Friday, November 17, 2017

Smoke But No Fire: IQOS Opponent Misrepresents 3-Month Studies to FDA

Stanton Glantz, a University of California, San Francisco professor, this week urged the FDA to “…deny [Philip Morris Intermational’s] application to market IQOS [its heat-not-burn cigarette] as a modified risk tobacco product because PMI’s own data fails to support a modified risk claim in people who are actually using the product.”

Glantz’s declaration is based on his review of lab results from two groups of smokers three months after (1) continuing to smoke or (2) switching to IQOS.  The studies, from Japan and the U.S., were submitted by PMI in its application (available at the FDA website here ).

It is well known that individuals’ lab results do not improve instantly upon smoking cessation.  The PMI submission clearly indicated that many of the subjects’ lab values are not expected to change for 6-12 months or longer after quitting. 
Beyond that, Glantz completely ignored a third PMI study group: smokers who had quit completely for three months. 

In this post I present the comparison that Glantz emphasized – IQOS users versus continuing smokers – but I add an equally important comparison that Glantz ignored – IQOS users versus complete quitters.  Because the U.S. study had too few subjects in the latter group  (n=9) for stable comparisons, I will focus on the Japan study, which involved 70 IQOS users, 41 continuing smokers and 37 complete quitters.  I will also note one omission in Glantz’s comparison.

The comparisons of IQOS and continued smoking in the table below were calculated by PMI and presented in its application.  PMI also calculated differences for IQOS versus quitting, but I could not find them in the material released so far by the FDA.  So those comparisons in the table are from my assessment of point estimates and confidence intervals from the submission.  All differences in the table are described positively with respect to health (e.g. IQOS significantly lower).  “NS” indicates no significant difference between groups for that test.

Comparison of Laboratory Values After 3 Months: IQOS Users Versus Continuing Smokers and Versus Complete Quitters in Japan
Lab MarkerIQOS Versus SmokingIQOS Versus Complete Quitting*


White blood cell countIQOS significantly lower**NS
C-reactive proteinNSNS
Soluble ICAMIQOS significantly lowerNS

Oxidative Stress

Prostaglandin F2 alphaIQOS significantly lowerIQOS possibly lower
11-DTX-B2NSQuitting possibly lower

Cholesterol, Triglycerides

High density lipoproteinIQOS significantly higherNS
Low density lipoproteinNSNS
Total cholesterolNSNS
TriglyceridesNSIQOS possibly lower

Blood pressure


Lung function

Forced expiratory vol, 1 sec.NSNS
NS, No significant difference
* My assessment based on point estimates and confidence intervals in submission  
** Omitted by Glantz

The PMI calculations show that IQOS users had four statistically significant favorable comparisons at 3 months compared with smokers.  Other results show no differences.  My assessment of IQOS users versus complete quitters reveals no significant differences for ten lab results.  There were only two possibly significant results favoring IQOS and one favoring complete quitting. 

In summary, the results at three months do not prove anything definitive, which was emphasized in PMI’s application.  These results were not used by PMI to support any positive claims about IQOS; they should not have been used by Professor Glantz to make any counter claims.


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