PARP1 and hypoparathyroidism-retardation-dysmorphism syndrome: Lastly, we propose that miR-155-5p might play a role in the response to the poly(ADP-ribose) polymerase-1 (PARP-1) inhibitor Olaparib (AZD2281) which have been receiving much attention as promising therapeutic strategy beyond BRCA-mutant tumors, such as those with BRCAness and homologous recombination deficiency (HRD).