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French drugmaker Sanofi said on Monday (June 13) an upgraded version of the Covid-19 vaccine candidate it is developing with GSK showed potential in two trials to protect against the virus's main variants of concern, including the Omicron BA.1 and BA.2 strains, when used as a booster shot. While the two companies' first experimental Covid shot is undergoing review by the European Medicines Agency, Sanofi and GSK have continued work on a vaccine that is moulded on the now-supplanted Beta variant, hoping still that it will confer broad protection against future viral mutations. Sanofi said this new vaccine candidate was shown to significantly boost antibody levels against a number of variants of concern, when given to trial participants who had an initial course of mRNA vaccines, a type made by BioNTech-Pfizer and Moderna. In a separate trial conducted by a French hospitals network, Sanofi's Beta-adapted booster shot triggered a higher immune response than Sanofi's first-generation shot or Pfizer-BioNTech's established vaccine in previously vaccinated volunteers.

Shares in GSK, Sanofi and Haleon fell sharply on Thursday (August 11) amid growing investor concerns about US litigation focused on a heartburn drug that contained a probable carcinogen, while Johnson and Johnson has decided to end sales of talcum powder after cancer claims. GSK shares were down 6.8 per cent, Sanofi's were down 6.9 per cent and Haleon's down per cent. GSK and Sanofi at various points sold the drug - originally branded as Zantac - which US regulators ordered off the market in 2020. Haleon, spun out as an independent listed company last month, comprises consumer health assets once partly owned by GSK. The prospect of impending litigation is not new. Among other disclosures, recently-listed Haleon had highlighted the risk of such lawsuits in its prospectus. The topic has arrived in investor consciousness in recent days it seems, but has been rumbling on in the background for a few years, Deutsche Bank analysts wrote in a note.

Drugmakers GSK, Pfizer, Sanofi and Boehringer Ingelheim on Tuesday were spared thousands of US lawsuits claiming that the heartburn drug Zantac caused cancer, as a judge found the claims were not backed by sound science. The ruling by US District Judge Robin Rosenberg in West Palm Beach, Florida, knocks out about 50,000 claims in federal court, though it does not directly affect tens of thousands of similar cases pending in state courts around the country. "We are extremely surprised by this miscarriage of justice," and "fully expect" the ruling will be reversed on appeal, lawyers for the plaintiffs said in a joint statement. A Sanofi spokesperson said the decision "significantly decreases the scope of the litigation potentially by over 50 per cent," with the remaining litigation being only in state court. A spokesperson for GSK said the company welcomed the decision and Pfizer said it was pleased by the outcome. Privately-held German drugmaker Boehringer said in a statement that it looked forward to "continuing our vigorous defense of the remaining cases in state courts."

Shares in GSK, Sanofi, Haleon and Pfizer began to recover on Friday (Aug 12) after the companies said that nothing material had changed regarding US litigation focused on heartburn drug Zantac. The companies' share prices had fallen sharply last week on investor concern about the litigation over potential cancer-causing impurities that prompted the drug's withdrawal from markets in 2019 and 2020. More than 2,000 Zantac-related legal cases have been filed in the United States, analysts say, with the first trial beginning this month. The prospect of impending Zantac litigation is not new. Among other disclosures, recently listed Haleon had highlighted the risk of such lawsuits in its prospectus. GSK, Sanofi, Pfizer and Haleon have lost a combined $39 billion from their market value over the past week in the absence of any other particular catalyst, according to Barclays analysts.

Pharmaceutical giant GlaxoSmithKline aims to get its respiratory syncytial virus (RSV) vaccine to regulators for review later this year, after interim data showed the vaccine was effective in a keenly-watched late-stage study involving older adults. RSV is a leading cause of pneumonia in toddlers and the elderly, but the complex molecular structure of the virus and safety concerns have stymied efforts to develop a vaccine since the virus was first discovered in 1956. Companies including Pfizer, J&J, Sanofi, Moderna and AstraZeneca are also racing to get an RSV therapy or vaccine approved. The latest GSK trial is the first to show statistically significant efficacy for RSV in adults aged 60 years and older, the British drugmaker said of the ongoing study on Friday (June 10). If approved, the RSV vaccine is expected to generate billions for GSK, which is already the world's biggest vaccine maker by sales but has faced pressure from activist investors such as Elliott Management who have urged the London-based company to shore up its drug pipeline.

GlaxoSmithKline and Sanofi said on Wednesday (December 15) they expect data from late-stage clinical trials of its booster dose of their Covid-19 vaccine candidate in the first quarter, instead of this year, another delay for the potential shot. The news came as two companies said preliminary data from trials showed the single-dose booster provided strong immune responses. They added that they need more time to test the booster on more people who have not been infected by the virus before they can submit data to regulators. The Phase III trial for the recombinant adjuvanted Covid-19 vaccine recruited most participants in the third quarter, coinciding with a significant increase in the number of people infected globally due to the Delta variant, it said. "To provide the necessary data to regulatory authorities for the booster vaccine submission, the trial will continue to accrue the number of events needed for analysis, with results expected in Q1, 2022." No safety concerns were identified. This is the latest delay for the vaccine's development, putting the companies further behind rivals in the race for Covid-19 shots.