A “well-conceived and well-designed” study
In an interview, NYU Langone Health rheumatologist Michael H. Pillinger, MD – an investigator with the ColCORONA trial – praised the Brazilian study. It “appears well-conceived and well-designed, and was enrolled at a rate that was greater than the sample size that was estimated to be needed based on power analysis,” he said.
Dr. Michael H. Pillinger
The Brazilian study is small, he noted. (In contrast, the ColCORONA trial had 4,488 outpatient participants.) “This study differs from ColCORONA in several ways – the most important being that it is a study of inpatients with moderate to severe COVID (really mostly moderate),” he added. “ColCORONA is looking at a target audience that is much larger – outpatients with mild to moderate COVID with risk factors for hospitalization. Both questions are really important and certainly not mutually exclusive, since our care remains inadequate in both venues. This study also adds value in that several other studies have been conducted in hospital patients with enrollment criteria relatively similar to this one, and all showed benefit, but those were open-label or retrospective, and this is blinded and placebo-controlled.”
Using colchicine in patients with COVID-19
Should physicians turn to colchicine in patients with COVID-19? “I would rather that it still be used in the context of research until formal recommendations can be made by bodies like the NIH and CDC,” Dr. Pillinger said. “But certainly, there may be times when physicians feel compelled to treat patients off label.”
He cautioned, however, that colchicine should never be used with some other drugs. Its interaction with the antibiotic clarithromycin can be fatal, he noted. And, he said, the drug must be monitored in general since it can cause rare, severe problems.
“Overall, colchicine probably works on the overabundant inflammatory response to COVID, and it may be that it can be combined with other drugs that affect viral replication or promote immunity – e.g. vaccines,” Dr. Pillinger said. “So far, it seems as if there is no safety problem with combining colchicine with other approaches, but this has not been studied in a rigorous manner.”
Moving forward, he said, the drug’s very low price outside of the United States “could provide resource-poor countries with a way to help keep patients out of precious hospital beds – or help them go home sooner once admitted.” For now, however, “we need a large-scale inpatient study, and one is currently going on in Great Britain. We also need validation of the outpatient ColCORONA study, and studies to look at whether colchicine can work in conjunction with other strategies.”
The study was funded by grants from the São Paulo Research Foundation, Brazilian National Council for Scientific and Technological Development, and CAPES Foundation. No disclosures are reported. Dr. Pillinger reports serving as an investigator for the ColCORONA trial and receiving a unrelated investigator-initiated grant from Hikma, a colchicine manufacturer.