Cancer Research and Treatment

Original Article

Gastrointestinal cancer

A Phase 1b/2a Study of GC1118 with 5-Fluorouracil, Leucovorin and Irinotecan (FOLFIRI) in Patients with Recurrent or Metastatic Colorectal Cancer: Keun-Wook Lee, Sae-Won Han, Tae Won Kim, Joong Bae Ahn, Ji Yeon Baek, Sang Hee Cho, Howard Lee, Jin Won Kim, Ji-Won Kim, Tae-You Kim, Yong Sang Hong, Seung-Hoon Beom, Yongjun Cha, Yoonjung Choi, Seonhui Kim, Yung-Jue Bang; Cancer Res Treat. 2024;56(2):590-601. Published online December 7, 2023; DOI: https://doi.org/10.4143/crt.2023.1117

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Purpose
GC1118 is a novel antibody targeting epidermal growth factor receptor (EGFR) with enhanced blocking activity against both low- and high-affinity EGFR ligands. A phase 1b/2a study was conducted to determine a recommended phase 2 dose (RP2D) of GC1118 in combination with 5-fluorouracil, leucovorin, and irinotecan (FOLFIRI) (phase 1b) and to assess the safety and efficacy of GC1118 plus FOLFIRI as a second-line therapy for recurrent/metastatic colorectal cancer (CRC) (phase 2a).
Materials and Methods
Phase 1b was designed as a standard 3+3 dose-escalation study with a starting dose of GC1118 (3 mg/kg/week) in combination with biweekly FOLFIRI (irinotecan 180 mg/m²; leucovorin 400 mg/m²; 5-fluorouracil 400 mg/m² bolus and 2,400 mg/m² infusion over 46 hours) in patients with solid tumors refractory to standard treatments. The subsequent phase 2a part was conducted with objective response rate (ORR) as a primary endpoint. Patients with KRAS/NRAS/BRAF wild-type, EGFR-positive, recurrent/metastatic CRC resistant to the first-line treatment were enrolled in the phase 2a study.
Results
RP2D of GC1118 was determined to be 3 mg/kg/wk in the phase 1b study (n=7). Common adverse drug reactions (ADRs) observed in the phase 2a study (n=24) were acneiform rash (95.8%), dry skin (66.7%), paronychia (58.3%), and stomatitis (50.0%). The most common ADR of ≥ grade 3 was neutropenia (33.3%). ORR was 42.5% (95% confidence interval [CI], 23.5 to 62.0), and median progression-free survival was 6.7 months (95% CI, 4.0-8.0).
Conclusion
GC1118 administered weekly at 3 mg/kg in combination with FOLFIRI appears as an effective and safe treatment option in recurrent/metastatic CRC.

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European Journal of Medicinal Chemistry.2024; 279: 116872. CrossRef

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