Marc Voigt, CEO of Immutep, stated, “The overall survival and progression-free survival data from this mature cohort of patients in INSIGHT-003 with nearly a 2-year minimum follow-up exceeds our expectations. We are encouraged to see efti build upon the historical clinical outcomes from the most widely used immunotherapy-chemo combination today. Additionally, the early evaluations in the expansion cohort of 19 patients, who all have low or negative PD-L1 expression, are tracking well and we look forward to additional data updates from the INSIGHT-003 trial in 2025 and beyond. Our focus on potentially driving a new standard of care globally in first line treatment of NSCLC is boosted by these results and we are well advanced in our preparations to initiate the TACTI-004 Phase III trial.”
Data from all evaluable patients to date (N=40) demonstrates significant improvement of Overall Response Rate (ORR) according to RECIST 1.1 across all levels of PD-L1 expression compared to historical control2:
| | • | | 75.0% ORR versus 62.1% ORR in patients with high PD-L1 expression (TPS >50%) |
| | • | | 58.8% ORR versus 49.2% ORR in patients with low PD-L1 expression (TPS 1-49%) |
| | • | | 47.4% ORR versus 32.3% ORR in patients with negative PD-L1 expression (TPS <1%) |
In this all-comer PD-L1 trial, the 55.0% ORR and 87.5% Disease Control Rate (DCR) are from the following breakdown of patients by PD-L1 expression: TPS >50% (N=4), TPS 1-49% (N=17), and TPS <1% (N=19). As compared to the general 1L NSCLC patient population of which each of these PD-L1 levels represents roughly one-third, INSIGHT-003 is biased towards low and negative PD-L1 (TPS <50%) patients who are typically less responsive to anti-PD-1 therapy.
In these patients with low and negative PD-L1 expression (36 of 40 patients), the triple combination achieved a 52.8% ORR and 86.1% DCR. Of note, all 19 patients in the expansion cohort have TPS <50% and several with stable disease have potential to become responders.
Safety
Safety continues to be favourable for efti in combination with pembrolizumab and chemotherapy, with no new safety signals.
Next Steps
INSIGHT-003, a multi-centre study led by the Frankfurt Institute of Clinical Cancer Research IKF, is nearing completion of patient enrolment. Additional data updates from this trial are expected in 2025 and beyond.
About INSIGHT-003
INSIGHT-003 is an investigator-initiated, multi-centre study led by the Frankfurt Institute of Clinical Cancer Research (IKF). It is being run as the third arm (Stratum C) of the ongoing Phase I INSIGHT trial with Prof. Dr. Salah-Eddin Al-Batran as lead investigator. The study is evaluating a triple combination therapy in front line non-small cell lung cancer patients consisting of efti administered subcutaneously in conjunction with an existing approved standard-of-care combination of anti-PD-1 therapy (pembrolizumab) and doublet chemotherapy (carboplatin and pemetrexed) delivered intravenously. The trial will assess the safety, tolerability, and initial efficacy of the combination.
