Every letter we have printed
Page 53 of 77 of this archive, newest first.
On “Non-responders, and the honest state of the evidence about them” — Explainers, 28 Oct 2024
A small thing: you write "class B GPCR" and then "secretin-like receptor" as though these were different classifications. They are the same family under two naming conventions, and the piece would be clearer if it said so.
— H. Nakagawa, Fukuoka
Fair, and now stated in the text.
On “Non-responders, and the honest state of the evidence about them” — Explainers, 28 Oct 2024
You describe biased agonism as "legitimate and probably important" and then decline to say which molecules are biased in which direction. That is a strange place to stop.
— G. Kalinowski, Poznań
It is, and it is deliberate. The published bias factors for these ligands are measured in different systems and are not comparable to one another. We would rather stop than publish a ranking that the underlying assays cannot support.
On “The dose that got you here and the dose that keeps you here” — The Ledger, 26 Oct 2024
Your piece describes tapering as pharmacologically pointless and then spends three paragraphs making a case for it. Pick one.
— A. Basaraba, Winnipeg, MB
Both, we think, and deliberately. There is no pharmacological rationale, because there is no withdrawal syndrome and a week-long half-life produces its own decline. There is a behavioural rationale, which is different in kind and untested. Our objection is to tapers advocated in pharmacological language, not to the practice.
On “The dose that got you here and the dose that keeps you here” — The Ledger, 26 Oct 2024
I lost access for eleven weeks during the shortage, restarted at the dose I had been on because nobody told me otherwise, and spent a fortnight unable to keep food down. I had been on that dose for seven months without difficulty. Reading your resumption section was the first time anybody explained it.
— P. McAlinden, Belfast
It is entirely predictable from the label and the pharmacokinetics, and the failure to communicate it during the shortage period was systemic rather than individual. We are sorry it reached you this way and we are glad it reached you.
On “The dose that got you here and the dose that keeps you here” — The Ledger, 26 Oct 2024
You describe the maintenance strategy of stepping down one dose and holding for eight to twelve weeks as something clinicians report doing, and then say it is not a recommendation. That distinction will be lost on most readers, and printing the protocol makes you a source for it whether you intend to be or not.
— D. Chukwuma, Onitsha
This is the hardest editorial question this department faces and we do not think you are wrong. Our position is that a practice this widespread is better described accurately, with its evidentiary status stated, than left to circulate in fragments. We accept that the distinction does work that a reader may not do.
On “What SURPASS-4 tells us about maintenance, and what it does not” — Clinical Trials, 25 Oct 2024
Your piece describes tapering as pharmacologically pointless and then spends three paragraphs making a case for it. Pick one.
— P. Sandoval, Albuquerque, NM
Both, we think, and deliberately. There is no pharmacological rationale, because there is no withdrawal syndrome and a week-long half-life produces its own decline. There is a behavioural rationale, which is different in kind and untested. Our objection is to tapers advocated in pharmacological language, not to the practice.
On “What SURPASS-4 tells us about maintenance, and what it does not” — Clinical Trials, 25 Oct 2024
I lost access for eleven weeks during the shortage, restarted at the dose I had been on because nobody told me otherwise, and spent a fortnight unable to keep food down. I had been on that dose for seven months without difficulty. Reading your resumption section was the first time anybody explained it.
— Q. Delacroix, Montréal, QC
It is entirely predictable from the label and the pharmacokinetics, and the failure to communicate it during the shortage period was systemic rather than individual. We are sorry it reached you this way and we are glad it reached you.
On “What SURPASS-4 tells us about maintenance, and what it does not” — Clinical Trials, 25 Oct 2024
You describe the maintenance strategy of stepping down one dose and holding for eight to twelve weeks as something clinicians report doing, and then say it is not a recommendation. That distinction will be lost on most readers, and printing the protocol makes you a source for it whether you intend to be or not.
— S. Weatherall, Newcastle, NSW
This is the hardest editorial question this department faces and we do not think you are wrong. Our position is that a practice this widespread is better described accurately, with its evidentiary status stated, than left to circulate in fragments. We accept that the distinction does work that a reader may not do.
On “Why your endoscopist wants to know about your injection” — Pharmacology, 24 Oct 2024
You note that symptom burden does not predict weight outcome. This is the single most useful sentence I have read about this treatment. I spent four months believing that feeling well meant it was not working and considered increasing my dose on that basis alone.
— J. Vasilenko, Chisinau
The folk model that suffering indexes efficacy is widespread and the published analyses do not support it. It is also actively harmful when it drives escalation, which is why we gave it a line in the closing section rather than burying it in the tables.
On “Why your endoscopist wants to know about your injection” — Pharmacology, 24 Oct 2024
Your incidence tables are from the licensed products. I use compounded material at a concentration that does not match any pen. Are the figures transferable at all?
— K. Sivertsen, Bergen
The mechanism transfers; the incidence figures transfer only to the extent that your actual exposure matches the trial exposure, which is unknown unless the content has been measured. That is not evasion. It is the reason we argue for peptide content as a standard reported field rather than purity alone.
On “Why your endoscopist wants to know about your injection” — Pharmacology, 24 Oct 2024
A small point of precision. You use "gastroparesis" in the tag list and then spend a paragraph saying it is not a synonym for drug-induced emptying delay. That is a slightly awkward position to hold.
— S. Bergqvist, Malmö
It is, and it is a compromise with how readers search. The tag exists because that is the word people use; the glossary exists because it is the wrong one. We would rather be findable and then precise than precise and unread.
On “Why your endoscopist wants to know about your injection” — Pharmacology, 24 Oct 2024
Nothing in your file addresses the social dimension, which for me was worse than the nausea. Six months of declining invitations to meals, and explaining to family why I was not eating. The tables do not have a row for that.
— T. Oyelowo, Abeokuta
On “GIP was a failed target for thirty years. Then it was not.” — Explainers, 23 Oct 2024
I have read three separate articles this month describing cagrilintide as a GLP-1 agonist and one describing tirzepatide as "semaglutide with an extra bit". Thank you for the glossary. Please run it again.
— D. Sakamoto, Kobe
On “GIP was a failed target for thirty years. Then it was not.” — Explainers, 23 Oct 2024
The claim that nothing at baseline predicts response is too strong. Surely baseline BMI, sex and diabetes status shift the expected outcome — the trials stratify on exactly those variables.
— C. Bąkowski, Łódź
They shift the mean, which is why the trials stratify. They barely narrow the distribution around it, which is the claim we made. Both statements are in the responder analyses and we should have distinguished them more carefully in the paragraph you are objecting to.
On “GIP was a failed target for thirty years. Then it was not.” — Explainers, 23 Oct 2024
Your table lists orforglipron with a half-life of 29 to 49 hours. That is a wide range to report as a single figure. What accounts for it?
— A. Kirkbride, Leeds
Dose and study population, mostly. We should have given the two bounding studies rather than a range with no attribution, and the table has been amended.
On “GIP was a failed target for thirty years. Then it was not.” — Explainers, 23 Oct 2024
Your piece states that moving the injection day does not change total exposure, and I accept the arithmetic, but I want to record that it changed my experience considerably. I moved from Monday morning to Thursday evening and the two worst days now fall on a weekend. The drug is doing the same thing; my week is not.
— R. Ekwueme, Awka
This is exactly the distinction we were trying to draw and evidently drew badly. Total exposure is unchanged; the phase relationship between peak concentration and your working week is not. We have added a sentence to that effect.
On “The retest date and the expiry date are not the same document” — Analytics, 21 Oct 2024
Eleven days in customs, and you describe it as a structural feature rather than a scandal. Why the restraint? A shipper advertising a cold chain that demonstrably does not survive a routine examination is making a claim it cannot support.
— J. Costanzo, Naples
The restraint is about where the fault lies. Customs authorities are performing a lawful function and owe nobody a thermal record. The claim of end-to-end control is the thing we criticise, and we do criticise it, in the article and again in the closing. What we will not do is convert an unavoidable feature of international freight into an allegation against the shipper who could not see it either.
On “The retest date and the expiry date are not the same document” — Analytics, 21 Oct 2024
Your section on freezing reconstituted solution stops short of the obvious question, which I will therefore ask. If a phosphate buffer shifts pH substantially on freezing, does that not mean the freezer is actively worse than the refrigerator for a buffered formulation, rather than merely unproven?
— E. Nkomo, Polokwane
For a phosphate-buffered formulation, plausibly yes, and the mechanism is well documented. We stopped short because the magnitude is formulation-specific and because most reconstituted research vials are in unbuffered water or bacteriostatic water, where the argument is about the interface rather than about pH. We should have made that distinction in the text instead of leaving a gap for you to find.
On “The retest date and the expiry date are not the same document” — Analytics, 21 Oct 2024
You draw a distinction between retest date and expiry date and then say suppliers use the wrong word. Which word do you think they should use, given that most of them have no study behind either?
— G. Rasmussen, Odense
Retest, with a stated interval and a note that no formal stability study supports it. That is an honest description of a chemical supplier’s position and it is standard practice in the wider chemical trade. Printing expiry implies a study exists, which is the specific inference we object to.
On “The shelf life ends when the diluent goes in” — Analytics, 21 Oct 2024
Eleven days in customs, and you describe it as a structural feature rather than a scandal. Why the restraint? A shipper advertising a cold chain that demonstrably does not survive a routine examination is making a claim it cannot support.
— N. Fairweather, Hamilton
The restraint is about where the fault lies. Customs authorities are performing a lawful function and owe nobody a thermal record. The claim of end-to-end control is the thing we criticise, and we do criticise it, in the article and again in the closing. What we will not do is convert an unavoidable feature of international freight into an allegation against the shipper who could not see it either.
On “The shelf life ends when the diluent goes in” — Analytics, 21 Oct 2024
Your section on freezing reconstituted solution stops short of the obvious question, which I will therefore ask. If a phosphate buffer shifts pH substantially on freezing, does that not mean the freezer is actively worse than the refrigerator for a buffered formulation, rather than merely unproven?
— M. Karlsen, Kristiansand
For a phosphate-buffered formulation, plausibly yes, and the mechanism is well documented. We stopped short because the magnitude is formulation-specific and because most reconstituted research vials are in unbuffered water or bacteriostatic water, where the argument is about the interface rather than about pH. We should have made that distinction in the text instead of leaving a gap for you to find.
On “The shelf life ends when the diluent goes in” — Analytics, 21 Oct 2024
You draw a distinction between retest date and expiry date and then say suppliers use the wrong word. Which word do you think they should use, given that most of them have no study behind either?
— O. Brannigan, Galway
Retest, with a stated interval and a note that no formal stability study supports it. That is an honest description of a chemical supplier’s position and it is standard practice in the wider chemical trade. Printing expiry implies a study exists, which is the specific inference we object to.
On “The mechanism behind the mechanism” — Pharmacology, 19 Oct 2024
The gallbladder section says some of the excess is attributable to weight loss rather than the drug. If the drug causes the weight loss, is that not a distinction without a difference for the person who ends up in theatre?
— B. Tejeda, Santo Domingo
For the individual, largely yes. For the question of whether one molecule is safer than another, or whether the risk would fall on slower loss, the distinction is the whole question. We should have made clear that it is a mechanistic distinction rather than a consoling one.
On “The mechanism behind the mechanism” — Pharmacology, 19 Oct 2024
As an anaesthetist I read the perioperative section with interest and one objection. You frame disclosure as the patient obligation. In my experience the failure is more often ours: the pre-assessment questionnaire in my own institution did not include these drugs until eighteen months after the first guidance appeared.
— B. Wojciechowski, Kraków
A fair correction and we have amended the text. If the question is not on the form, the absence of an answer is not a patient failure. We would be interested to hear from readers in other institutions about whether their pre-assessment documentation has caught up.
On “The mechanism behind the mechanism” — Pharmacology, 19 Oct 2024
Your incidence tables are from the licensed products. I use compounded material at a concentration that does not match any pen. Are the figures transferable at all?
— W. Stroud, Chattanooga, TN
The mechanism transfers; the incidence figures transfer only to the extent that your actual exposure matches the trial exposure, which is unknown unless the content has been measured. That is not evasion. It is the reason we argue for peptide content as a standard reported field rather than purity alone.
On “Asparagine, glycine, and the two residues that decide a shelf life” — The Supply Chain, 19 Oct 2024
I have shipped temperature-sensitive material commercially for eleven years and your coolant arithmetic is right but generous. You assume the pack starts fully frozen. In practice packs are pulled from a freezer that is opened forty times a day, and a pack that starts at minus four with a soft core has lost a fair share of its budget before the box is closed.
— B. Wojciechowski, Kraków
A good point and one we had not considered properly. The latent heat calculation assumes a fully solid pack at its melting point, and a partially thawed pack is exactly as much worse as the missing solid fraction. We have added a sentence and would welcome any data you can share on pack condition at packing.
On “Asparagine, glycine, and the two residues that decide a shelf life” — The Supply Chain, 19 Oct 2024
You say no company reports residual moisture. I obtained a figure from a supplier last year without difficulty, on request, so the data exists in at least some cases. The problem may be less that it is not measured than that it is not printed.
— B. Tejeda, Santo Domingo
On “Asparagine, glycine, and the two residues that decide a shelf life” — The Supply Chain, 19 Oct 2024
The mean kinetic temperature explanation is the clearest I have read anywhere, including in the training my employer paid for. I have printed the sidebar and put it on the wall of the dispatch room.
— R. Devaney, Ballarat, VIC
On “Asparagine, glycine, and the two residues that decide a shelf life” — The Supply Chain, 19 Oct 2024
Your table of degradation pathways lists racemisation and then says it is essentially never reported. If it is never reported, on what basis do you list it as a real risk rather than a theoretical one?
— W. Stroud, Chattanooga, TN
On the basis of the synthesis and analytical literature, where epimer formation during solid-phase assembly and during storage at extremes of pH is well characterised. What is missing is not evidence that it occurs but evidence about how much of it is present in any particular commercial vial, which is a different absence and the one we should have named.
On “Bone density during rapid weight loss: what is known, which is less than you…” — Clinical Trials, 18 Oct 2024
I am sixty-eight, I have lost nineteen kilograms over fourteen months, and my consultant has twice told me my lean mass is fine on the basis of a handheld bioimpedance device in the clinic corridor. Having read your piece on what that device measures, I am no longer sure what I have been reassured about.
— R. Whitlam, Adelaide, SA
Nor are we. A handheld device measures impedance across the upper body and infers the rest, and the inference is least reliable exactly where you sit: older, substantial weight change, changing hydration. That is not a criticism of your consultant’s judgement, which may be sound on other grounds, but the device is not the evidence for it.
On “Bone density during rapid weight loss: what is known, which is less than you…” — Clinical Trials, 18 Oct 2024
Small correction to your table: the S-LiTE exercise prescription was two supervised group sessions and two individual sessions weekly, not two sessions in total. The distinction matters because "add some exercise" is not what was tested.
— C. Rautenbach, Pretoria
Correct, and that is precisely the point we were trying to make and then undermined in our own table. Amended.
On “Bone density during rapid weight loss: what is known, which is less than you…” — Clinical Trials, 18 Oct 2024
I have read your protein tables twice and I still cannot work out what I should eat. I appreciate that this is the honest position but it is not a useful one for a person in a supermarket.
— D. Mazzarella, Catania
It is a fair complaint about a real limitation. What we can say is that the defensible range is narrower than the disagreement suggests, that the denominator matters more than the ratio, and that a clinician or dietitian can convert a range into a number for your body in a way that a magazine cannot.
On “Bone density during rapid weight loss: what is known, which is less than you…” — Clinical Trials, 18 Oct 2024
Three vendors have now sent me marketing material claiming their product preserves lean mass during GLP-1 treatment, two of them citing your publication as a source for the underlying composition figures. You may want to know that.
— A. Mbeki, Lusaka
We did not, and we are grateful. Quoting our reporting of a substudy alongside an unevidenced product claim is a misuse of it, and the standards desk has written to all three.
On “Randomised withdrawal is the cleanest design in this field and the least…” — The Ledger, 17 Oct 2024
I stopped eight months ago after reaching a weight I was happy with, and I have regained four of the twenty-two kilograms I lost. Every article I read told me to expect two-thirds back. I am not complaining, but I would like to know whether I am unusual or whether the two-thirds figure was always a mean concealing an enormous range.
— D. Iversen, Aalborg
The second. The published interquartile ranges around those means are wide, and outcomes like yours are well within them. The trials were not designed to explain why some people hold weight after cessation and others do not, and nothing measured at randomisation predicts it usefully. You are not an anomaly; you are part of a distribution nobody quotes.
On “Randomised withdrawal is the cleanest design in this field and the least…” — The Ledger, 17 Oct 2024
You describe the maintenance strategy of stepping down one dose and holding for eight to twelve weeks as something clinicians report doing, and then say it is not a recommendation. That distinction will be lost on most readers, and printing the protocol makes you a source for it whether you intend to be or not.
— G. Escalante, Lima
This is the hardest editorial question this department faces and we do not think you are wrong. Our position is that a practice this widespread is better described accurately, with its evidentiary status stated, than left to circulate in fragments. We accept that the distinction does work that a reader may not do.
On “Randomised withdrawal is the cleanest design in this field and the least…” — The Ledger, 17 Oct 2024
I lost access for eleven weeks during the shortage, restarted at the dose I had been on because nobody told me otherwise, and spent a fortnight unable to keep food down. I had been on that dose for seven months without difficulty. Reading your resumption section was the first time anybody explained it.
— A. Nazarian, Glendale, CA
It is entirely predictable from the label and the pharmacokinetics, and the failure to communicate it during the shortage period was systemic rather than individual. We are sorry it reached you this way and we are glad it reached you.
On “How a release document is put together in a regulated plant” — Analytics, 16 Oct 2024
The most useful sentence in the piece is the one saying a bad document is not a bad product. I have spent two years on forums watching people conclude the opposite from a missing signature block, and it has made the whole conversation about honesty rather than about paperwork.
— A. Chowdhury, Dhaka
That inversion is the reason we wrote the final section, and we would rather be accused of excessive caution than contribute to it.
On “How a release document is put together in a regulated plant” — Analytics, 16 Oct 2024
I supply research peptides and I want to push back on the specification column point. We sell from a catalogue of six hundred products. Writing a meaningful individual specification for each would take a year of somebody’s time, and a generic one would be exactly the decorative limit your article criticises. What would you actually have us do?
— M. Bogdanović, Podgorica
A fair challenge. Our answer is that a generic limit stated honestly is better than no limit at all, provided the typical result is also published so a reader can see the margin. What we object to is a decorative limit presented as a control. Publishing your process capability alongside it removes the objection entirely, and costs you a spreadsheet.
On “How a release document is put together in a regulated plant” — Analytics, 16 Oct 2024
Your ten-minute check told me in about ninety seconds that the batch number on my certificate appears nowhere on the vial. I wrote to the supplier and had a straightforward answer within a day: the certificate covers the bulk lot and the vial carries a fill code. I would never have known to ask.
— F. Okonjo, Asaba
That is exactly the intended use, and the supplier’s answer is the correct one. The remaining question is why the relationship between the two codes is not printed on the document, since it takes a line.
On “Why "muscle-sparing" is a marketing term and not a measurement” — Patient Notes, 16 Oct 2024
I train four times a week, eat a hundred and sixty grams of protein and my appendicular lean mass has fallen by 1.8 kg over ten months while every lift has gone up. Your section on mass against function was the first thing I have read that made that seem normal rather than a failure.
— H. Okwuosa, Enugu