IOBT presenterer hode/nakke på ESMO og viser til ORR på 43% (Edit: skrev først 80% som var for Melanoma og dermed feil) sammenlignet med 23% for Keynote-048. Merk at dette er for CPS >=20% i begge tilfellene. Også PFS er bedre mot historisk sammenligning. Men lav N osv.
En liten ting jeg merker meg er at ikke meldes noen plass når abstraktet slippes (selv om det inneholder data) slik som praksis virker å være på OSE. Vet ikke om dette er en “USA greie”?
Background
Pembrolizumab monotherapy is approved for 1L PD-L1-positive (CPS ≥1%) recurrent/metastatic SCCHN; objective response rate (ORR) is low even in PD-L1-high (CPS ≥20%); (KEYNOTE-048; 23%). IO102-IO103 investigational vaccine targets tumor cells and immune-suppressive cells in the tumor microenvironment by potentiating anti-tumor activity via activation and expansion of T cells against indoleamine 2,3-dioxygenase 1 (IDO1) and PD-L1 positive cells. Combination of IO102-IO103/nivolumab in a phase 1/2 trial of anti-PD-1 naïve metastatic melanoma patients (pts) showed 80% ORR (50% complete response); was well tolerated, providing rationale for testing IO102-IO103/anti-PD-1 in 1L SCCHN. IO102-IO103/pembrolizumab is also under investigation for resectable SCCHN and melanoma; a phase 3 registration trial in advanced 1L melanoma is fully enrolled.
Methods
This phase 2, non-comparative, open-label, multi-centre, multi-cohort trial enrolled SCCHN pts with PD-L1 CPS ≥20%, any HPV status, and no prior systemic treatment for recurrent/metastatic disease. Pts received 3-week cycles of subcutaneous IO102-IO103 (85-85 μg on Day [D] 1 and 8 of Cycle 1 and 2, then D1 only) plus pembrolizumab (200 mg on D1) for ≤2 years. Primary endpoint was ORR by RECIST 1.1, with secondary endpoints including progression-free survival (PFS) and safety.
Results
At data cut-off (Apr 1, 2024), of 21 pts enrolled, one was ineligible and 18 had received ≥2 cycles of treatment and were considered evaluable for efficacy. Eight pts had a confirmed partial response (ORR 44%), four pts (22%) had stable disease and 6 (33%) had progressive disease. PFS at 6 months was 55.5% with two pts censored for <6 months follow-up. Treatment-related adverse events of any grade occurred in 15 of 21 pts (71.4%) including 3 (14.3%) grade ≥3 and none being serious, fatigue was most commonly reported (n=4; 19.0%).
Conclusions
IO102-IO103/pembrolizumab shows encouraging clinical activity for 1L treatment of PD-L1 high SCCHN. The combination is tolerable, with no unexpected safety signals. Updated ORR analysis, PFS, and exploratory biomarkers will be presented at the meeting.