Abstract: The invention described herein provides a method for the treatment of an oestrogen receptor positive breast cancer in a subject in need thereof comprising administering to said subject a therapeutically effective amount of a compound capable of inhibiting MPS1, wherein: (i) said subject has previously been treated with a CDK4/6 inhibitor; and/or (ii) said breast cancer is resistant to treatment with a CDK4/6 inhibitor.

Abstract: The invention described herein provides a method for the treatment of an oestrogen receptor positive breast cancer in a subject in need thereof comprising administering to said subject a therapeutically effective amount of an MPS1 inhibitor, wherein: (i) said subject has previously been treated with an endocrine therapy; and/or (ii) said breast cancer is resistant to endocrine therapy.

Abstract: The invention described herein provides a method for the treatment of an oestrogen receptor positive breast cancer in a subject in need thereof comprising administering to said subject a therapeutically effective amount of a compound capable of inhibiting MPS1, wherein: (i) said subject has previously been treated with a CDK4/6 inhibitor; and/or (ii) said breast cancer is resistant to treatment with a CDK4/6 inhibitor.

Abstract: The present invention provides a combination for the treatment of a disease or condition which responds to dual EGFR and VEGF protein tyrosine kinase inhibition and either aromatase inhibition or inhibition of estrogen action, in particular a proliferative disease, especially a malignant disease, such as breast cancer, comprising a dual EGFR and VEGF protein tyrosine kinase inhibitor and either an aromatase inhibitor or an estrogen receptor antagonist for simultaneous, concurrent, separate or sequential use in reducing cell proliferation in estrogen receptor positive tumors. Also provided is a method of treating a patient suffering from a disease or condition which responds to dual EGFR and VEGF protein tyrosine kinase inhibition and either aromatase inhibition or inhibition of estrogen action comprising administering to the patient an effective amount of a dual EGFR and VEGF protein tyrosine kinase inhibitor and an effective amount of either an aromatase inhibitor or an estrogen receptor antagonist.