Tiene razón en el diseño: Lp(a)HORIZON randomizó un grifo y dejó el de ApoB fijo en los dos brazos, así que ese resultado negativo no dice nada sobre el modelo de partículas en su conjunto. Pero el desagüe no es un solo caño: hay una salida segura, el receptor de LDL (LDLR), que recicla la partícula en el hígado, y una salida patológica, los receptores scavenger de macrófagos y del endotelio (como LOX-1), que solo entran a tallar cuando la partícula ya llegó modificada, y no la reciclan, la atrapan. Por cuál sale cada partícula depende de cuánto tiempo lleva circulando y en qué estado químico llega, y eso no lo fija solo la genética, lo fija el ambiente metabólico: glucemia, inflamación, tabaco, uremia, sueño, entrenamiento. Al modelo clásico no le falta un dato, le falta una pata: cuenta partículas y mira el subendotelio, pero nunca mide el ambiente que las va modificando mientras circulan.
Cuanto más tiempo circula una partícula, más se modifica (glicación, oxidación, carbamilación) hasta que el LDLR deja de reconocerla y termina saliendo por la vía scavenger, que no recicla, inflama: activa LOX-1, sube PCSK9, baja el LDLR disponible para el resto de las partículas, un circuito que se retroalimenta. Por eso diálisis, con ApoB normal, tiene 10 a 20 veces más riesgo cardiovascular y las estatinas no bajan eventos ahí: el LDLR funciona bien, el problema es que el ligando ya llegó dañado por la uremia y sale por la otra puerta. Marco completo, hipótesis con predicciones falsables:
doi.org/10.3389/fcvm.2026.18…
Fair point on design: Lp(a)HORIZON randomized one faucet while ApoB stayed fixed in both arms, so a null there says nothing about the particle model as a whole. But the drain isn't one pipe: there's a safe exit, the LDL receptor (LDLR), which recycles the particle in the liver, and a pathological exit, scavenger receptors on macrophages and the endothelium (like LOX-1), which only kick in once the particle is already modified, and don't recycle it, they trap it. Which exit a particle takes depends on how long it's been circulating and what chemical state it's in when it gets there, and that's not set by genetics alone, it's set by the metabolic environment: glucose control, inflammation, smoking, uremia, sleep, training load. The classic model isn't missing a data point, it's missing a leg: it counts particles and looks at the subendothelium, but never measures the environment modifying them while they circulate.
The longer a particle circulates, the more it gets modified (glycation, oxidation, carbamylation) until the LDLR stops recognizing it and it exits through the scavenger route instead, which doesn't recycle, it inflames: activates LOX-1, upregulates PCSK9, lowers the LDLR available for every other particle still circulating, a feedback loop. That's why dialysis patients, with normal ApoB, carry 10 to 20x the cardiovascular risk, and statins don't reduce events there: the LDLR works fine, the ligand already arrived damaged by uremia and exits through the other door. Full framework, hypothesis with falsifiable predictions:
doi.org/10.3389/fcvm.2026.18…So why are all keto zealots crawling from under their rocks declaring "lipid hypothesis is dead!" after the Lp(a) HORIZON readout?
Let's find out.
Both arms of Lp(a)HORIZON were on optimized lipid-lowering therapy. The trial randomized one thing on top of that, and the thing it randomized was Lp(a).
Classic conflation.
An exposure held constant in both groups is an exposure the trial cannot speak to. What it asked was whether stripping Lp(a) out adds anything once the rest of the particle burden is already being treated, across 8,323 patients with established disease.
On the primary endpoint the answer was no. That is a finding about Lp(a), and about pelacarsen, and about nothing else.
The design says as much itself. All 8,323 entered with Lp(a) at or above 70 mg/dL, and the trial was powered on a Mendelian randomization estimate that an absolute reduction of 70 to 90 mg/dL would be needed to buy what 1 mmol/L of LDL-C lowering buys. The benchmark written into the protocol is the particle model. It was built on that model rather than against it.
For all 8,323 of those patients, Novartis and Ionis released no event rates, no hazard ratios and no p-values. Anyone explaining why it missed is explaining something the sponsors have not published.
The question people are now calling "open" has 26 randomized trials and 170,000 participants behind it, and the genetics underneath that. None of it moved on Wednesday.
@ProfDFrancis, is that how a trialist reads a null on a second exposure?
Your own ApoB sat outside the randomization entirely. It remains the number to ask for by name, and where you cannot get it, total cholesterol minus HDL-C gives you non-HDL-C from the panel you already hold.
Never give up. Never surrender.