Trial reportSignal transduction and targeted therapy2026
Total neoadjuvant chemotherapy combined with PD‑1 blockade and IL‑2 in MSS/pMMR locally advanced rectal cancer: short-term results of a prospective, single-arm phase II study.
Trial report in Signal transduction and targeted therapy, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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10 authors.
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Abstract
Neoadjuvant therapy has become a cornerstone in the management of locally advanced rectal cancer (LARC). In this single-arm, open-label phase II study, we evaluated the efficacy and safety of total neoadjuvant chemotherapy (TNT) using a CapOX regimen combined with a programmed cell death protein 1 (PD‑1) antibody (sintilimab) and interleukin‑2 (IL‑2) in patients with microsatellite stable (MSS)/defining proficient mismatch repair (pMMR) LARC. A total of 33 patients, aged 18-75 years, with rectal tumors located within 12 cm from the anal verge and staged as cT3/4N_anyM0 or cT_anyN⁺M0, were enrolled. Patients received a regimen consisting of oxaliplatin, sintilimab, capecitabine, and IL‑2 administered in a three‑week cycle, with response evaluations performed after every two cycles. Following six cycles of treatment, 33 patients underwent radical surgery, achieving a 100% R0 resection rate. The pathological complete response (pCR) rate was 42.4% (95% CI: 25.68-59.16%) while the remaining 19 patients (57.6%, 95% CI: 41.07-74.09%) were assessed as having a partial response. The tumor regression grades (TRG) were, TRG1: 3 cases (9.1%, 95% CI: 1.90-25.97%), TRG2: 14 cases (42.4%, 95% CI: 26.27-60.38%), and TRG3: 2 cases (6.1%, 95% CI: 0.73-20.37%), respectively. Surgical safety reported as no cases of grade B/C anastomotic leakage or bowel obstruction. Adverse events (AEs) were manageable, with a 21.2% incidence of grade 3 events and no grade IV/V events or treatment‑related deaths. With a median follow‑up of 25.5 weeks, no recurrences were observed. Analysis of blood and tissue samples from patients with different treatment outcomes revealed significant activation of CD8
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