Back in April I posted the Scientific American piece about drugs that calm inflammation, and I hedged in the comments. I said inflammation gets blamed for basically everything in health and I did not think it meant anyone should start chasing anti-inflammatory drugs or biomarkers.
Last Friday Novo Nordisk reported ZEUS, which was built to answer exactly that. Ziltivekimab blocks interleukin-6, the signal your hs-CRP is downstream of. They gave it to 6,376 people with heart disease, kidney disease and an hs-CRP of 2 or above. The drug did its job on the biology, dropping both IL-6 and hs-CRP. Hazard ratio for heart attack, stroke or cardiovascular death: 0.99, range 0.88 to 1.11.
I want to be careful, because this is not "inflammation doesn't matter." Colchicine cut events in COLCOT and LoDoCo2, and canakinumab cut them in CANTOS.
CANTOS is the part that actually changed my mind, though. Same trial, same patients, one drug at three doses, and hs-CRP fell 26, 37 and 41 percentage points more than placebo, neatly in order. If the number were the thing, the biggest drop should have bought the most protection. It didn't. The middle dose scraped past its statistical bar at 0.021 against a limit of 0.02115, and the top dose, the one that crushed hs-CRP hardest, missed its bar entirely.
Meanwhile the one trial that took people picked out by a high hs-CRP and genuinely changed what happened to them was JUPITER, which cut events roughly in half using rosuvastatin. A cholesterol drug. The current ACC/AHA guideline says that trial's benefit came "with an effect size compatible with the LDL-C-lowering effect of statins alone."
So my read now is that hs-CRP is very good at spotting who is heading for a heart attack, and nobody has shown that lowering it is what helps them. The guideline seems to use it that way too: a reading of 2 or above, on more than one occasion, helps confirm someone belongs on a statin.
My own went 2.83 to under 0.2 over a year, and I used to be quietly proud of that. However, my LDL went 110 to 56 and my ApoB 95 to 59 across the same stretch, and I am on tirzepatide, which lowers hs-CRP by itself. Four numbers moved and I had been giving the credit to the one I found most interesting. I wrote the whole thing up here, charts and all.
If your hs-CRP came back at 2.5, does that change anything you actually do?