PGR and breast cancer: Docking scores are reported against three breast cancer targets: progesterone receptor (PR, PDB 2W8Y), HER2 tyrosine kinase domain (PDB 7JXH), and estrogen-receptor-α ligand-binding domain (PDB 6VJD), together with pIC50 values predicted by the QSAR model (pIC50 = −log10 IC50, M).