Evaluation of the Relative Bioavailability and Food Effect of GDC-9545 in Healthy Females of Non-Childbearing Potential

Inclusion Criteria

• Females of non-childbearing potential including non-pregnant, non-lactating, and either postmenopausal or surgically sterile for at least 90 days prior to screening, as defined in the protocol
• Body mass index (BMI) from 18.5 to 30.0 kilograms per square metre of body surface area (kg/m^2) at screening
• In good health, determined by no clinically significant findings from medical history, 12-lead ECG, or vital signs
• Clinical laboratory evaluations within the reference range for the test laboratory, unless deemed not clinically significant by the investigator
• Negative test for selected drugs of abuse at Screening (does not include alcohol) and at Check-in (Day -1) for Period 1 (does include alcohol)
• Negative hepatitis panel (hepatitis B surface antigen and hepatitis C virus antibody) and negative human immunodeficiency virus (HIV) antibody screens
• Subject must receive an explanation of the mandatory Research Biosample Repository (RBR) component of the study and be able to comprehend and willing to sign an Informed Consent Form (ICF)

Exclusion Criteria

• Significant history or clinical manifestation of any metabolic, allergic, dermatological, hepatic, renal, hematological, pulmonary, cardiovascular, gastrointestinal (GI), neurological, or psychiatric disorder (as determined by the investigator)
• History of significant hypersensitivity, intolerance, or allergy to any drug compound, food, or other substance, unless approved by the investigator
• History of allergy to GDC-9545 or any of its excipients
• History of stomach or intestinal surgery (including cholecystectomy) or resection that would potentially alter absorption and/or excretion of orally administered drugs (except that appendectomy and hernia repair will be allowed)
• History or presence of an abnormal ECG that, in the investigator's opinion, is clinically significant including complete left bundle branch block; right bundle branch block; first-, second-, or third-degree heart block; sick sinus syndrome; or evidence of prior myocardial infarction
• Having a QTc interval greater than (>)470 milliseconds (msec), PR interval >210 msec, or QRS complex >120 msec
• Confirmed (e.g., 2 consecutive measurements) baseline heart rate ≤50 beats per minute (bpm) prior to enrollment
• History of alcoholism or drug addiction within 1 year prior to Check-in (Day -1) of Period 1
• The use of tobacco- or nicotine-containing products within 6 months prior to Check-in (Day -1) of Period 1
• History of active or latent tuberculosis (TB), regardless of treatment history
• History of previous use of tamoxifen, aromatase inhibitors, or any other endocrine agent for the treatment of breast cancer
• The use of hormone replacement therapy or selective ER modulators (SERMs; e.g., raloxifene) within 1 year prior to Check-in (Day -1) of Period 1
• The use of oral antibiotics within 4 weeks or intravenous antibiotics within 8 weeks prior to Check-in (Day -1) of Period 1
• The use or intent to use any medications/products known to alter drug absorption, metabolism, or elimination processes, including St. John's wort, within 30 days prior to Check-in (Day -1) of Period 1
• The participation in any other investigational study drug trial in which receipt of an investigational study drug occurred within 5 half-lives or 30 days, whichever is longer, prior to Check-in (Day -1) of Period 1
• The use of drugs of abuse (including opioids) within 4 weeks of Screening
• The use of any prescription medications/products within 14 days prior to Check-in (Day -1) of Period 1, unless deemed acceptable by the investigator
• The use of any over-the-counter, non-prescription preparations (including vitamins; minerals; and phytotherapeutic-, herbal-, and plant-derived preparations) within 7 days prior to Check-in (Day -1) of Period 1, unless deemed acceptable by the investigator
• The use of poppy seed-containing foods or beverages within 7 days prior to Check-in (Day -1) of Period 1,