Caution advised. Good quality evidence for this is entirely lacking. Cole has posted a bunch of papers which don’t amount to much at all. The supposed cytotoxic effects of statins on pancreatic beta cells are mechanistic results of dosing cells with massive non-clinical levels of statins (and even so, pitavastatin was the least “toxic” among them barely breaking 10% vs 50+% for other statins). The point is, that with smaller amounts of statins authors of the paper observed the negative effects diminish rapidly - and in practical terms, the amounts used would never reach those levels as the approved and marketed highest dose of pitavastatin tops out at 4mg daily. I’ll return to this dosing point later, but in turn when looking at the MR studies obviously we don’t see cytotoxic effects - people with alleles in the statin MOA pathway don’t suffer from poisoned pancreatic beta cells - so that can’t be the mechanism - meanwhile, all ApoB/LDL lowering alleles are associated with greater T2D propensity, not just statins, not likely they’re all cytotoxic to beta cells. If all different paths lead to the same result - lower LDL and all also lead to higher T2D risk, then it seems the common denominator is obviously not the pathway (as they’re all different!), but the low LDL. Whether you take the car (statin), train (ezetimibe), or helicopter to the beach to swim, and swimming is associated with drowning, while not being the cause of drowning, then it seems blaming the mode of transportation (car/statin) for the drowning is not justified - being twice removed! Thus neither cell-based cytotoxicity nor MR can lay the blame squarely on statins for T2D risk rather than low LDL.
Other papers rounded up by Cole amount to retrospective inquiries and associative relationships between statins and the development of NODM. That needs significant unpacking, because unfortunately those types of studies cannot establish causality for a very good reason - lower levels of LDL are associated with T2D risk INDEPENDTLY OF STATINS! See the paper below. So how do you disentagle the effects of lowering LDL leading to greater risk of T2D and statins leading to LDL - swimming is associated with drowning but swimming does not cause drowning. That’s one reason why all LLT show this kind of relationship, not just statins.
Now, statins can show higher T2D risk regardless of LDL lowering, but it seems that is confined to the high intensity statins. In which case, pitavastatin does not qualify right off the bat - it’s a moderate intensity statin. Combining this with the finding that even in those associative studies pitavastatin shows lower T2D risk increase than other statins, and it seems that the slight association in the case of pitavastatin might be entirely down to the fact that pitavastatin lowers LDL. Therefore in the absence of clear evidence that pitavastatin increases T2D risk, and plenty of outcome studies showing that it does not (including gold standard insulin clamp), I think odds are that indeed pitavastatin does not increase the risk of T2D.
This is a 2025 paper, and I’d recommend reading it rather than relying on AI summaries as in my experience AI summaries are significantly lacking.
A six-year longitudinal study identifies a statin-independent association between low LDL-cholesterol and risk of type 2 diabetes
“When stratifying LDL-C into quartiles [i.e. low (< 84 mg/dL), medium (≥ 84 to < 107 mg/dL), high (≥ 107 to < 131 mg/dL), and very high (≥ 131 mg/dL)], we observed that patients with LDL-C < 84 mg/dL had the highest risk of developing T2D. The interaction between statin therapy and T2D incidence was significant only in the very high LDL-C group, where statin users had a greater risk than non-users (p = 0.018); in the other three LDL-C groups, statin therapy did not significantly modify the association between LDL-C and T2D risk.”
“The increased risk of T2D at lower LDL-C levels appears to be independent of statin use, supporting the role of LDL-C as a potential biomarker of T2D susceptibility.”
This is the paragraph that strongly implies that pitavastatin is likely NOT responsible for elevated risk of T2D: it is NOT a high intensity statin, topping out at 4mg as a moderate intensity statin, which such statins show no elevated risk of T2D.
“When statin interaction was included in an additional multivariable model, only the very high LDL-C group (≥ 131 mg/dL) displayed a significantly elevated risk of T2D in patients on statins compared to those not taking statins (interaction term aHR 1.68, 95% CI 1.09–2.58, p = 0.018). In contrast, the interaction between statin use and T2D risk was not statistically significant in the other LDL-C groups. This finding, in other words, highlights how, while the risk of T2D increases with statin usage by a constant amount in every LDL-C group, this risk is instead different and significantly increased in the very high LDL-C group only. In fact, as can also be observed in Fig. 4, while the statin usage significantly determines an increased risk of T2D at all categories (evidenced by the confidence bands) the steepness of the line plot only deviates, although slightly, at the last category”.
All in all, I think the evidence strongly leans toward pitavastatin NOT elevating T2D risk. So, personally I am not worried about pitavastatin and A1c. However, that still leaves the fact that lower LDL increases T2D risk regardless, especially in genetically susceptible individuals. What that leads me to believe is that you really do need to combine lipid lowering and glucose lowering therapies. Just as untreated cancer witihout side effects of drugs is worse than drug treated cancer with side effects and the addition of drugs which alleviate side effects is better still, so too LLT is better than untreated high ApoB/LDL, but LLT plus glucose control drugs is better than LLT alone. Again, a carefully curated polypharmacy is superior to monotherapy.
This is why I am particularly keen on researching drug interactions - you want the optimal combinations. And when it comes to glucose control and possible toxicity I am far more worried about rapamycin than pitavastatin. I think rapamycin should be paired with glucose control (and lipid control) agents) and possibly beta cell mitochondrial protection agents such as imeglimin. ITP seems to indicate that rapamycin pairs well with glucose control drugs.