725P - A phase I study of gemcitabine (GEM), cisplatin (CDDP), and S-1 combination in untreated patients (pts) with advanced biliary tract cancer (ABTC)

Date 29 September 2014
Event ESMO 2014
Session Poster Display session
Topics Anti-Cancer Agents & Biologic Therapy
Hepatobiliary Cancers
Presenter Toshikazu Moriwaki
Citation Annals of Oncology (2014) 25 (suppl_4): iv210-iv253. 10.1093/annonc/mdu334
Authors T. Moriwaki1, H. Ishida2, M. Araki3, S. Endo1, S. Yoshida2, M. Kobayashi1, Y. Hamano1, A. Sugaya1, M. Shimoyamada2, N. Hasegawa1, M. Imanishi1, Y. Ito2, D. Sato2, K. Ishige1, K. Fukuda1, M. Abei1, T. Yamaguchi2, I. Hyodo1
  • 1Division Of Gastroenterology, University of Tsukuba, 305-8577 - Tsukuba/JP
  • 2Department Of Gastroenterology, Mito Medical Center, Higashi Ibaraki-gun/JP
  • 3Division Of Gastroenterology, Ibaraki Prefecutual Central Hospital and Cancer Center, Kasama/JP

Abstract

Aim

GEM plus CDDP has been established as standard first-line chemotherapy based on the results of the phase III study (ABC-02) in ABTC. An oral FU derivative, S-1 showed a similar activity to GEM in a phase II study and is mainly used in GEM-refractory pts in Japan. To develop a triplet regimen, GEM + CDDP + S-1 (GPS), we assessed its safety in this phase I study.

Methods

The main eligibility criteria were; histologically or cytologically confirmed ABTC, ECOG Performance Status (PS) 0-2, no prior chemotherapy, and written informed consent. Dose limiting toxicities (DLT) were evaluated in following 2 dose levels; GEM (1000 mg/m2 at level 1 and 1200 mg/m2 at level 2 on day 1) + CDDP (fixed dose of 30 mg/m2 on day 1) + S-1 (fixed dose of 40—60 mg/day bid for 7 days), repeated every 2 weeks until progression. The relative dose intensity of GEM and CDDP at level 2 corresponded to 90% of standard GEM plus CDDP regimen. In each level, 6-10 pts were enrolled and assessed. DLTs were evaluated during the first 2 cycles.

Results

Between Oct 2011 and Oct 2013, 18 pts were enrolled and 16 pts were evaluated (median age: 71 years, ECOG PS 0/1: 10/6, intrahepatic/extrahepatic/gallbladder: 7/3/6). DLTs (grade 3 nausea to stop S-1 in cycle 1 and treatment delay due to grade 3 neutropenia in cycle 2) at level 1 were observed in 2 of the first 6 pts. Additional 4 pts enrolled at this dose level experienced no DLTs. A DLT (G3 anorexia) at level 2 was observed in 1 of 6 pts. Grade 3 or 4 treatment-related adverse events within the first 2 cycles were leukocytopenia (38%), neutropenia (50%), thrombocytopenia (0.6%), nausea (0.6%), and anorexia (0.6%). Of 14 pts with measurable lesions, 7 (50%) pts had partial response and 6 (43%) patients had stable disease. Median progression free survival was 9.2 months (95%CI 6.8-11.6, event in 63%) and overall survival did not reach the median value (event in 38%).

Conclusions

GPS of dose level 2 (GEM 1200 mg/m2 and 30 mg/m2 on day 1 plus S-1 for 1-7 days, given bi-weekly) was well tolerated, and showed preliminary anti-tumor activity. Further study is warranted. Clinical trial information: UMIN000006123.

Disclosure

T. Moriwaki: Research funding for other study and honoraria from Taiho Pharmaceutical; I. Hyodo: Research funding for other study from Taiho Pharmaceutical and Lilly. Honoraria from Taiho Pharmaceutical. All other authors have declared no conflicts of interest.