Journal Article

Stromal disrupting effects of nab-paclitaxel in pancreatic cancer

Megias, D, Muñoz, M, Rodriguez-Pascual, J, Cubillo, A, Plaza, C, Prados, S, Musteanu, M, de Vicente, E, Garcia-Garcia, E, Lopez-Rios, F, Guerra, C, Quijano, Y, Barbacid, M, Alvarez, R, Hidalgo, M, Lopez-Casas, P P, Tabernero, S

2013

Overview

Background: Nab-paclitaxel and gemcitabine have demonstrated a survival benefit over gemcitabine alone in advanced pancreatic cancer (PDA). This study aimed to investigate the clinical, biological, and imaging effects of the regimen in patients with operable PDA. Methods: Patients with operable PDA received two cycles of nab-paclitaxel and gemcitabine before surgical resection. FDG-PET and CA19.9 tumour marker levels were used to measure clinical activity. Effects on tumour stroma were determined by endoscopic ultrasound (EUS) elastography. The collagen content and architecture as well as density of cancer-associated fibroblasts (CAFs) were determined in the resected surgical specimen and compared with a group of untreated and treated with conventional chemoradiation therapy controls. A co-clinical study in a mouse model of PDA was conducted to differentiate between the effects of nab-paclitaxel and gemcitabine. Results: A total of 16 patients were enrolled. Treatment resulted in significant antitumour effects with 50% of patients achieving a >75% decrease in circulating CA19.9 tumour marker and a response by FDG-PET. There was also a significant decrement in tumour stiffness as measured by EUS elastography. Seven of 12 patients who completed treatment and were operated had major pathological regressions. Analysis of residual tumours showed a marked disorganised collagen with a very low density of CAF, which was not observed in the untreated or conventionally treated control groups. The preclinical co-clinical study showed that these effects were specific of nab-paclitaxel and not gemcitabine. Conclusion: These data suggest that nab-paclitaxel and gemcitabine decreases CAF content inducing a marked alteration in cancer stroma that results in tumour softening. This regimen should be studied in patients with operable PDA.

• Publisher: Nature Publishing Group UK,Nature Publishing Group
• Subject: 692/699/67/1059/99 / 692/699/67/1504/1713 / Adenocarcinoma - drug therapy / Adenocarcinoma - metabolism / Adenocarcinoma - pathology / Adult / Aged / Aged, 80 and over / Albumins - administration & dosage / Albumins - pharmacology / Animals / Antineoplastic Combined Chemotherapy Protocols - therapeutic use / Biological and medical sciences / Biomedical and Life Sciences / Biomedicine / CA-19-9 Antigen - blood / Cancer Research / Clinical Study / Collagen - drug effects / Deoxycytidine - administration & dosage / Deoxycytidine - analogs & derivatives / Deoxycytidine - pharmacology / Disease Models, Animal / Drug Resistance / Elasticity Imaging Techniques / Endosonography / Epidemiology / Female / Fibroblasts - drug effects / Fibroblasts - pathology / Gastroenterology. Liver. Pancreas. Abdomen / Gemcitabine / Humans / Liver. Biliary tract. Portal circulation. Exocrine pancreas / Male / Medical sciences / Mice / Middle Aged / Molecular Medicine / Multiple tumors. Solid tumors. Tumors in childhood (general aspects) / Neoadjuvant Therapy / Oncology / Paclitaxel - administration & dosage / Paclitaxel - pharmacology / Pancreatic cancer / Pancreatic Neoplasms - drug therapy / Pancreatic Neoplasms - metabolism / Pancreatic Neoplasms - pathology / Positron-Emission Tomography / Tumors