Mersana Therapeutics Inc. is getting $100 million up front in an option deal with GSK plc for preclinical-stage antibody-drug conjugate (ADC) XMT-2056, which could bring up to $1.36 billion more in an option exercise payment, development, regulatory and commercial milestones. It’s the second potential $1 billion-plus ADC deal for Cambridge, Mass.-based Mersana in 2022 and the first for its Immunosynthen platform, which uses a STING agonist payload specifically designed for ADCs.

Pfizer Inc. plans to pay about $5.8 billion – total equity value – for Global Blood Therapeutics Inc. (GBT) and its oral sickle cell disease (SCD) treatment Oxbryta (voxelotor). The company reported the enterprise value as $5.4 billion, which includes debt and net cash. If completed, the GBT buy would be the second largest M&A in 2022 after Pfizer’s $6.7 billion buyout of Arena Pharmaceuticals Inc. Oxbryta, which netted about $195 million in sales in 2021, gained U.S. FDA approval in November 2019 for the treatment of SCD in adults and pediatric patients ages 12 and up. The FDA later expanded Oxbryta’s approved uses to SCD patients 4 years of age and older in December 2021.

Shionogi & Co. Ltd. has in-licensed Japan rights to Grunenthal GmbH’s intra-articular injectable, resiniferatoxin, for the treatment of pain associated with osteoarthritis of the knee. Currently in phase III trials, RTX is a transient receptor potential vanilloid 1 agonist, which can reversibly desensitize TRPV1-expressing nociceptors. This mechanism may result in long-lasting pain relief.

While biopharma M&As fail to keep up with prior years, the dealmaking environment remains strong, as deal values continue to grow. Through early August of this year, biopharma companies have completed 955 deals, including licensings, joint ventures and collaborations, valued at $114.5 billion, which is 7% more than last year ($107 billion) and 2% more than 2020 ($112.2 billion).

Amgen Inc. is paying $3.7 billion in cash to buy Chemocentryx Inc. The deal, with Amgen paying $52 per share for Chemocentryx stock, brings Amgen Tavneos (avacopan), a first-in-class medicine for treating antineutrophil cytoplasmic antibody-associated vasculitis, which destroys small blood vessels.

Shares of Poseida Therapeutics Inc. (NASDAQ:PSTX) closed at $4.51, up $2.08, or 85%, as a result of the collaboration and licensing deal with Roche Holding AG that brings $110 million up front as well as the same amount in near-term milestone payments described by CEO Mark Gergen as “highly achievable,” and the arrangement could be worth as much as $6 billion if goals farther down the road are met.

Sosei Heptares and Abbvie Inc. have built on the huge, multitarget deal they cut a little more than two years ago by signing another one.

Apollo Therapeutics Group Ltd. has bought worldwide rights to Avalo Therapeutics Inc.’s anti-IL-18 antibody, camoteskimab, in a deal worth up $89 million, taking on development of the early stage drug for arthritis and potentially other diseases.