Andressa Gonçalves Amorim

Breast cancer (BC) is the most prevalent cancer among Brazilian women, yet related data remain limited. The HER2-low classification has gained significance with the advent of targeted therapies. This study aimed to assess survival outcomes of HER2-low BC compared to other subtypes in a real-world Brazilian cohort. We analyzed data from 8,485 breast cancer patients treated at Pérola Byington Hospital between 2010 and 2019. Overall survival (OS) was the primary endpoint, stratified by cancer subtype. The t-test and chi-square test evaluated variable associations, while multivariate analysis calculated odds ratios and 95% confidence intervals. Cox regression assessed survival, and Kaplan–Meier curves illustrated OS differences. The patients with HER2-low breast cancers showed significantly better overall survival than those with the triple-negative subtype (p < 0.01). However, they had significantly poorer overall survival than those with the Luminal A-like subtype (p < 0.01). The patients with triple-negative HER2-low disease had a higher risk of mortality than those with HER2-0 (p < 0.01). Finally, patients who achieved pathological complete response experienced significantly better overall survival than those who did not (p < 0.01). Our findings highlight triple negative HER2-low BC as a distinct subtype identifiable via standard immunohistochemistry, beyond just biomarker status. The study underscores the prognostic diversity among BC subtypes and emphasizes the importance of personalized treatment strategies.

The role of axillary surgery in ductal carcinoma in situ (DCIS) remains controversial, particularly for cases diagnosed via vacuum-assisted biopsy (VAB), which may reduce “upstage” to invasive disease. This study evaluates the incidence of axillary metastasis and pathologic upstaging in DCIS to identify subgroups where axillary staging can be safely omitted. A retrospective cohort of 494 patients with pure DCIS diagnosed by VAB (2011–2019) was analyzed. Patients were stratified by age, nuclear grade, comedonecrosis, and surgical approach (breast-conserving surgery [BCS] vs. mastectomy). Axillary management included sentinel node biopsy (SNB), axillary dissection (AD), or omission. Multivariate logistic regression identified predictors of axillary surgery and upstaging to invasive carcinoma. Most patients underwent BCS (72.7%), with axillary evaluation performed in 35.1% of BCS cases versus 91.9% of mastectomies (p < 0.001). Only 3.8% (19/494) were upstaged to invasive carcinoma, and nodal involvement occurred in 1.2% (3/250) of axillary procedures—all in patients with invasive foci on final pathology. No pure DCIS cases had nodal metastasis. Younger age (< 40 years, p = 0.039), high nuclear grade (grade 3, p = 0.006), and mastectomy (p < 0.001) independently predicted axillary surgery. Comedonecrosis and palpable lesions were associated with higher SNB rates but not nodal positivity. Routine axillary surgery is unnecessary in VAB-diagnosed DCIS. Omission of SNB appears safe for patients undergoing BCS without high-risk features (palpability, high grade). Axillary staging may be reserved for mastectomy candidates or those with suspicions imaging of invasive disease.

Background: Ductal carcinoma in situ (DCIS) is a precursor of invasive breast cancer and its early diagnosis and treatment are essential to prevent progression and recurrences. Risk stratification guidelines, such as the Van Nuys Prognostic Index (VNPI) and those by the National Comprehensive Cancer Network (NCCN), help guide appropriate treatment. This study compares VNPI recommendations for DCIS patients treated at Hospital do Servidor Público Estadual de São Paulo (HSPE) with NCCN guidelines, focusing on treatment conducted and recurrence rates. Methods: This retrospective, cross-sectional study reviewed medical records of 145 patients treated for DCIS at HSPE between January 1996 and June 2022, with a mean follow-up of 60.3 months. Results: Based on VNPI, 38.8% were low risk, 53.2% intermediate risk, and 7.8% high risk. NCCN guidelines classified only 12.9% as low risk and 87.1% as high risk. Treatment included breast-conserving surgery (BCS) with radiotherapy (43.1%), BCS alone (38.8%), and mastectomy (18.1%). There were 18 recurrences (15.5%): 5.2% as DCIS and 10.3% as invasive cancer. Of these recurrences, 5.6% occurred in patients who, according to NCCN, would have received BCS with radiotherapy or mastectomy. Conclusion: By integrating the VNPI with NCCN treatment guidelines, the NCCN’s recommendations could potentially reduce local recurrence rates by 5.6%. However, further studies are necessary to evaluate the long-term impact of these guidelines on overall survival outcomes.

Body mass index (BMI) is a key factor in the progression of breast cancer (BC), with conflicting evidence on its influence on pathological complete response (pCR) following neoadjuvant chemotherapy (NAC). Despite these global findings, studies focusing on real-world Brazilian data remain scarce. This study aimed to evaluate the impact of BMI on pCR rates, recurrence-free survival (RFS), and overall survival (OS) in Brazilian women with BC treated with NAC. A retrospective cohort of 1,751 patients with stage I–III invasive primary BC treated between January 2011 and December 2020 at two public healthcare centers Hospital Pérola Byington (HPB) and Hospital do Servidor Público Estadual (HSPE) in Brazil was analyzed. Data included BMI categories (normal, overweight, and obese) and their associations with pCR, RFS, and OS outcomes. Obesity was prevalent (35.5%) among the cohort, with most patients being postmenopausal (50.9%). Tumors were predominantly stage III invasive ductal carcinoma, with triple-negative and luminal B subtypes being the most common. Radical surgery was performed in 79.8% of cases, achieving a pCR rate of 22.3%, and 30.9% of patients experienced recurrence, predominantly systemic (27.7%). No significant differences in pCR, RFS, or OS were observed across BMI categories. BMI was not associated with pCR, RFS, or OS in this large Brazilian cohort, highlighting the need for further studies to explore BMI dynamics during treatment and its potential influence on therapeutic outcomes. Future investigations in diverse healthcare settings may provide additional insights into optimizing breast cancer management across BMI strata.