In the orthotopic KPC1245 pancreatic tumor model, epacadostat plus PLP, with or without IL15, reduced tumor burden. Epacadostat, PLP and IL15 alone had tumor burdens comparable to control. [2]
In established AML xenografts, epacadostat-containing chow combined with Ara-C reduced bone-marrow and splenic AML burden. This small four-arm experiment used 1.6 g epacadostat/kg diet; that dietary concentration is not a body-weight-normalized daily dose. [3]
Antitumor activity was model-dependent. In the Eμ-TCL1 mouse CLL model, epacadostat at 4 mg/mouse daily by oral gavage did not provide sustained disease control, and endpoint spleen burden and leukemic-cell proliferation were similar to vehicle. [4]
Combination efficacy and single-agent limits in pancreatic tumors
Animal study · Syngeneic orthotopic KPC1245 pancreatic tumors in mice [2]
At the day-22 tumor-weight endpoint, epacadostat, PLP and IL15 monotherapies had tumor burdens comparable to control. Epacadostat plus PLP, with or without IL15, reduced tumor burden. Combination outcomes are not assigned to epacadostat monotherapy.
- Saline control
- Model: Syngeneic orthotopic KPC1245 pancreatic tumors in mice
- Treatment course: Tumor weight assessed on day 22
- Vehicle: Saline
- Epacadostat alone
- Model: Syngeneic orthotopic KPC1245 pancreatic tumors in mice
- Route: Oral gavage
- Frequency: Daily
- Treatment course: Started on day 7 after implantation; tumor-weight endpoint day 22
- Reported limits: Drug formulation not specified in the read methods.
- PLP alone
- Model: Syngeneic orthotopic KPC1245 pancreatic tumors in mice
- Route: Intraperitoneal
- Frequency: Daily
- Treatment course: Started on day 7 after implantation; tumor-weight endpoint day 22
- Epacadostat + PLP
- Model: Syngeneic orthotopic KPC1245 pancreatic tumors in mice
- Route: Epacadostat: oral gavage; PLP: intraperitoneal
- Frequency: Daily
- Treatment course: Started on day 7 after implantation; tumor-weight endpoint day 22
- IL15 alone
- Model: Syngeneic orthotopic KPC1245 pancreatic tumors in mice
- Route: Intraperitoneal
- Frequency: Days 7, 9 and 11
- Treatment course: Tumor-weight endpoint day 22
- Epacadostat + PLP + IL15
- Model: Syngeneic orthotopic KPC1245 pancreatic tumors in mice
- Route: Epacadostat: oral gavage; PLP and IL15: intraperitoneal
- Frequency: Epacadostat/PLP daily from day 7; IL15 days 7, 9 and 11
- Treatment course: Tumor-weight endpoint day 22
Methods and source locations
Compound reported in the paper: Epacadostat (INCB024360); Compound label in the paper: IDO1i / INCB024360
Compound-level research evidence; no salt conversion, stereochemical equivalence or current Adooq lot validation inferred.
Figure 2D-E and caption; Supplementary Figure S2G (official PDF p.2); Methods Vitamin B6 Diet, Treatment, and Reagents
KPC1245 tumor weight on day 22: Mean ± SEM; one-way ANOVA with Tukey multiple comparisons. No exact tumor weights inferred from bars. — Figure 2E and caption; Figure 2D
Saline control · Figure 2D-E; Supplementary Figure S2G; Methods Vitamin B6 Diet, Treatment, and Reagents
Epacadostat alone · Figure 2D-E; Supplementary Figure S2G; Methods Vitamin B6 Diet, Treatment, and Reagents
PLP alone · Figure 2D-E; Supplementary Figure S2G; Methods Vitamin B6 Diet, Treatment, and Reagents
Epacadostat + PLP · Figure 2D-E; Supplementary Figure S2G; Methods Vitamin B6 Diet, Treatment, and Reagents
IL15 alone · Figure 2D-E; Supplementary Figure S2G; Methods Vitamin B6 Diet, Treatment, and Reagents
Epacadostat + PLP + IL15 · Figure 2D-E; Supplementary Figure S2G; Methods Vitamin B6 Diet, Treatment, and Reagents
Epacadostat chow and chemotherapy in established AML xenografts
Animal study · Established patient-derived AML xenografts in NSG mice [3]
A three-week four-arm experiment compared control chow, epacadostat chow, Ara-C and their combination. The combination reduced marrow and splenic AML burden. The authors described synergy only in marrow; this package reports the observed combination result without adopting a formal synergy claim.
- Control chow
- Model: Established patient-derived AML xenografts in NSG mice
- Frequency: Ad libitum chow
- Treatment course: Three weeks; endpoint 11 weeks after transplant
- Vehicle: Control chow
- Epacadostat chow
- Model: Established patient-derived AML xenografts in NSG mice
- Route: Dietary
- Frequency: Ad libitum
- Treatment course: Three weeks from approximately week 8 after transplant
- Vehicle: Supplemented chow
- Reported limits: Diet concentration is not mg/kg body weight/day; intake not quantified.
- Ara-C
- Model: Established patient-derived AML xenografts in NSG mice
- Route: Intraperitoneal
- Frequency: Daily for 5 days
- Treatment course: Days 1–5 of the three-week experiment
- Vehicle: Control chow
- Epacadostat chow + Ara-C
- Model: Established patient-derived AML xenografts in NSG mice
- Route: Epacadostat: dietary; Ara-C: intraperitoneal
- Frequency: Chow ad libitum for 3 weeks; Ara-C daily for 5 days
- Treatment course: Endpoint approximately 11 weeks after transplant
- Vehicle: Supplemented chow
- Reported limits: No body-weight dose inferred from diet concentration.
Methods and source locations
Compound reported in the paper: Epacadostat (INCB024360); Compound label in the paper: Epac. / epacadostat
Compound-level research evidence; no salt conversion, stereochemical equivalence or current Adooq lot validation inferred.
Figure 6I-K and caption; Methods Epacadostat; mouse models/combination therapy
AML burden in bone marrow and spleen after combination treatment: Mean ± SEM; Figure 6 caption specifies one-way ANOVA and additional unpaired t-test comparisons in marrow. Exact bar values are not reconstructed. — Figure 6J-K and caption; Results Pharmacologic targeting subsection
Control chow · Figure 6I-K and caption; Methods Epacadostat and Combination therapy
Epacadostat chow · Figure 6I-K and caption; Methods Epacadostat and Combination therapy
Ara-C · Figure 6I-K and caption; Methods Epacadostat and Combination therapy
Epacadostat chow + Ara-C · Figure 6I-K and caption; Methods Epacadostat and Combination therapy
Lack of sustained disease control in mouse CLL
Animal study · Syngeneic Eμ-TCL1 adoptive-transfer CLL model in wild-type mice [4]
Epacadostat produced a small, statistically nonsignificant early decrease in circulating CLL burden that disappeared later. Endpoint spleen weight, splenic tumor burden and CLL-cell KI67 positivity were similar to vehicle. The result limits generalization of antitumor activity across models.
Conditions shared by the study groups
- Route
- Oral gavage
- Frequency
- Daily
- Vehicle
- 0.5% methylcellulose
- Vehicle control
- Model: Syngeneic Eμ-TCL1 adoptive-transfer CLL model in wild-type mice
- Reported limits: Endpoint timing internally inconsistent; see review.
- Epacadostat
- Model: Syngeneic Eμ-TCL1 adoptive-transfer CLL model in wild-type mice
- Treatment course: Started 2 weeks after transfer; exact endpoint duration unresolved
- Reported limits: Figure 3 caption implies 3 treatment weeks; Results says 4 weeks. Do not convert dose to mg/kg.
Methods and source locations
Compound reported in the paper: Epacadostat (INCB024360); Compound label in the paper: Epa / INCB024360
Compound-level research evidence; no salt conversion, stereochemical equivalence or current Adooq lot validation inferred.
Figure 3A-D and caption; Results epacadostat paragraphs; Methods 2.5 and 2.6
Peripheral-blood CD5+CD19+ CLL-cell frequency: Means ± SEM; Welch t-test; blood plot labels weeks 0–3 after treatment start. — Figure 3A and Results epacadostat paragraph
Spleen weight, splenic CLL burden and KI67-positive CLL cells: Means ± SEM; Welch t-test. Four of 20 mice excluded before allocation for failed engraftment; 8/group treated, with 2 control and 1 treated deaths before endpoint analysis. — Figure 3B-D and caption; Methods 2.5
Vehicle control · Figure 3A-D and caption; Methods 2.5; Results epacadostat paragraphs
Epacadostat · Figure 3A-D and caption; Methods 2.5; Results epacadostat paragraphs