Abstract:
:PD-1 plus CTLA-4 blockade is highly effective in advanced-stage, mismatch repair (MMR)-deficient (dMMR) colorectal cancers, yet not in MMR-proficient (pMMR) tumors. We postulated a higher efficacy of neoadjuvant immunotherapy in early-stage colon cancers. In the exploratory NICHE study (ClinicalTrials.gov: NCT03026140), patients with dMMR or pMMR tumors received a single dose of ipilimumab and two doses of nivolumab before surgery, the pMMR group with or without celecoxib. The primary objective was safety and feasibility; 40 patients with 21 dMMR and 20 pMMR tumors were treated, and 3 patients received nivolumab monotherapy in the safety run-in. Treatment was well tolerated and all patients underwent radical resections without delays, meeting the primary endpoint. Of the patients who received ipilimumab + nivolumab (20 dMMR and 15 pMMR tumors), 35 were evaluable for efficacy and translational endpoints. Pathological response was observed in 20/20 (100%; 95% exact confidence interval (CI): 86-100%) dMMR tumors, with 19 major pathological responses (MPRs, ≤10% residual viable tumor) and 12 pathological complete responses. In pMMR tumors, 4/15 (27%; 95% exact CI: 8-55%) showed pathological responses, with 3 MPRs and 1 partial response. CD8+PD-1+ T cell infiltration was predictive of response in pMMR tumors. These data indicate that neoadjuvant immunotherapy may have the potential to become the standard of care for a defined group of colon cancer patients when validated in larger studies with at least 3 years of disease-free survival data.
journal_name
Nat Medjournal_title
Nature medicineauthors
Chalabi M,Fanchi LF,Dijkstra KK,Van den Berg JG,Aalbers AG,Sikorska K,Lopez-Yurda M,Grootscholten C,Beets GL,Snaebjornsson P,Maas M,Mertz M,Veninga V,Bounova G,Broeks A,Beets-Tan RG,de Wijkerslooth TR,van Lent AU,Marsdoi
10.1038/s41591-020-0805-8subject
Has Abstractpub_date
2020-04-01 00:00:00pages
566-576issue
4eissn
1078-8956issn
1546-170Xpii
10.1038/s41591-020-0805-8journal_volume
26pub_type
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