"Curcumin" in Combination With Chemotherapy in Advanced Breast Cancer

RATIONALE

Various preclinical, clinical, and animal studies suggest that curcumin has potential as an antiproliferative, anti-invasive, and antiangiogenic, as a mediator of chemoresistance, chemopreventive, and as a therapeutic agent. However, the main problem associated with the use of curcumin in humans is its low absorption from the gastrointestinal tract, poor solubility in body fluids and low bioavailability. To overcome the pharmacokinetic and bioavailability limitations of oral administration, water soluble curcumin, Curcumin® (CUC-01) injection, a clear, yellow viscous solution intended for dilution with a suitable parenteral fluid prior to intravenous infusion was elaborated. Curcumin® (CUC-01) injection is patented pharmacy product and sold per individual prescription in Germany and other countries for Cancer Centers. However, clinical efficacy and safety of these formulation have to be confirmed in this study.

Development of multidrug resistance (MDR) against a variety of conventional and novel chemotherapeutic agents is a significant challenge in effective cancer therapy. Paclitaxel, one of the most prescribed conventional chemotherapeutic agents, acts as microtubule stabilizer and blocks cancer cells in the G2/M phase, thus preventing them from mitosis. It is also an apoptosis inducer in cancer cells. However, one of the main drawbacks of its use is that it is also a substrate of P-gp and treatment with PCL induces the overexpression of the efflux pump in the cancer cells. NF-κB is a transcription factor that controls the expression of genes involved in a number of physiological responses including differentiation, inflammation, apoptosis and upregulation of the P-gp. The PI3K/Akt pathway is also another over-activated pathway in a wide range of tumor types and therefore its over-activation leads to increased cancer-cell survival, proliferation, and growth and it also promotes NF-κB activity, all affects the success of the chemotherapy with Paclitaxel. Curcumin is known to downregulate both the PI3K/Akt and NF-κB pathways independent of each other, and thus it can act as a mediator of chemoresistance by sensitizing cancer cells to a conventional chemotherapeutic agents.

It has been suggested that co-administration of Paclitaxel and curcumin will help to overcome multidrug resistance in cancer. Synergistic interaction of curcumin and paclitaxel was demonstrated in paclitaxel (Taxol)-resistant breast cancer cells, human breast cancer xenograft model, in MDA-MB-231 and MCF-7 human breast cancer cells and many other cancer cell lines. In vivo, this combination treatment produced a three-fold tumor inhibition with each of these cell lines. Furthermore, the combination of paclitaxel and curcumin exerted increased anti-tumor efficacy on mouse models These results clearly indicate combination of Curcumin with paclitaxel could have significant clinical advantages for the treatment of breast cancer.

Curcumin exerted in vitro anti-breast cancer activities through regulation of matrix metalloproteinase (MMP)-2, B-cell lymphoma 2 (Bcl-2), Bax, flap endonuclease 1 (Fen1), NF-E2-related factor 2 (Nrf-2) factors, and phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt) signaling.

Therefore, and based on this evaluation, we intend examining the effect of Curcumin ®, (CUC-01) in advanced and metastatic breast cancer in this randomized, double-blind, placebo-controlled study.

STUDY DESIGN

This is a randomized, double-blind, placebo-controlled, two arms parallel group phase 2 study:

Group A, 75 patients, treatment with Curcumin (CUC-01, yellow solution), 300mg i.v. plus i.v. Paclitaxel (colorless solution) 80 mg /m2 BS i.e., once weekly for 12 weeks.

Group B, 75 patients, treatment with Paclitaxel (colorless solution) 80 mg /m2 BS, i.v. plus placebo i.v. solution (250 ml, yellow solution for masking/blinding), once weekly for 12 weeks.

Therapy schedule weekly:

• Preload-infusion containing Dexamethasone 8 mg in 100ml NaCl
• Paclitaxel 80mg/m2 body surface in 250 ml 0.9% NaCl
• Curcumin 300 mg or placebo in 250ml 0.9% NaCl

PRIMARY OBJECTIVE

To assess:

• Efficacy of combined therapy with Curcumin ®, (CUC-01) and Paclitaxel vs Paclitaxel in patients with advanced and metastatic breast cancer in terms of Objective Response Rate (ORR)

SECONDARY OBJECTIVES

To assess:

• The safety of Curcumin+Paclitaxel combination compared to Paclitaxel+placebo treatment by assessment of adverse effects.
• Quality of life (QOL) in patient treated with Curcumin+Paclitaxel combination compared to Paclitaxel+Placebo
• Response duration in terms of Progression free survival (PFS), and Time to Disease Progression (TTP) and Time to treatment failure (TTTF)

NUMBER OF SUBJECTS

150

TEST PRODUCT, DOSE, AND ROUTE OF ADMINISTRATION

Curcumin® (CUC-01) injection, BRIU GmbH at dose 300 mg. Each vial contains 20 ml of the concentrate (concentration of Curcumin - 15 mg/ml) containing in total of 300 mg of Curcumin, which has to be diluted in 250 ml of physiological solution (0.9% NaCl) before use, total volume - 270 ml of infusion solution.

Investigational Active Ingredients: Curcuminoids (syn: Curcumin, isolated from turmeric rhizome Curcuma longa, Zingiberaceae.

CUC-01 will be administered intravenously (IV) once in every 7 days for 12 weeks.

Therapy schedule weekly:

• Preload-infusion containing Dexamethasone 8 mg in 100ml NaCl
• Curcumin 300 mg in 250ml 0.9% NaCl
• Paclitaxel 80mg/m2 body surface in 250 ml o.9% NaCl

CONTROL PRODUCT, DOSE AND ROUTE OF ADMINISTRATION

Placebo: Riboflavin solution which has strong yellow-orange color and visually is not distinguishable from Curcumin.

Placebo will be administered intravenously (IV) once in every 7 days for 12 weeks

Therapy schedule weekly:

• Preload-infusion containing Dexamethasone 8 mg in 100ml NaCl
• Placebo(Riboflavin solution) in 250ml 0,9% NaCl
• Paclitaxel 80mg/m2 body surface in 250 ml 0.9% NaCl

EFFICACY EVALUATIONS.

Primary endpoint

Primary outcome measures:

Clinically, radiologically measurable disease, tumour markers:

• Objective response rate, assessed with the Modified Response Evaluation Criteria In Solid Tumours (RECIST) using plain radiographs, ultrasound imaging, computed tomography scans and magnetic resonance imaging. Other studies may be acceptable with the approval of the principal investigator.
• Carcinoembryonic antigen (CEA) assay and Cancer antigen15-3 (CA 15-3) assay

Secondary endpoints.

Secondary outcome measures:

• Adverse events and defined by National Cancer Institute (NCI) Common Toxicity Criteria Version 4.0 (CTCAE, v4.0≤)
• Quality of Life measures (EORTC QLQ-C30, Global Health Status/QoL scales)Response Duration measures:
• Progression free survival (PFS) assessed from study enrolment to tumour progression as per the Modified RECIST criteria or disease related
• Time to Treatment Failure (TTTF), assessed from study enrolment to cessation of study treatment for any reason
• Time to Tumour Progression (TTP), assessed from study enrolment to tumour progression as per the Modified RECIST criteria.

Safety Evaluations

Tolerability will be assessed by the nature and incidence of adverse events. Change in clinical safety labs from baseline to end of the study Incidence of adverse events, (CTCAE, v4.0≤).

STATISTICS

Statistical analysis will be performed on an intent-to-treat basis. Survival Analysis for time-to event endpoints.

Assessment of baseline characteristics - between groups comparison will be made by:

• Kruskal-Wallis (KW) non-parametric one way ANOVA rank order test, with post hoc Dunn's Multiple Comparison Test or
• parametric One-way independent measures ANOVA with Dunnett's Multiple Comparison Test,

Analysis of changes within treatment groups in the course of the study (before versus after) was performed by:

• paired t-test (parametric data - variables with normal distribution) or/and
• Wilcoxon signed rink test (nonparametric data), or
• Friedman test for repeated several measures (nonparametric data),

Assessment of efficacy of study medications was achieved by between groups comparison of mean changes from the baseline (differences before and after treatment of every single patient) using:

• Kruskal-Wallis (KW) non-parametric one way ANOVA rank order test, with post hoc Dunn's Multiple Comparison Test, and/or
• parametric One-way independent measures ANOVA with Tukkey's Multiple Comparison Test (variables with normal distribution).

Survival Analysis Statistical tools (Kaplan-Mayer analysis with log-rank test, Cox regression etc.) will be used for assessment of the TTP, PFS and TTTF.