Abstract: This document provides methods and materials for treating cancer (e.g., estrogen receptor positive breast cancer). For example, methods and materials for identifying a mammal (e.g., a human) with cancer (e.g., estrogen receptor positive breast cancer) as having A?G variant genotype of rs6990851 and/or as having an elevated level of CSMD1 nucleic acid expression and administering one or more aromatase inhibitors (e.g., anastrozole) to treat the mammal identified as having such genotype and/or elevated level are provided.

Abstract: This document provides methods and materials for treating cancer (e.g., estrogen receptor positive breast cancer). For example, methods and materials for identifying a mammal (e.g., a human) with cancer (e.g., estrogen receptor positive breast cancer) as having A?G variant genotype of rs6990851 and/or as having an elevated level of CSMD1 nucleic acid expression and administering one or more aromatase inhibitors (e.g., anastrozole) to treat the mammal identified as having such genotype and/or elevated level are provided.

Abstract: This document provides methods and materials related to assessing and treating breast cancer patients. For example, methods and materials that involve assessing a breast cancer patient to determine whether the patient has (1) cancer cells that over express HER-2 polypeptides or comprise a HER-2 amplification and (2) at least an intermediate CYP2D6 metabolizer status are provided.

Abstract: This document provides methods and materials related to assessing the likely outcome for mammals (e.g., humans) with cancer (e.g., breast cancer). For example, methods and materials for using the ratio of HOXB13 polypeptide expression to IL-17BR polypeptide expression, CYP2D6 genotype, medication history, or combinations thereof to determine the likelihood of a breast cancer patient to experience breast cancer relapse or death are provided.

Abstract: This document provides methods and materials related to assessing the likely outcome for mammals (e.g., humans) with cancer (e.g., breast cancer). For example, methods and materials for using the ratio of HOXB13 polypeptide expression to IL-17BR polypeptide expression to determine the likelihood of a breast cancer patient to experience breast cancer relapse or death are provided.

Abstract: This document provides methods and materials related to assessing the likely outcome for mammals (e.g., humans) with cancer (e.g., breast cancer). For example, methods and materials that involve assessing a breast cancer patient's cytochrome P450, family 2, subfamily D, polypeptide 6 (CYP2D6) genotype to determine the likelihood of the beast cancer patient to experience breast cancer relapse or death are provided. Methods and materials that involve assessing the likelihood that a breast cancer patient being treated with tamoxifen will experience side effects such as hot flashes also are provided.