Predictors of Response to Neoadjuvant Docetaxel-Carboplatin Chemotherapy for Patients With Stage II and III Triple Negative Breast Cancer
Neoadjuvant (preoperative) chemotherapy is an interesting research tool which allows investigators to test new drugs and/or new schedules with a validated surrogate endpoint, pCR. It also represents an ideal model to evaluate the relationships between treatments and tumor biomarkers. Recent publications have shown that new molecular classifications of breast cancer (intrinsic subtypes) have an important prognostic and predictive value. Using microarrays for gene expression profiling seems to be the best way to perform this classification; nevertheless such assays are not optimally available for common clinical practice. The IHC-based classification systems are still useful, as fresh tissue is not normally available in clinical practice, and has been shown to correlate well with intrinsic classification using gene expression microarrays. Recently the PAM50 gene set provided a risk of relapse score not only in ER-positive, node negative patients (similarly to the Oncotype Dx Recurrence Score) but also in the ER negative disease. Additionally, the PAM 50 assay was highly predictive of neoadjuvant response when considering all patients. This assay added significant prognostic and predictive value to pathologic staging, histologic grade, and standard clinical molecular markers while using an easy technique that can be performed in clinical practice because the qRT-PCR assay can be performed using FFEP tissue.
Triple Negative Breast Cancer (TNBC) is defined by a lack of expression of ER, PgR and HER-2. DNA microarray profiling studies have led to the classification of invasive breast carcinoma into five subtypes: luminal A and B, normal breast-like, HER2/neu overexpressing and basal-like subtypes, with clinical implications. Later on, a new subtype, the claudin-low, has been described. Although not synonymous, the majority of TNBCs carry the basal-like breast cancer (BLBC) molecular profile.
The triple negative subtype accounts for 11-20% of breast cancer in different studies, whereas in selected cohorts of patients with advanced breast cancer or African-American ethnicity, TNBC may be diagnosed among as many as 23-28%.
Patients with TN breast tumors treated with standard chemotherapy have a shorter DFS and OS than non-TNBC, this difference have been shown to be independent from tumor grade, nodal status and treatment in some studies. The peak risk of recurrence occurs within the first 3 years after initial treatment, with the majority of deaths occurring in the first five years.
Chemotherapy remains the only systemic treatment option available for TNBC patients. Several studies have shown that TNBC/BLBC is associated with an increased response rate to neoadjuvant chemotherapy when compared with luminal tumors. However, TNBC patients have a significantly decreased DFS and OS in comparison with luminal patients. The largest study exploring response and survival in early stage breast cancer treated with neoadjuvant chemotherapy was reported by Liedtke et al. Although an increase pCR rate was observed among the TNBC patients, they had a shorter lifespan than the non-TN ones. Patients experiencing pCR had an excellent OS regardless of hormone receptor expression, but patients with residual disease had a significantly shorter survival associated with TNBC compared with non-TN ones. This demonstrates that poor OS is derived from chemo-resistant patients (what unfortunately represent > 50% of them).
A relevant problem is the differential response to drugs of TN tumors. These tumors are usually treated with multidrug combinations including anthracyclines and taxanes, with pCR´s of 28-32%. Only recently, the results of a few small trials combining platinum salts and taxanes have been reported, with encouraging results (pCR of 44-77%). The taxane-platinum salt combinations have a biological background, since TN not associated BRCA1 mutations are sensitive to taxanes and resistant to anthracyclines and platinum salts are effective in TN tumors probably because a significant proportion of them have functional DNA repair deficiencies.
The primary objective of the study is to identify predictors of response to docetaxel-carboplatin in patients with triple negative primary tumors. Response is defined as lack of invasive tumor in breast plus axilla after neoadjuvant chemotherapy (PCR, pathological complete response).
|Study Design:||Observational Model: Case-Control
Time Perspective: Prospective
|Official Title:||Predictors of Response to Neoadjuvant Docetaxel-Carboplatin Chemotherapy for Patients With Stage II and III Triple Negative Breast Cancer|
- predictors of response to docetaxel-carboplatin in patients with triple negative primary tumors [ Time Frame: 6 months ]The primary objective of the study is to identify predictors of response to docetaxel-carboplatin in patients with triple negative primary tumors. Response is defined as lack of invasive tumor in breast plus axilla after neoadjuvant chemotherapy (PCR, pathological complete response).
- predictors of good pathological response and chemoresistance [ Time Frame: 3 months ]
- To identify predictors of good pathological response according to Symmans criteria (i.e. Symmans class 0+1)
- To identify predictors of chemoresistance (class III od Symmans)
- To assess the clinical response rate by standard methods (MRI, clinical examination, mammogram) in patients treated with this regimen.
- To evaluate breast conserving surgery rate in patients treated with this regimen.
- To evaluate the pCR rate in patients with known BRCA mutations.
|Study Start Date:||January 2012|
|Estimated Study Completion Date:||June 2017|
|Estimated Primary Completion Date:||March 2017 (Final data collection date for primary outcome measure)|
Doses of AUC 5-6 of carboplatin in combination with 75 mg/m2 of docetaxel are easily combined, being myelosuppression the most important toxicity. This combination has been studied in metastatic breast cancer as well as in the neoadjuvant setting. The combination of taxanes and platinum salts is increasingly used as neoadjuvant chemotherapy for TNBC. The docetaxel-carboplatin (TCb) regimen is an active and tolerable regimen in metastatic and locally advanced breast cancer, and the efficacy and toxicity characterization in the clinical setting are regaining interest in the era where the role of anthracyclines is controversial in the adjuvant setting. The avoidance of potentially serious long-term toxicities in specific breast cancer subtypes is a real challenge in an attempt to individualize therapies.
Drug: Docetaxel- Carboplatin
Docetaxel 75mg/m2 day 1 and Carboplatin(AUC6)day 1, each 21 days for 6 cycles.
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Please refer to this study by its ClinicalTrials.gov identifier: NCT01560663
|Contact: Miguel Martin, Medical Oncology||91 email@example.com|
|Hospital Universitario Gregorio Marañon||Recruiting|
|Madrid, Spain, 28007|
|Contact: Prof Miguel Martin, Medical Oncology 91 5869070 firstname.lastname@example.org|
|Principal Investigator: Prof Miguel Martin, Medical Oncology|