Breast cancer PAM50 signature: correlation and concordance between RNA-Seq and digital multiplexed gene expression technologies in a triple negative breast cancer series.

BACKGROUND: Full RNA-Seq is a fundamental research tool for whole transcriptome analysis. However, it is too costly and time consuming to be used in routine clinical practice. We evaluated the transcript quantification agreement between RNA-Seq and a digital multiplexed gene expression platform, and the subtype call after running the PAM50 assay in a series of breast cancer patients classified as triple negative by IHC/FISH. The goal of this study is to analyze the concordance between both expression platforms overall, and for calling PAM50 triple negative breast cancer intrinsic subtypes in particular. RESULTS: The analyses were performed in paraffin-embedded tissues from 96 patients recruited in a multicenter, prospective, non-randomized neoadjuvant triple negative breast cancer trial (NCT01560663). Pre-treatment core biopsies were obtained following clinical practice guidelines and conserved as FFPE for further RNA extraction. PAM50 was performed on both digital multiplexed gene expression and RNA-Seq platforms. Subtype assignment was based on the nearest centroid classification following this procedure for both platforms and it was concordant on 96% of the cases (N = 96). In four cases, digital multiplexed gene expression analysis and RNA-Seq were discordant. The Spearman correlation to each of the centroids and the risk of recurrence were above 0.89 in both platforms while the agreement on Proliferation Score reached up to 0.97. In addition, 82% of the individual PAM50 genes showed a correlation coefficient > 0.80. CONCLUSIONS: In our analysis, the subtype calling in most of the samples was concordant in both platforms and the potential discordances had reduced clinical implications in terms of prognosis. If speed and cost are the main driving forces then the preferred technique is the digital multiplexed platform, while if whole genome patterns and subtype are the driving forces, then RNA-Seq is the preferred method.

Correction to: Persistent major alopecia following adjuvant docetaxel for breast cancer: incidence, characteristics, and prevention with scalp cooling.

In the original publication of the article, Table 1 was published with incorrect caption and values. The Table 1 with corrected caption and values is given in this Correction.

Persistent major alopecia following adjuvant docetaxel for breast cancer: incidence, characteristics, and prevention with scalp cooling.

BACKGROUND: Persistent alopecia (PA) after docetaxel has been recently described. The aim of our study is to establish the incidence and characteristics of PA following adjuvant docetaxel for breast cancer (BC) and to test the ability of scalp cooling in prevention. PATIENTS AND METHODS: BC patients receiving adjuvant chemotherapy followed or not by endocrine therapy (and a control group receiving only endocrine therapy) were interviewed in a single institution at 1.5 to 5 years following primary diagnosis searching for PA. A confirmatory prevalence study was later performed in other two institutions. Finally, a prevention study using prophylactic scalp cooling (PSC) with ELASTO-GEL hypothermia caps in patients receiving adjuvant docetaxel was performed. RESULTS: In the initial prevalence study (492 patients), minor forms of PA (grade 1) were recorded with all chemotherapy regimens and aromatase inhibitors. Patients receiving docetaxel regimens at cumulative dose (CD) ≥ 400 mmg/m2 presented a significantly higher prevalence of grades 1 PA (33-52%) and 2 PA (5-12%). Prevalence of grade 2 PA with docetaxel CD ≥ 400 mmg/m2 was confirmed in two other institutions. Overall, grade 2 PA was seen in 10.06% (95% CI 7.36-13.61) of 358 patients with docetaxel regimens reaching CD ≥ 400 mmg/m2, but not in patients with lower docetaxel CD, other chemotherapy regimens, or endocrine therapy alone. In prevention trial, no grade 2 PA occurred among 116 patients receiving adjuvant docetaxel (≥ 400 mmg/m2) and PSC followed-up after a 96 months median time. PSC was well tolerated. No scalp relapses were seen among 30 patients (22% of all inclusions) having disease relapse. CONCLUSION: Adjuvant treatment with docetaxel (CD ≥ 400 mmg/m2) is associated with a significant rate of grade 2 PA, leading to wearing a wig, in around 10% of patients. This toxicity was completely prevented with scalp cooling. Clinical Trial Reference: NCT00515762.

Review: circulating tumor cells in the practice of breast cancer oncology

The primary cause of tumor-related death in breast cancer is still represented by distant metastasization. The dissemination of tumor cells from the primary tumor to distant sites through bloodstream cannot be early detected by standard imaging methods. Circulating tumor cells (CTCs) play a major role in the metastatic spread of breast cancer. Different analytical systems for CTCs isolation and detection have been developed and novel areas of research are directed towards developing assays for CTCs molecular characterization. This review describes the current state of art on CTCs detection techniques and the present and future clinical implications of CTCs enumeration and characterization (AU)

No disponible

Review: circulating tumor cells in the practice of breast cancer oncology.

The primary cause of tumor-related death in breast cancer is still represented by distant metastasization. The dissemination of tumor cells from the primary tumor to distant sites through bloodstream cannot be early detected by standard imaging methods. Circulating tumor cells (CTCs) play a major role in the metastatic spread of breast cancer. Different analytical systems for CTCs isolation and detection have been developed and novel areas of research are directed towards developing assays for CTCs molecular characterization. This review describes the current state of art on CTCs detection techniques and the present and future clinical implications of CTCs enumeration and characterization.

Chemobrain: ¿podemos hablar de un daño cerebral adquirido por quimioterapia? / Chemobrain: can we consider an acquired brain injury from chemotherapy?

Objetivo: Conocer el deterioro cognitivo producido por la quimioterapia en una muestra de pacientes con cáncer de mama frente a los controles y frente a sí mismas, antes y después del tratamiento. Pacientes y método: Estudio de corte longitudinal prospectivo. Se administró la Mini International Neuropsychiatric Interview, se evaluó depresión, ansiedad, función sexual, calidad de vida y sueño. Se midió memoria, atención, velocidad de procesamiento, memoria de trabajo, función ejecutiva y fluidez. Tanto la muestra inicial como la final fue de 19 pacientes y 19 controles. Resultados: Las pacientes presentaron diferencias en depresión, ansiedad, calidad de vida, función sexual y calidad de sueño frente al grupo control en el momento basal y a los seis meses. Se encontraron diferencias neurocognitivas entre pacientes y controles antes del tratamiento en memoria y en función ejecutiva y después del tratamiento en memoria, función ejecutiva e índice de función prefrontal. Conclusiones: Encontramos diferencias entre pacientes y controles antes de comenzar el tratamiento, síntomas de ansiedad, depresión, calidad de vida y sueño, en función sexual y en las variables neurocognitivas de memoria y función ejecutiva. Tras la quimioterapia, se observó declive en las pacientes respecto a los controles en: ansiedad, depresión, calidad de vida, calidad de sueño y función sexual y los dominios cognitivo de atención, memoria, función ejecutiva e índice de función prefrontal (AU)

Objective: To meet the cognitive impairment caused by chemotherapy in a sample of patients with breast cancer versus controls and themselves, before and after treatment. Patients and methods: Prospective longitudinal study. The Mini International Neuropsychiatric Interview was administered and other emotional symptoms like depression, anxiety, sexual function, quality of life and sleep was assessed. Memory, attention, processing speed, working memory, executive function and flow were measured. Both the initial and the final sample were 19 patients and 19 controls. Results: Patients differ in depression, anxiety, quality of life, sexual function, and quality of sleep versus controls at baseline and 6-month. Neurocognitive differences between patients and control group were found in memory before treatment and executive function. After treatment the differences were in memory, executive function and index of prefrontal function. Conclusion: There are significant differences between patients and control group before starting treatment, symptoms of anxiety, depression, quality of life and sleep, sexual function and neurocognitive variables in memory and executive function. After chemotherapy, decline was seen in patients respect control group in: anxiety, depression, and quality of life, quality of sleep and sexual function and cognitive domains of attention, memory, executive function and index of prefrontal function (AU)