Mersana Therapeutics Inc. has signed a potential billion-dollar agreement with Johnson & Johnson’s Janssen Biotech Inc. to research and develop antibody-drug conjugates (ADCs) for three cancer targets. Janssen will pay $40 million up front as well as more than $1 billion in potential milestone payments in a big day for ADCs, which saw Mersana’s other development partner, Synaffix BV, announce a tie-up with Macrogenics, Inc. in a deal worth up to $586 million.

Cancer diagnostics company Biofidelity Ltd. reported a $23 million series A+ investment round, led by Octopus Ventures with participation from SBI Investment Co. Ltd. and existing investors. Funds will be used for the commercial launch of the company’s first commercial assay Asypre-Lung. The oncology panel is designed to detect DNA mutations from tissue or liquid biopsy quicker than current approaches like gene sequencing.

LONDON – “I really believe we can start using the word cure,” said the pioneer of chimeric antigen receptor T-cell (CAR T) therapy Carl June, as he revealed two leukemia patients he treated in a phase I trial have now been in remission for 10 years. Both patients with chronic lymphocytic leukemia achieved complete remission shortly after treatment in 2010. The genetic modification has remained detectable in their CAR T cells for more than 10 years of follow-up, June said, describing details of the case studies published in Nature Feb. 2.