January 2024

Why receptor selectivity is the least discussed number in incretin pharmacology

Selectivity, potency and efficacy are three different measurements. The trade routinely reports none of them.

Albumin, fatty-acid chains, and the engineering that made a weekly incretin possible

The molecular engineering that turned a peptide with a two-minute half-life into a once-weekly drug.

Target dose, effective dose, and the distance between them

Two withdrawal-design trials tell us what happens when treatment stops. Neither tells us what the lowest effective maintenance…

Stepping down is part of titration

The practice is near-universal, clinically sensible, and supported by observational data rather than randomised comparison. We…

The eighteenth month, and the conversation that should have happened in the third

Weight reduction in the long programmes flattens at roughly sixty to seventy-two weeks. The timing is consistent, predictable…

Forty-four per cent: reading the nausea figure properly

Trial adverse-event tables count episodes reported to a study nurse. They are the best data we have and they systematically…

Background rates, and why they matter for attribution

The features that should prompt urgent assessment, stated once and plainly.

The tolerability data everybody quotes and nobody reads

Almost every figure in circulation about tolerability comes from six publications. This is what they say.

How a claim degrades between the bench and the listing

The Journal does not treat a badge as evidence and states so wherever it reports one.

The certificate says 2024. The vial in your hand does not say anything.

The interval between manufacture and analysis is the most under-read figure on the page, and the one most likely to matter by…

Retest date, expiry date, and the two conventions being confused

A document is only as good as the chain that connects it to the material, and most chains here are two or three links longer…

What twenty companies say about storage, and what they have measured

A retest date says that material should be re-examined before use. An expiry date says it should not be used. The trade uses the…

Two documents, two disciplines: purity and sterility are not the same trade

Every certificate circulating in this market answers a question about molecules. Almost none answers a question about organisms,…

From vial to bench: what is recorded and what is assumed

Chain of custody, in a regulated setting, begins at sampling. Here it begins when the package arrives.

Everything on the page, in the order a chemist would read it

Nothing on this page is difficult. It is simply unfamiliar, and unfamiliarity is what makes a weak certificate look like a…

A tested vial is evidence about a vial

A result on one vial generalises to a batch only if the vial was drawn in a way that makes it representative — and nobody…

What happens when the drug is taken away: three randomised answers

Three randomised withdrawal designs have tested what happens when treatment stops. Their results are consistent and they are…

Why the bone question is harder than the muscle question

Weight loss reduces bone mineral density at load-bearing sites. Whether that translates into fractures in this population is…

Seasonal use, holiday use, and the honest state of the evidence

A great deal of practice has grown up around intermittent schedules. The randomised evidence for any of them is, as far as the…

What the older diet-and-exercise trials found in the hip

A plausible mechanism, a measurable change, and no outcome data. This is what an open question looks like.

Continuous monitoring changed the question and not the assay

HbA1c integrates roughly three months of glycaemia with the most recent weeks weighted most heavily. Almost every misreading of…

The glycated haemoglobin assay, and the eight conditions that break it

The assay is not the problem. The interpretation of a lagging integral as a current measurement is the problem.

Stepping down against stopping: two decisions treated as one

These agents produce no dependence and no withdrawal syndrome. What a taper would be for is therefore a real question rather…

A design note on withdrawal trials, and why the run-in matters

A withdrawal trial answers a narrower question than it appears to. This piece states which question.

The badge is about a sample. The listing is about a product.

The Journal does not treat a badge as evidence and states so wherever it reports one.

Mass spectrometry answers a different question, properly

Where two methods disagree, the conservative convention is to report the lower figure. It is not universal, and whether a…

A named analyst is the cheapest quality signal in this trade

What the Journal asks when a document arrives unsigned, and what the answers have been.

The submitted sample: the weakest link in the whole system

Every third-party report in this market describes a sample somebody chose to send. That choice is outside the laboratory’s…

Low endotoxin recovery: the interference nobody looks for

We submitted vials for endotoxin determination and report the results, the method and the laboratory, because a pyrogen figure…

What the paperwork is for, and who it was designed to protect

The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are…

Why PeptideMeter may run electrospray where another laboratory runs MALDI

A brief and unromantic tour of the interface between a liquid sample and a vacuum.

What twenty companies say about storage, and what they have measured

What would make a difference is not a regulator. It is three lines on a certificate, all of which are already known to whoever…

A guide to the results that will resolve themselves

The panel drawn during a week of vomiting is measuring the vomiting.

Dose-limiting: a definition worth being strict about

Roughly four to seven per cent of trial participants discontinued for adverse events, mostly gastrointestinal, mostly during…

What has to change before a change has happened

A flag is a probability statement about a population. It is not a statement about the person holding the printout.

What a 1 mL syringe does that a 0.3 mL syringe does not

Dead space in the needle hub is a real and calculable loss, and it matters more at small volumes than anybody expects.

Pancreatitis, obstruction, gallbladder: three things nausea can be

Pancreatitis is rare, was adjudicated in the outcome programmes, and did not show the imbalance early case reports suggested.

What STEP 4 and SURMOUNT-4 actually established

Two withdrawal-design trials tell us what happens when treatment stops. Neither tells us what the lowest effective maintenance…

What a 1 mL syringe does that a 0.3 mL syringe does not

A unit is a volume. A dose is a mass. The bridge between them is concentration, and concentration is a number somebody has to…

Six words a verification badge would need to mean anything

Lot-level verification with a public report is a real and achievable thing. It exists in this market, on a minority of listings.

Why people actually stop, in the order they actually stop

Cost is the modal reason for discontinuation in every dataset we have seen, and it is absent from the clinical literature.

The badge economy, and what it is actually certifying

A badge asserts that something was tested. It does not assert what, when, on whose sample, by what method, or whether the lot on…

Sending the same vial twice, under two names

Two years ago we ran an anonymised version of this comparison and promised a named one. This is it, with every method printed in…

The shortage years, and what they taught about interruption

Real-world persistence figures, with their definitions stated, because the definitions are doing most of the work.

The dose that got you here and the dose that keeps you here

The commonest real-world strategy in this drug class is the least studied one.

The submitted sample: the weakest link in the whole system

What a laboratory can and cannot know about the provenance, storage history and representativeness of what lands on its bench.

Units, millilitres, milligrams: three scales on one small object

A unit is a volume. A dose is a mass. The bridge between them is concentration, and concentration is a number somebody has to…

Site selection when the tissue has already changed

A rotation scheme that is too complicated will not be followed. We describe the simple ones that are.

Lipohypertrophy, and the absorption it ruins

A rotation scheme that is too complicated will not be followed. We describe the simple ones that are.

What “LC-MS: conforms” tells a reader, which is almost nothing

A short audit procedure, usable by anyone holding a certificate and a calculator.

D-amino acids are invisible to mass spectrometry, and that is the whole problem

Stereochemical inversion changes the molecule, changes its biology, and changes its mass by exactly nothing.

How to read the silence on a certificate you already hold

Our position is about documentation practice. It is not an allegation about anybody’s honesty, and we are explicit about the…

Why a 0.036-dalton difference is the hardest number in peptide identity

Parts per million sound impressive until they are converted into daltons at the molecular weight of the thing being measured.

The impurity hiding underneath the parent peak

An orthogonal method separates on a different physical principle, so that species co-eluting in the first are likely to resolve…

Resolving power and mass accuracy are two different specifications

Every instrument specification quoted in an advertisement is a best case obtained on a calibration mixture, not on a submitted…

Deamidation, oxidation, and the two shifts worth memorising

What would be needed to catch each of these, and what it would cost.

A percentage is not a specification

Chromatographic purity is cheap, fast and comparable-looking. Those three properties, and not its usefulness, explain why it…

What orthogonal actually means, and what it does not

The most useful single addition to any purity determination is a second separation under a different pH or on a different…

A needle is a single-use instrument

A needle blunts on first use. Reuse is uncomfortable, and it is a documented contributor to lipohypertrophy.

Attribution is the hard part

We give background rates alongside trial rates, because an event occurring during treatment is not thereby caused by it.