The prognostic role of tumor size in early breast cancer in the era of molecular biology.

BACKGROUND: The prognosis of early breast cancer (EBC) depends on patient and tumor characteristics. The association between tumor size, the largest diameter in TNM staging, and prognosis is well recognized. According to TNM, tumors classified as T2, could have very different volumes; e.g. a tumor of 2.1 cm has a volume of 4500 mm3, while a tumor of 4.9 cm has a volume of 60.000 mm3 even belonging to the same class. The aim of the study is to establish if the prognostic role of tumor size, expressed as diameter and volume, has been overshadowed by other factors. METHODS: The primary objective is to evaluate the association between tumor dimensions and overall survival (OS) / disease free survival (DFS), in our institution from January 1st 2005 to September 30th 2013 in a surgical T1-T2 population. Volume was evaluated with the measurement of three half-diameters of the tumor (a, b and c), and calculated using the following formula: 4/3π x a x b x c. RESULTS: 341 patients with T1-T2 EBC were included. 86.5% were treated with conservative surgery. 85.1% had a Luminal subtype, 9.1% were Triple negative and 7.4% were HER2 positive. Median volume was 942 mm3 (range 0.52-31.651.2). 44 patients (12.9%) relapsed and 23 patients died. With a median follow-up of 6.5 years, the univariate analysis for DFS showed an association between age, tumor size, volume, histological grading and molecular subtype. The multivariate analysis confirmed the statistically significant association only for molecular subtype (p 0.005), with a worse prognosis for Triple negative and HER2 positive subtypes compared with Luminal (HR: 2.65; 95%CI: 1.34-5.22). Likewise for OS, an association was shown by the multivariate analysis solely for molecular subtype (HER2 and Triple negative vs. Luminal. HR: 2.83; 95% CI:1.46-5.49; p 0.002). CONCLUSIONS: In our study, the only parameter that strongly influences survival is molecular subtype. These findings encourage clinicians to choose adjuvant treatment not based on dimensional criteria but on biological features.

Role of patient and tumor characteristics in sentinel lymph node metastasis in patients with luminal early breast cancer: an observational study.

Predicting the risk of sentinel lymph node (SLN) metastasis is important for clinical decision-making in the setting of early breast cancer (EBC). This study is aimed to identify tumor and patient characteristics that influenced the SLN metastatic involvement, with a focus on luminal subtypes. An observational study including women treated for EBC from 2005 to 2013 was conducted. Regression analyses were used to assess the association between SLN metastasis and age, menopausal status, tumor size, histological grading, presence of extensive "in situ" carcinoma components, lymphovascular invasion (LVI), and expression of Ki-67, hormone receptors, and HER2. Of 345 women, 84 (24.3 %) had at least one SLN metastasis; 63.1 % were macrometastases. Among all patients, 31.6 % exhibited LVI. In univariate analyses, tumor size, histological grade, and LVI were associated with SLN metastasis. The multivariate model confirmed only the association between LVI and SLN status (OR 3.27, 95 % CI 1.85-5.68; p < 0.0001). Luminal subtypes were detected in 86.1 % of women. In this subgroup, the multivariate model confirmed a significant relationship between LVI and SLN status (OR 3.47, 95 % CI 1.90-6.33; p < 0.0001). Since a proper histopathological assessment of LVI is not possible prior to surgery, this factor cannot be used to guide decisions on performing SLN biopsies. Nevertheless, when a SLN biopsy is refused or contraindicated, an LVI assessment on an excisional biopsy of the tumor could facilitate prognosis determination and treatment management.

Prospective, mono-institutional study of the impact of a systematic prevention program on incidence and outcome of osteonecrosis of the jaw in patients treated with bisphosphonates for bone metastases.

The aim of our study was to investigate the occurrence of osteonecrosis of the jaw (ONJ) after implementation of dental preventive measures before starting bisphosphonates (BPs) therapy and during treatment. All consecutive patients with bone lesions eligible for BPs treatment were prospectively evaluated. Before starting BPs, each patient underwent a strict dental preventive program with a specialized odontoiatric team. The odontoiatric evaluation identified patients with oral pathologies or inadequate oral hygiene and provided a dental preventive treatment. From April 2007 to April 2012, 254 patients were enrolled. After excluding patients due to previous BPs treatment, 212 patients with a mean age of 74 years (range 37-95) were included. On average, patients received 9.7 treatment cycles (range 1-48). No ONJ was recorded (0.0 %; 95 % confidence interval [CI] 0.0-1.4). Comparing this risk with that observed in a previous cohort who did not receive dental prevention (16/186, 8.6 %; 95 % CI 4.2-15.3 %), we observed clear efficacy in preventing ONJ (relative risk reduction: 100 %, 95 % CI 86-100 %, P < 0.0001). We developed a strict three-step prevention program that is able to decrease ONJ incidence and the need for destructive surgery with permanent sequelae. We demonstrated that ONJ could be effectively prevented. We recommend a mandatory preventive program involving a multidisciplinary team for all patients starting BPs.

Efficacy of trastuzumab in unselected patients with HER2-positive metastatic breast cancer: a retrospective analysis.

AIMS AND BACKGROUND: The addition of trastuzumab to chemotherapy for HER2-positive metastatic breast cancer has significantly improved progression-free survival and overall survival, although most patients develop resistance or have a primarily resistant disease. The aim of the study was to describe the efficacy and safety of a first-line treatment in unselected metastatic HER2-positive breast cancer patients, treated according to clinical practice. METHODS: From 2000 to 2009, we conducted a retrospective multi-institutional analysis of 182 consecutive patients with HER2-positive metastatic breast cancer who underwent first-line treatment with trastuzumab. The primary end points were progression-free survival and overall survival; the secondary end points were survival after progression in patients treated with second-line chemotherapy with or without trastuzumab and safety. A total of 172 patients were analyzed. RESULTS: Median progression-free survival and overall survival were 1.2 (95% CI, 1.1-1.4) and 4.4 years (95% CI, 3.6-5.4), respectively. For 100 patients who received second-line chemotherapy, median survival after progression was significantly longer in those who also received trastuzumab: 2.8 (95% CI, 2.1-4.0) versus 1.2 years (95% CI, 0.6-1.9). CONCLUSIONS: Although based on retrospective data, the study confirms the role of trastuzumab as first-line treatment in metastatic breast cancer outside of a controlled trial. Moreover, information obtained on the use of trastuzumab beyond disease progression supports its use in this setting.

Efficacy of biological agents in metastatic triple-negative breast cancer.

Metastatic triple-negative breast cancer (mTNBC) represents 15% of invasive breast cancers. Prognosis is poor, and there is no specific target therapy but biological agents combined with chemotherapy may be effective. To assess the role of biological agents in metastatic triple-negative breast cancer we performed a systematic review of phase III randomized controlled trials published from January 2006 to February 2013 and presentations at ESMO, ASCO, and SABCS congresses in 2010-2012. We consulted PubMed and ClinicalTrials.gov. Only studies comparing biological agents and chemotherapy versus chemotherapy alone were considered. Relevant statistical variables were log of the hazard ratio and relative variance for progression-free survival (PFS) and overall survival (OS). Of 353 PubMed publications and 229 studies registered on ClinicalTrials.gov, 10 trials were selected and 5293 patients were analyzed: 1546 had mTNBC. Biological agents considered were bevacizumab, sunitinib, sorafenib, lapatinib, iniparib and cetuximab. In addition, a meta analysis of the four studies containing bevacizumab was performed and it showed a PFS improvement with a relative risk reduction of 35% (95% CI: 25-43%). No effect on OS was observed. No PFS and OS benefit was detected with the other agents. No improvement of OS was detected in patients treated with biological agents plus chemotherapy, while a significant PFS improvement was observed only for bevacizumab and cetuximab. The overall impact of these agents on patient survival was not as great as expected, probably because the molecular basis of this illness needs to be better understood so that treatment can be more appropriately tailored.

Eribulin in cutaneous breast cancer metastasis treatment: clinical activity and symptom control.

AIM: This observational study evaluated the behavior and outcome of cutaneous breast cancer metastasis treated with eribulin. PATIENTS & METHODS: From November 2012 to January 2013, oncologists completed a database with patient, tumor and treatment characteristics from 14 Italian cancer centers. Skin lesions were assessed by Response Evaluation Criteria In Solid Tumors and cutaneous symptoms by present/absent criteria. RESULTS: A total of 23 metastatic breast cancer patients with skin metastasis who were treated with eribulin were analyzed. After treatment, 43% of patients exhibited a partial response, 35% stable disease and 22% progressive disease. Regarding only the skin response, 26% obtained a complete response, 22% a partial response, 39% stable disease and 13% progressive disease. We found an improvement in symptoms, infiltration and ulceration. With a median follow-up of 6 months, median progression-free survival was 4.3 months and median overall survival was 9.1 months. CONCLUSION: The response rate of skin metastasis to eribulin treatment was coherent with systemic responses. The good clinical response in most patients reflected symptom improvement.