Integrated preclinical and clinical development of S-trans, trans-farnesylthiosalicylic acid (FTS, Salirasib) in pancreatic cancer

Daniel Laheru, Preeti Shah, N. V. Rajeshkumar, Florencia McAllister, Gretchen Taylor, Howard Goldsweig, Dung T. Le, Ross Donehower, Antonio Jimeno, Sheila Linden, Ming Zhao, Dongweon Song, Michelle A. Rudek, Manuel Hidalgo

Research output: Contribution to journalArticlepeer-review

79 Scopus citations


Purpose S-trans,trans-Farnesylthiosalicylic Acid (FTS, salirasib) inhibits Ras-dependent cell growth by dislodging all isoforms of Ras, including mutant Ras, from the plasma membrane. This study evaluated the activity, safety, and toxicity of salirasib in preclinicalmodels and patients with metastatic pancreatic adenocarcinoma (PDA). Patients and methods In the preclinical study, salirasib was tested, alone and in combination with gemcitabine, in patient derived xenografts (PDX) of PDA. In the clinical study, treatment-naïve patients with advanced, metastatic PDA were treated with a standard dose schedule of gemcitabine and salirasib 200-800mg orally (PO) twice daily (bid) for 21 days every 28 days. Tissue from preclinical models and patients' biopsies were collected pre-treatment and on Cycle (C) 1, Day (D) 9 to characterize the effect of gemcitabine and salirasib on activated Ras protein levels. Plasma samples for pharmacokinetics were collected for salirasib administered alone and in combination. Results Salirasib inhibited the growth of 2/14 PDX models of PDA and modulated Ras signaling in these tumors. Nineteen patients were enrolled. No DLTs occurred. Common adverse events included hematologic and gastrointestinal toxicities and fatigue. Themedian overall survival was 6.2months and the 1 year survival 37 %. In 2 patients in whom paired tissue biopsies were available, Ras and KRas protein levels were decreased on C1D9. Salirasib exposure was not altered by gemcitabine and did not correlate with PD outcomes. Conclusion The combination of gemcitabine and salirasib appears well-tolerated, with no alteration of salirasib exposure, and exerted clinical and PD activity in PDA.

Original languageEnglish (US)
Pages (from-to)2391-2399
Number of pages9
JournalInvestigational New Drugs
Issue number6
StatePublished - Dec 2012


  • Gemcitabine
  • Pancreatic cancer
  • Phase I
  • RAS
  • Salirasib

ASJC Scopus subject areas

  • Oncology
  • Pharmacology
  • Pharmacology (medical)


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