Regeneron Pharmaceuticals confirmed that, as announced by the White House Press Secretary, Regeneron provided a single 8 gram dose of REGNCOV2, a cocktail of two monoclonal antibodies, for use by President Trump. REGN-COV2 is an investigational COVID-19 therapy, which was provided in response to an Individual Patient Investigational New Drug application, commonly known as ‘compassionate use’ request, from the President’s physicians. Regeneron has a compassionate use program with certain established criteria and review committee. As a matter of policy, the company does not disclose whether any individual has or has not submitted a request for compassionate use without their consent or prior disclosure.
White House press secretary Kayleigh McEnany released a statement from U.S. President Donald Trump’s physician Sean P. Conley confirming that, as a precautionary measure, the president has received a single 8 gram dose of Regeneron’s polyclonal antibody cocktail. “He completed the infusion without incident,” Conley said. “In addition to the polyclonal antibodies, the President has been taking zinc, vitamin D, famotidine, melatonin and a daily aspirin.” The physician added that Trump “remains fatigued but in good spirits, noting that he’s “being evaluated by a team of experts.” Conley also said that First Lady Melania Trump “remains well” with only a mild cough and headache, noting that the rest of the First Family tested negative for the virus.
White House physician Sean P. Conley has said that U.S. President Donald Trump has received a “single…dose of Regeneron’s polyclonal antibody cocktail” following his positive COVID-19 diagnosis, CNBC reports. Conely said that the president “remains fatigued but in good spirits,” according to CNBC. Shares of Regeneron rose 3.4% in after-hours trading following the news.
Piper Sandler analyst Christopher Raymond keeps his Overweight rating and $675 price target on Regeneron after the company provided its “long awaited” initial data on its COVID-19 therapeutic antibody cocktail. The analyst notes that the early critiques “miss the forest through the trees”, and that the cocktail represents a “clear reduction of viral load and time to symptom alleviation”. Its “pristine” safety profile should also give the FDA enough evidence to issue an Emergency Use Authorization, Raymond tells investors in a research note.
On September 29, 2020, Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) announced the first data from a descriptive analysis of a seamless Phase 1/2/3 trial of its investigational antibody cocktail REGN-COV2 showing it reduced viral load and the time to alleviate symptoms in non-hospitalized patients with COVID-19. REGN-COV2 also showed positive trends in reducing medical visits. The ongoing, randomized, double-blind trial measures the effect of adding REGN-COV2 to usual standard-of-care, compared to adding placebo to standard-of-care.
This trial is part of a larger program that also includes studies of REGN-COV2 for the treatment of hospitalized patients, and for prevention of infection in people who have been exposed to COVID-19 patients.
“After months of incredibly hard work by our talented team, we are extremely gratified to see that Regeneron’s antibody cocktail REGN-COV2 rapidly reduced viral load and associated symptoms in infected COVID-19 patients,” said George D. Yancopoulos, M.D., Ph.D., President and Chief Scientific Officer of Regeneron. “The greatest treatment benefit was in patients who had not mounted their own effective immune response, suggesting that REGN-COV2 could provide a therapeutic substitute for the naturally-occurring immune response. These patients were less likely to clear the virus on their own, and were at greater risk for prolonged symptoms. We are highly encouraged by the robust and consistent nature of these initial data, as well as the emerging well-tolerated safety profile, and we have begun discussing our findings with regulatory authorities while continuing our ongoing trials. In addition to having positive implications for REGN-COV2 trials and those of other antibody therapies, these data also support the promise of vaccines targeting the SARS-CoV-2 spike protein.”
The descriptive analysis included the first 275 patients enrolled in the trial and was designed to evaluate anti-viral activity with REGN-COV2 and identify patients most likely to benefit from treatment; the next cohort, which could be used to rapidly and prospectively confirm these results, has already been enrolled. Patients in the trial were randomized 1:1:1 to receive a one-time infusion of 8 grams of REGN-COV2 (high dose), 2.4 grams of REGN-COV2 (low dose) or placebo. All patients entering the trial had laboratory-confirmed COVID-19 that was being treated in the outpatient setting. Patients were prospectively characterized prior to treatment by serology tests to see if they had already generated antiviral antibodies on their own and were classified as seronegative (no measurable antiviral antibodies) or seropositive (measurable antiviral antibodies). Approximately 45% of patients were seropositive, 41% were seronegative and 14% were categorized as “other” due to unclear or unknown serology status.
Key data findings include:
Note that since this analysis was considered descriptive, all p-values are nominal.
As hypothesized, patients in the study consisted of two different populations: those who had already mounted an effective immune response, and those whose immune response was not yet adequate. These populations could be identified serologically by the presence (seropositive) or absence (seronegative) of SARS-CoV-2 antibodies, and/or by high viral loads at baseline.
Serological status highly correlated with baseline viral load (p<0.0001). Seropositive patients had much lower levels of virus at baseline, and rapidly achieved viral loads approaching lowest levels quantifiable (LLQ), even without treatment. In contrast, seronegative patients had substantially higher viral levels at baseline, and cleared virus more slowly in the absence of treatment.
Serological status at baseline also predicted how rapidly patients had alleviation of their COVID-19 clinical symptoms. In the untreated (placebo) patients, seropositive patients had a median time to alleviation of symptoms of 7 days, compared to seronegative patients who had a median time to alleviation of symptoms of 13 days.
REGN-COV2 rapidly reduced viral load through Day 7 in seronegative patients (key virologic endpoint). The mean time-weighted-average change from baseline nasopharyngeal (NP) viral load through Day 7 in the seronegative group was a 0.60 log10 copies/mL greater reduction (p=0.03) in patients treated with high dose, and a 0.51 log10 copies/mL greater reduction (p=0.06) in patients treated with low dose, compared to placebo. In the overall population, there was a 0.51 log10 copies/mL greater reduction (p=0.0049) in patients treated with high dose, and a 0.23 log10 copies/mL greater reduction (p= 0.20) in patients treated with low dose, compared to placebo.
Patients with increasingly higher baseline viral levels had correspondingly greater reductions in viral load at Day 7 with REGN-COV2 treatment. The mean log10 copies/mL reduction in viral load compared to placebo were as follows:
- Viral load higher than 105 copies/mL: high dose (-0.93); low dose (-0.86) (p=0.03 for both); approximately 50-60% reduction compared to placebo
- Viral load higher than 106 copies/mL: high dose (-1.55); low dose (-1.65) (p<0.002 for both); approximately 95% reduction compared to placebo
- Viral load higher than 107 copies/mL: high dose (-1.79); low dose (-2.00) (p<0.0015 for both); approximately 99% reduction compared to placebo
Patients who were seronegative and/or had higher baseline viral levels also had greater benefits in terms of symptom alleviation. Among seronegative patients, median time to symptom alleviation (defined as symptoms becoming mild or absent) was 13 days in placebo, 8 days in high dose (p=0.22), and 6 days in low dose (p=0.09). Patients with increasing viral loads at baseline had correspondingly increasing benefit in time to symptom alleviation.
There were a small number of medically-attended visits given that most non-hospitalized patients recover well at home. Patients in the seronegative group were at higher risk of medically-attended visits: 10 of the 12 medically-attended visits (defined as hospitalizations, or emergency room, urgent care or telemedicine visits for COVID-19) occurred in patients who were seronegative at baseline. In the seronegative group, 15.2% of placebo-treated patients, 7.7% of patients treated with high dose and 4.9% of patients treated with low dose required additional medical visits.
Both doses were well-tolerated. Infusion reactions were seen in 4 patients (2 on placebo and 2 on REGN-COV2). Serious adverse events occurred in 2 placebo patients, 1 low dose patient and no high dose patients. There were no deaths in the trial.
More than 2,000 people have been enrolled across the overall REGN-COV2 development program, and no unexpected safety findings have been reported by the Independent Data Monitoring Committee.
“Thank you to the global investigators, sites and patients who continue to work with us to conduct REGN-COV2 trials, especially given the unique challenges posed by the pandemic,” said David Weinreich, M.D., Senior Vice President and Head of Global Clinical Development at Regeneron. “We plan rapidly to submit detailed results from this analysis for publication in order to share insights with the public health and medical communities. Regeneron continues to enroll patients in this trial and all other ongoing late-stage trials evaluating REGN-COV2.”
Additional Trial Background
Among the first 275 patients, approximately 56% were Hispanic, 13% were African American and 64% had one or more underlying risk factors for severe COVID-19, including obesity (more than 40%). On average, patients were 44 years of age. In total, 49% of participants were male and 51% were female.
At least 1,300 patients will be recruited into the Phase 2/3 portion of the outpatient trial overall. Patients will be followed for 29 days, with viral shedding in the upper respiratory tract assessed approximately every 2-3 days in the Phase 2 portion of the trial and clinical endpoints assessed via investigator and patient-reported data throughout.
REGN stock moved higher in after-hours trading on October 2, 2020.