement therapy on clinical and laboratory characteristics of breast cancer

Hormone-replacement therapy (HRT) is widely used by post-menopausal women. Although this treatment may slightly increase the incidence of breast cancer, more and more cases are diagnosed while women are taking HRT. The purpose of this study was to ascertain the influence of HRT on prognostic factors and outcome of breast cancer. Data on all breast-cancer patients, including precise information on HRT, was prospectively and systematically recorded in a data base. From 1985 to 1995, 1379 post-menopausal women fulfilled the eligibility criteria for this study. All were treated by us (P.B. and L.P.) in our ward of a large public hospital of Marseilles, France. The clinical features, laboratory findings and survival rates in 142 HRT users who developed breast cancer while being treated were compared with those of 284 matched never user breast-cancer patients. Patients who developed breast cancer during HRT had fewer locally advanced cancers and smaller and better-differentiated cancers. Lymph-node involvement was significantly less frequent in the user group than in the non-user group (non-significant). Estradiol receptivity was both qualitatively and quantitatively lower in users. There was no significant difference with regard to recurrence and metastasis-free survival and overall survival. We conclude that HRT does not affect the prognosis of breast cancer. Regular surveillance during HRT allows early detection of smaller lesions. The higher number of well-differentiated cancers and the distribution of hormone receptivity may reflect interaction between neoplastic tissue and exogenous hormones.

[Mouchel transmuscular incision: a closure variant]

Low transverse incision according to Mouchel is an interesting technique in Gynecology-Obstetrics. Two closure methods are generally used but both inevitably leave a dead-space in the subaponevrotic zone. A simple technical variation, which is rapid and easily reproducible, allows to overcome this inconvenience.

Inflammatory carcinomas of the breast: a clinical, pathological, or a clinical and pathological definition?

Some controversy remains about the clinical or pathological definition of the different types of inflammatory breast cancer (IBC) and especially the diagnostic and prognostic value of dermal lymphatic involvement. Our purpose was to classify the different types of IBC for which diagnosis was confirmed intraoperatively and ascertain features allowing reliable diagnosis. We studied clinical findings, biological data, and treatment outcome in a series of 144 successive patients. Our results suggest that there are 2 biologically different entities i.e., true IBC and pseudo-IBC. True IBC, whose course is currently fatal in all cases, can be divided into 2 sub-categories i.e., common true IBC (75.7% of cases), in which inflammatory signs occur primarily or secondarily, and occult true IBC (13.2% of cases). Dermal emboli have been observed in 61% of common true IBC, but their absence did not alter the rapidly unfavourable outcome. Extensive lymph-node involvement, other biological features and survival were the same in the 2 sub-categories. Pseudo-IBC (11.1% of cases) can easily be confused with common true IBC. The biological characteristics of pseudo-IBC differ from those of true IBC: no dermal lymphatic involvement and little or no lymph-node involvement. Despite large tumour size, outcome was particularly favourable. It is of great importance to differentiate true and pseudo-IBC, for which the treatments are different. Confirmation of true IBC requires pathological demonstration of dermal lymphatic emboli or extensive lymph-node involvement. Occult IBC must be identified for patients presenting rapidly growing tumours.