Effectiveness of hydroxychloroquine, azithromycin against Covid-19

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The US President’s tweet referenced the results of a study conducted in France, which was published in the International Journal of Antimicrobial Agents last week title “Hydroxychloroquine and azithromycin as a treatment of COVID‐19: results of an open‐label non‐randomized clinical trial”.

The study was performed at the infection hospital l’Institut Hospitalo-Universitaire (IHU) Méditerranée Infection in Marseille and Professor Didier Raoult published a video explaining the trials on Monday, March 16. All patients at the Marseille center were given oral hydroxychloroquine sulfate 200 mg, three times per day during 10 days.

Social media posts incorrectly promoted the French study as a trial conducted by the country’s largest drugmaker Sanofi and went on to recommend Sanofi’s hydroxychloroquine brand Plaquenil as ‘anti-corona’.

There is no mention of Sanofi or Plaquenil in the research publication which attributes its funding support to the French government.

Effectiveness of hydroxychloroquine, azithromycin against Covid-19

An analysis of the results of the study shows that on day 6 the effectiveness of the treatments on 36 patients was:

— 100 percent (6/6 patients tested negative) for hydroxychloroquine + azithromycin

— 57 percent (8/14 patients tested negative) for hydroxychloroquine as a stand-alone therapy

— 13 percent (2/16 patients tested negative) for the control therapy (which is not described in the paper)

The lesser known details — 1 patient died, 3 patients transferred to ICU

However, the original study had enrolled 42, and not 36 patients. The publication shares the details of the six hydroxychloroquine-treated patients who failed to complete the trial and could not be tested on day 6 for the presence of Covid-19. The reasons to not be tested were:

– Three patients, who were still testing positive, were transferred to the intensive care unit (ICU)

– One patient, who tested negative on day 2, died on day 3

– One patient, although testing positive on days 1 to 3, stopped treatment because of nausea

– One patient left the hospital after testing negative on days 1, 2

The results also highlight that one patient who was still testing positive on day 6 under hydroxychloroquine only treatment, received azithromycin in addition to hydroxychloroquine and was cured off her infection on day 9.

However, one of the patients under hydroxychloroquine and azithromycin combination who tested negative at Day 6, tested positive on Day 8.

Negative results were reported at a lower limit

The trial in France used the RT-PCR testing methodology to determine if a person had Covid-19 and reported the Cycle Threshold (CT) reading.

The RT-PCR technology builds on a Nobel Prize winning technique of PCR, or polymerase chain reaction, which is a DNA amplification technique that is routinely used in laboratories to turn tiny amounts of DNA into large enough quantities that can be analyzed. For scientists to detect a virus like Covid-19, they also need to turn its genome, which is made of a single-strand RNA, into DNA. In order to do this, an enzyme called reverse-transcriptase is utilized.

Combining the two techniques created RT-PCR and when the DNA is combined with a fluorescent dye, that glows in the presence of DNA, PCR can actually tell scientists how much DNA there is.

The cycle threshold (CT) is the number of cycles which are required for the fluorescent signal to cross an established threshold. CT levels are also inversely proportional to the amount of target nucleic acid in the sample (i.e. the lower the CT level the greater is the amount of the viral load).

As per the method guidelines published on the United States Food and Drug Administration (FDA) website “when all controls exhibit the expected performance, a specimen is considered negative if all 2019- nCoV marker (N1, N2) cycle threshold growth curves DO NOT cross the threshold line within 40.00 cycles (< 40.00 Ct)”.

The French study reported negative results at a CT value of 35 as against the FDA guidance of 40 cycles, which indicates reporting negative results earlier than what would have been acceptable to the FDA.

In addition, as a lower CT number indicates a higher amount of the nucleic acid load, in all cases where the patients had a CT of less than 22 at the start of the study, they failed to test negative on the hydroxychloroquine-only treatment.

The hydroxychloroquine-azithromycin combination was only administered and effective on patients with a CT of more than 23.

The expected surge in demand for hydroxychloroquine

Following Trump’s tweet, Novartis pledged to donate up to 130 million hydroxychloroquine tablets, pending regulatory approvals for Covid-19, Mylan announced it was ramping up production to make 50 million tablets and Teva said it was donating 16 million tablets to hospitals around the US.

PharmaCompass’ MarketPlace has been flooded with requests for hydroxychloroquine sulphate, chloroquine phosphate (although hydroxychloroquine clinical safety profile is better than that of chloroquine, in long-term use, and allows higher daily dose) and azithromycin and API suppliers have informed us that their capacities are sold out.

With pharmacies running out of the drugs, in a surprise move the FDA made an exception to the four-year old ban placed on India’s Ipca Labs, one of the major manufacturers of chloroquine and hydroxychloroquine, to sell their drugs in the United States.

The company informed the bourses that due to the shortage implications and/or medical necessity of certain drugs and finished products, the import alert for the company’s hydroxychloroquine sulphate and chloroquine phosphate APIs and hydroxychloroquine sulphate tablets had been partially lifted.

In a recent August 2019 inspection, the FDA had observed “a cascade of failure” in Ipca’s quality unit.

Our view

We support the authors of the study who themselves acknowledge that  “our study has some limitations including a small sample size, limited long-term outcome follow-up, and dropout of six patients from the study, however in the current context, we believe that our results should be shared with the scientific community.”

While the world is desperately looking for solutions, a balanced view of the results is necessary. And it’s important to reiterate that we are far away from finding a quick fix to the single biggest health emergency in years.

Continue at: https://www.pharmacompass.com/radio-compass-blog/hydroxychloroquine-hype-versus-reality

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