Akari Therapeutics plc announced that it is continuing key research on its antibody-drug conjugate (ADC) payload PH1 to further demonstrate its ability to target cancers fueled by oncogenic drivers. PH1 is a spliceosome modulator designed to disrupt RNA splicing within cells. It binds spliceosome proteins SF3B1 and PH5α and targets normal splicing of pre-mRNA. PH1 is a spliceosome modulator designed to disrupt RNA splicing within cells. It binds spliceosome proteins SF3B1 and PH5α and targets normal splicing of pre-mRNA.