Major response to immunotherapy in early-stage mismatch repair deficient colon cancer

October 22, 2018

Munich, Germany, 22 October 2018 - Pre-operative treatment with a combination of the immune checkpoint inhibitors nivolumab and ipilimumab achieves major pathological responses in 100% of early-stage colon cancers with mismatch repair deficiencies, according to results reported at ESMO 2018 (1) from the first exploratory phase II trial to investigate this approach.

Restoring patients' immune response against cancer cells with checkpoint inhibitors is an established treatment strategy for several tumour types. These agents are of particular interest in mismatch repair deficient (dMMR) tumours because they have high mutational load and upregulation of immune checkpoints (2).

Checkpoint inhibitors have previously shown durable responses in metastatic colorectal cancers so the new study investigated whether neoadjuvant treatment in dMMR early-stage colon cancer would achieve clinically significant response rates.

The exploratory trial treated 14 patients with early-stage colon cancer with the checkpoint inhibitors nivolumab (two doses of 3mg/kg on day 1 and 15) and ipilimumab (one dose of 1mg/kg on day 1) before surgery. The two drugs act in different ways to restore immune responses: ipilimumab blocks cytotoxic T lymphocyte associated protein 4 (CTLA-4) and nivolumab blocks programmed cell death protein 1 (PD-1).

Results reported at ESMO 2018 showed that 100% (7/7) of the patients with dMMR colon cancer had major pathological responses (defined as <5% of viable tumour cells remaining). Four of these seven patients (57%) had complete responses.

In contrast, no major pathological responses were seen in pMMR tumours, however there were significant increases in T-cell infiltration.

The immunotherapy regimen was well tolerated and all of the patients underwent radical resection of their tumours without delays in surgery.

"This is the first study with immune checkpoint inhibitors in early stage colon tumours. Our data suggest that neoadjuvant immunotherapy in dMMR colon cancer warrants further research and has the potential to change the standard of care," said lead author Dr Myriam Chalabi, from the Netherlands Cancer Institute, Amsterdam, Netherlands. She commented: "The response we saw is much more dramatic than in metastatic disease, which we did not expect."

"For MMR deficient tumours, the results were amazing, with 100% of patients so far having either complete or near complete responses within the short timeframe of treatment, which is usually 4 weeks," she continued. "I think the finding will have implications for clinical practice in the future. At this stage, it's too early to call it practice changing but it could be if similar results are seen in larger studies."

Commenting on the study for ESMO, Dr Aurelien Marabelle, Clinical Director of the Cancer Immunotherapy Program at the Gustave Roussy Cancer Centre, Villejuif, France, said: "The study positions immunotherapy at an earlier stage of the disease history for patient with localised disease, and, interestingly, in the neo-adjuvant setting as opposed to the adjuvant setting that is now approved in melanoma and non-small-cell lung cancer."

Marabelle cautioned that the study was small, not randomised and there was no control arm of patients not treated with immunotherapy. He said: "Limited data are available but if they show complete pathological responses in the neoadjuvant setting, this therapeutic strategy might become standard of care for dMMR colorectal cancer." He added that dMMR tumours are more frequent in localised cancers (~15% of patients) than at the metastatic stage (~5%).

Marabelle considered that the finding of some activity with immunotherapy in pMMR tumours in early colon cancer was also potentially interesting. He said: "pMMR CRC does not usually respond to immunotherapy in the metastatic setting. If the researchers find that immunotherapy improves tumour shrinkage preoperatively or reduces post-surgery relapse in patients with pMMR early stage colon tumours, this treatment strategy might be of broader interest and impact a lot of patients because of the high frequency of colorectal cancer."
Notes to Editors

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This press release contains information provided by the authors of the highlighted abstracts and reflects the content of those abstracts. It does not necessarily reflect the views or opinions of ESMO who cannot be held responsible for the accuracy of the data. Commentators quoted in the press release are required to comply with the ESMO Declaration of Interests policy and the ESMO Code of Conduct.


  1. Abstract LBA37_PR 'Neoadjuvant ipilimumab plus nivolumab in early stage colon cancer' by Myriam Chalabi during the Proffered Paper Session on Monday 22 October, 11:15 to 12:45 (CEST) in Room 18 - Hall A2. Annals of Oncology, Volume 29 Supplement 8 October 2018
  2. Sclafani F. PD-1 inhibition in metastatic dMMR/MSI-H colorectal cancer. Lancet Oncology 2017; 18: 1141-1142

About the European Society for Medical Oncology (ESMO)

ESMO is the leading professional organisation for medical oncology. With 18,000 members representing oncology professionals from over 150 countries worldwide, ESMO is the society of reference for oncology education and information. ESMO is committed to offer the best care to people with cancer, through fostering integrated cancer care, supporting oncologists in their professional development, and advocating for sustainable cancer care worldwide.Visit

LBA37_PR - Neoadjuvant ipilimumab plus nivolumab in early stage colon cancer

M. Chalabi1, L.F. Fanchi2, J.G. Van den Berg3, G.L. Beets4, M. Lopez-Yurda5, A.G. Aalbers4, C. Grootscholten1, P. Snaebjornsson3, M. Maas6, M. Mertz7, E. Nuijten5, M. Kuiper1, M. Kok8, M.E. Van Leerdam1, T.N. Schumacher2, E.E. Voest1, J.B. Haanen8

1Gastrointestinal Oncology, Netherlands Cancer Institute, Amsterdam, Netherlands, 2Molecular Oncology and Immunology, Netherlands Cancer Institute, Amsterdam, Netherlands, 3Pathology, Netherlands Cancer Institute, Amsterdam, Netherlands, 4Surgical Oncology, Netherlands Cancer Institute, Amsterdam, Netherlands, 5Biometrics, Netherlands Cancer Institute, Amsterdam, Netherlands, 6Radiology, Netherlands Cancer Institute, Amsterdam, Netherlands, 7Bioimaging Facility, Netherlands Cancer Institute, Amsterdam, Netherlands, 8Medical Oncology, Netherlands Cancer Institute, Amsterdam, Netherlands

Background: Programmed death 1 (PD-1) and CTLA-4 blockade demonstrated durable clinical benefit in patients with advanced mismatch repair deficient (dMMR) colorectal cancer. This is the first neoadjuvant study to test ipilimumab (anti-CTLA-4) plus nivolumab (anti-PD1) in early stage dMMR and MMR proficient (pMMR) colon cancers (CC).

Methods: Patients with resectable, early stage CC received ipilimumab 1mg/kg on day (D)1 and nivolumab 3mg/kg on D1+15. Surgery was planned a maximum of 6 weeks after informed consent. Primary endpoints were safety and feasibility. Secondary endpoints included: efficacy assessed by pathological response criteria, and associations between response and tumor mutational burden (TMB), interferon (IFN)y gene signatures, T-cell infiltration and T-cell receptor (TCR) clonality.

Results: So far, 14 patients with either pMMR (n=8) or dMMR (n=7) tumors were treated. Treatment was well-tolerated and all patients underwent radical resection of 15 tumors without delays in surgery. Major pathological responses (<5% viable tumor cells) were observed in 7/7 (100%) dMMR CC, with 4/7 (57%) complete responses. Four of these dMMR tumors were clinically stage IIIB/C before start of treatment. Even though no major pathological responses were seen in pMMR tumors, significant increases in T-cell infiltration, particularly CD8+ T-cells, were seen post-treatment in both pMMR and dMMR tumors, with a median fold change of 2.4 (p=0.018) and 4.8 (p=0.0009), respectively. Strikingly, in spite of the major difference in TMB between dMMR and pMMR tumors (p=0.008), pre-treatment TCR clonality and IFN? gene signatures did not differ substantially between these tumors. In contrast, post-treatment IFN? signatures increased the ability to distinguish responders (dMMR) from non-responders (pMMR).

Conclusions: Short-term, neoadjuvant ipilimumab plus nivolumab resulted in major pathological responses in 100% of dMMR tumors and did not compromise surgery. While dMMR status and TMB were associated with response, pre-treatment measures of tumor inflammation may have limited predictive value. Our data suggest that neoadjuvant immunotherapy in dMMR CC warrants further research and has the potential to change the current standard of care.

Clinical trial identification: NCT03026140

Legal entity responsible for the study: Netherlands Cancer Institute

Funding: Bristol-Myers Squibb

Disclosure: All authors have declared no conflicts of interest

European Society for Medical Oncology

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