Asher Bio adds $55M and takes a page from nature for cancer immunotherapy March 23, 2021 Auto Bot BioPharma, biopharma nl, cancer immunotherapy, News, Pharma, South San Francisco 0 Interluekin-2’s use as an immunotherapy has been limited by its severe side effects. Asher Bio is developing a version of IL-2 that the startup’s Chief Technology Officer Andy Yeung said could be more targeted and safer than other approaches.