⚡️ BREAKTHROUGH OR JUST BARELY THERE?
#METIS Ph. 3 RCT presented at
#ASTRO25 Plenary earlier this week (Tumor Treating Fields, TTF, after SRS for
#lungcancer brain mets) revealed TTF significantly delayed intracranial progression ✅
But when you dig into the results - especially the study appendix - the story isn’t so simple 👇
Just finished reading the full METIS manuscript appendix (PMID: 41033612) published in
@IJROBP
First, HUGE thank you and congrats to the authors on completing this landmark study 👏
📌 Quick refresher on study design/results
• Phase III, 298 pts
• Open-label, randomized 1:1
• TTF SRS ⚡ vs SRS alone 🎯
• Primary endpoint = Time to Intracranial Progression (TTIP) ⏱
• Median follow-up = 8.6 mo
• ✅️ TTF significantly delayed TTIP (HR 0.72, p=0.044) → ~28% ↓ risk of intracranial progression
• Side effect profile favorable, mostly grade 1–2
Sounds encouraging, right? Well… let’s look closer 👀
🧩 What exactly was TTIP?
A composite of 4 components:
1️⃣ Local progression
2️⃣ Clinical worsening
3️⃣ Neurologic death
4️⃣ Distant progression
📑 Now, here is the catch (Figure S3 in the appendix):
👉 NONE of the 4 components were individually significant ❌
Local progression NS ❌ (HR 0.82, p=0.44)
Clinical worsening NS ❌ (HR 1.04, p=0.96)
Neurologic death NS ❌ (HR 1.02, p=0.69)
Distant progression NS ❌ (HR 0.76, p=0.17)
⚠️ The “win” came only from combining 4 components, none of which were statistically significant on their own.
🧐 But how about secondary endpoints?
There is some good news there, right?
Well… not quite 😬
OS 💀 = negative
Cognition 🧠 = negative
QoL 📉 = negative
So the entire “positive” signal rests on the composite itself, leaving open the question of whether this reflects true clinical benefit for patients...
🙌 Final thoughts:
I’m glad we now have another potential option for
#lungcancer brain metastases🌟
Huge respect to the METIS investigators 👏 - pulling off such a massive Phase 3 trial in this space is an enormous achievement 💪
But with no OS benefit and TTIP met only by pooling 4 non-significant components and right at the 0.05 threshold, one may wonder if this intervention actually translates into meaningful patient benefit, or if the signal is more statistical than clinical...
Curious what others think ⬇️
And regardless - credit where it’s due 🙏: this is still an important new treatment tool, and pulling off METIS was a milestone worth celebrating 👏🌍⚡
#radonc #TTF #Optune #Novocure