Targeting DNA Damage Response and Replication Stress in Pancreatic Cancer

BACKGROUND & AIMS

Continuing recalcitrance to therapy cements pancreatic cancer (PC) as the most lethal malignancy, which is set to become the second leading cause of cancer death in our society. The study aim was to investigate the association between DNA damage response (DDR), replication stress, and novel therapeutic response in PC to develop a biomarker-driven therapeutic strategy targeting DDR and replication stress in PC.

METHODS

We interrogated the transcriptome, genome, proteome, and functional characteristics of 61 novel PC patient-derived cell lines to define novel therapeutic strategies targeting DDR and replication stress. Validation was done in patient-derived xenografts and human PC organoids.

RESULTS

Patient-derived cell lines faithfully recapitulate the epithelial component of pancreatic tumors, including previously described molecular subtypes. Biomarkers of DDR deficiency, including a novel signature of homologous recombination deficiency, cosegregates with response to platinum (P < .001) and PARP inhibitor therapy (P < .001) in vitro and in vivo. We generated a novel signature of replication stress that predicts response to ATR (P < .018) and WEE1 inhibitor (P < .029) treatment in both cell lines and human PC organoids. Replication stress was enriched in the squamous subtype of PC (P < .001) but was not associated with DDR deficiency.

CONCLUSIONS

Replication stress and DDR deficiency are independent of each other, creating opportunities for therapy in DDR-proficient PC and after platinum therapy.

Professional holistic care of the person with a stoma: online learning

Stoma care nurse specialists are valued for their diverse expertise, but it is essential that all practitioners who regularly care for people with stomas have the opportunity to develop professionally and influence this important area of practice. The vision of a clinical and educational team from Suffolk and south Norfolk led to the development of innovative web-based learning material. The aim is to inspire nurses to engage actively with people who have a stoma. 'Professional care of the person with a stoma' is about caring for the whole person, physically and emotionally, from the period before surgery, to their continuing care in the community. An overview of four aspects of stoma care is presented here as a way of sharing with a wider audience the expert practice harnessed during the development of this web-based module.