Syngeneic tumor models to test strategies leveraging the efficacy of anti-PD1 & anti-PDL1 inhibitors

    • Model features: intact immune system, anti-PD1/PD-L1 responding & non-responding tumor models
    • Tumor cell line:  Breast Cancer (4T1, EMT6), Colon Cancer (CT26, MC38), Gliobastoma (GL261), Lung Cancer (LLC1), Pancreatic cancer (Pan02), Renal Cancer (Renca), Sarcoma (MCA205)
    • Tumor implantation: subcutaneous or orthotopic
    • Robust treatment protocols using classical well-described antibody clones, in line with published literature data
    • Readouts: body weight, tumor size, survival
syngeneic tumor models efficacy anti-PD1 PDL1 mabs antibody immunotherapy CRO

Differential PD1/PDL1 blockade efficacy in different syngeneic mouse models
PD1/PDL1 blockade enhances survival of MC38, moderately that of GL261, but very slightly that of CT26. Mice are challenged with respective tumor cells and exposed to anti-PD1 or anti-PDL1 antibody. In the MC38 responding model, both anti-PD1 and anti-PDL1 antibodies improve mouse survival.

In vivo efficacy & mechanism of action studies for novel immunotherapies

in vivo efficacy study CRO breast cancer

Straightforward in vivo efficacy studies

  • N=10: Standard groups of 10 mice including groups exposed to test compound alone and in combination with reference therapy.
  • Weekly reports: monitoring tumor growth, body weight, and survival
in vivo cancer immunotherapy studies CRO services

Flexible sampling options

  • Monitoring response over time: satellite mice, serial bleeding, intra-tumoral biopsies
  • On-demand sample collection: blood, serum, plasma, tumor, organ samples
in vivo mechanism actin immunotherapy breast cancer

A flexible platform to quantify tumor-microenvironment & peripheral markers

  • Multiplex immunophenotyping by flow cytometry & digital pathology
  • Spatial transcriptomics & proteomics

Illustrative data: anti-tumor response to anti-PD1 inhibition in syngeneic MCA205 model

Tumor infiltrating lymphocytes profiling of MCA205 tumor-bearing mice upon anti-PDL1 blockade

Flow cytometry analysis of MCA205 tumors highlights a higher immune cell infiltration within the tumor upon PDL1 blockade. Anti-PDL1 antibody treatment of MCA205-timor bearing mice leads to a higher number of Tumor infiltrating lymphocytes (CD45+). This feature is associated with an increase in T cells (CD3+) and particularly with an accumulation of effector T cells (CD8+). In contrast, CD4+ T cells infiltration of the tumor is slightly decreased upon treatment.

PD1 PDL1 cancer immunotherapy FACS flow cytometry profiling- syngeneic cancer model CRO

Why working with Explicyte?

in Immuno-Oncology

  • 150+ in vivo campaigns conducted over the past 10 years
  • 20+ peer-reviewed publications in key immuno-oncology journals
  • Bespoke study designs based on client objectives and literature


  • A dedicated study director (PhD level) from experimental plan to final report
  • Weekly reports to provide regular updates & adapt experimental strategy
  • Comprehensive analytical platform to decipher anti-tumor response

Your contacts

explicyte team 2024

Talk to our team ! Your key contacts:

Study directors: Paul Marteau, PharmD (not on picture), Jean-Philippe Guégan, PhD Leadership: Imane Nafia, PhD (CSO), Alban Bessede, PhD (founder, CEO), Loic Cerf, MSc (COO)

Tell us about your project !

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    In Vivo Models Of PD-1/PD-L1 Axis Blockade I Cancer Immunotherapy CRO services

    While targeting the PD1/PDL1 axis with therapeutic antibodies (eg. nivolumab / atezolizumab) offers unprecedented clinical benefit in metastatic melanoma and lung cancer, durable responses are observed only in a fraction of patients. Current lines of investigations on such therapies mainly aim at evaluating and identifying novel drugs capable of leveraging the efficacy of PD-1/PD-L1 axis blockade. In this respect, Explicyte offers a range of syngeneic mice models of anti-PD-1 and/or anti-PD-L1 antibody therapy. Furthermore, preclinical efficacy data can be strengthened by ancillary immune cell profiling and MOA studies – relying on key immunological markers quantification, within the tumor or in peripheral organs – thereby allowing a deep interrogation of the immune response elicited by test compounds. Our models can also support for the identification of innovative and novel predictive biomarkers. Combinatory approaches in immuno-oncology with immune checkpoint inhibitors including anti-PD1 / PDL1 or anti-CTLA4 therapeutic antibodies is an active field of investigation. In order to evaluate potential synergistic effect of novel chemotherapeutic agents, immunostimulatory compounds, etc., we characterized the clinical response to anti-PD1 and anti-PDL1 in immunocompetent animal models. Ancillary studies including FACS analysis, RT-qPCR can provide support to delineate mechanism of actions of a drug candidate and can also support the identification of novel predictive biomarkers.

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