The present invention provides an ex vivo method for determining whether tumour cells in a patient are, or are likely to become, resistant to a drug that modulates the binding of a steroid hormone to its receptor, comprising: (i) determining the expression level of one or more of the miRNAs listed in Table and/or Table 2 in a biological sample from the patient

The present invention provides an ex vivo method for determining whether tumour cells in a patient are, or are likely to become, resistant to a drug that modulates the binding of a steroid hormone to its receptor, comprising: (i) determining the expression level of one or more of the miRNAs listed in Table 1 and/or Table 2 in a tumour cell sample obtained from the patient

Compositions and methods for covalently bonding a polycarboxylic fatty acid and a SERD (selective estrogen receptor degrader) to form fatty acid-drug conjugate compounds are described. The conjugate compounds are useful for increasing solubility of the SERD as well as targeting the SERD to solid tumors. In particular, the compounds are surprisingly efficacious against tamoxifen-resistant tumors. These types of tumors are recalcitrant to existing therapies and often signal the end stage of cancer...

A particularly constructed tamoxifen-melatonin hybrid ligand gives new and unexpectedly improved results in the prevention and treatment of cancer particularly breast cancer. The hybrid ligand comprises either tamoxifen or 4-hydroxytamoxifen and also melatonin with the tamoxifen or 4-hydroxytamoxifen and melatonin's being linked by an unsubstituted C2-C6 alkyl linker between the tamoxifen amine and the carbonyl of melatonin.