> Trialight public data. Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/a-study-of-lae118-as-monotherapy-and-in-combination-with-700cf3b8-7cbc-4ced-93a0-2d4b661c32b8 > Record changed: 2026-10-13 # A Study of LAE118 as Monotherapy and in Combination With Antitumor Agents in Advanced Solid Tumors NCT07787520 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) Phase Phase 1 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) Recruitment status Not yet recruiting Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) Participants 150 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) Lead sponsor Laekna Limited Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) Start date 2026-08-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) Number of sites 6 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Title and summary **Summary** Study Title: A Phase I, Open-Label, Dose-Escalation and Expansion Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Preliminary Efficacy of LAE118 as Monotherapy and in Combination With Other Antitumor Agents in Patients With Advanced Solid Tumors Study Design Overview: This is an open-label, multicenter Phase I clinical trial comprising three cohorts: Cohort A (LAE118 monotherapy), Cohort B (LAE118 plus fulvestrant), and Cohort C (LAE118 plus fulvestrant and palbociclib). Each cohort consists of two stages. Stage I evaluates safety and determines the maximum tolerated dose (MTD) and recommended dose (RD) of LAE118; Stage II assesses the preliminary efficacy of LAE118 at the RD. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Short title** A Study of LAE118 as Monotherapy and in Combination With Antitumor Agents in Advanced Solid Tumors Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Official title** A Phase I, Open-Label, Dose-Escalation and Expansion Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Preliminary Efficacy of LAE118 as Monotherapy and in Combination With Other Antitumor Agents in Patients With Advanced Solid Tumors Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Status and phase **Control arm** Open label Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Registry reports results** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Recruitment status** Not yet recruiting Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Phase** Phase 1 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Dates **Completion date** 2029-12-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **First posted** 2026-08-26 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Registry last updated** 2026-08-26 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Primary completion date** 2029-03-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Start date** 2026-08-01 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Size and sites **Participants** 150 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Participant count basis** Estimated Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Planned participants** 150 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Protocol amendments** 0 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Number of sites** 6 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Sponsor and oversight **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Lead sponsor** Laekna Limited Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Identifiers **Registry ID** NCT07787520 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **ClinicalTrials.gov ID** NCT07787520 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Study design **Allocation** Not randomised **Model** Sequential **Purpose** Other **Masking** No masking Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Outcomes ### Primary outcomes 1. Number of participants with adverse events (AEs) Timeframe: From ICF signing to 30 days after last dose, up to \~24 months Frequency and severity of AEs, including treatment-related AEs, serious AEs (SAEs), and AEs leading to treatment discontinuation, as assessed by CTCAE v5.0. 2. Number of participants with dose-limiting toxicities (DLTs) Timeframe: 35 days (Cohort A) / 28 days (Cohorts B and C) Per protocol definition. DLT observation period: C0D1-C1D28 for Cohort A; C1D1-C1D28 for Cohorts B and C. 3. Change from baseline in QTcF interval as assessed by 12-lead ECG Timeframe: Baseline to EOT, up to \~24 months Triplicate recordings within 10 min, ≥1 min apart. Fridericia's correction。 Unit: msec 4. Change from baseline in PR interval as assessed by 12-lead ECG Timeframe: Baseline to EOT, up to \~24 months Unit: bpm 5. Change from baseline in QRS duration as assessed by 12-lead ECG Timeframe: Baseline to EOT, up to \~24 months Unit: msec 6. Change from baseline in heart rate as assessed by 12-lead ECG Timeframe: Baseline to EOT, up to \~24 months Unit: bpm 7. Change from baseline in systolic and diastolic blood pressure Timeframe: Baseline to EOT, up to \~24 months Unit: mmHg 8. Change from baseline in pulse rate Timeframe: Baseline to EOT, up to \~24 months Unit: bpm 9. Change from baseline in respiratory rate Timeframe: Baseline to EOT, up to \~24 months Unit: breaths/min 10. Change from baseline in body temperature Timeframe: Baseline to EOT, up to \~24 months Unit: °C 11. Change from baseline in physical examination findings Timeframe: Baseline to EOT, up to \~24 months Full-body exam at screening and EOT; targeted exam (head/neck, cardiovascular, respiratory, abdominal, musculoskeletal, neurological, skin) at other visits. Presence of clinically significant abnormalities. 12. Change from baseline in hematology parameters Timeframe: Baseline to EOT, up to \~24 months WBC with differential (10⁹/L), RBC (10¹²/L), hemoglobin (g/L), hematocrit (%), platelet count (10⁹/L). 13. Change from baseline in serum chemistry - enzymes Timeframe: Baseline to EOT, up to \~24 months ALT, AST, ALP, GGT, LDH, CK, CK-MB, amylase, lipase. Unit: U/L 14. Change from baseline in serum chemistry - bilirubin, creatinine, and bile acids Timeframe: Baseline to EOT, up to \~24 months Total bilirubin, direct bilirubin, creatinine, bile acids. Unit: μmol/L 15. Change from baseline in serum chemistry - electrolytes and metabolites Timeframe: Baseline to EOT, up to \~24 months Sodium, potassium, calcium, magnesium, phosphorus, BUN/urea, total cholesterol, HDL-C, LDL-C, triglycerides. Unit: mmol/L 16. Change from baseline in serum albumin and total protein Timeframe: Baseline to EOT, up to \~24 months Unit: g/L 17. Change from baseline in prothrombin time (PT) and activated partial thromboplastin time (aPTT) Timeframe: Baseline to EOT, up to \~24 months Unit: seconds 18. Change from baseline in international normalized ratio (INR) Timeframe: Baseline to EOT, up to \~24 months 19. Change from baseline in fibrinogen Timeframe: Baseline to EOT, up to \~24 months Unit: g/L 20. Change from baseline in thyroid-stimulating hormone (TSH) Timeframe: Baseline to EOT, up to \~24 months mIU/L 21. Change from baseline in free triiodothyronine (FT3) and free thyroxine (FT4) Timeframe: Baseline to EOT, up to \~24 months Unit: pmol/L 22. Change from baseline in adrenal function parameters Timeframe: Baseline to EOT, up to \~24 months Cortisol, ACTH, aldosterone, renin, and aldosterone/renin ratio. 23. Change from baseline in troponin I/T Timeframe: Baseline to EOT, up to \~24 months Unit: ng/mL 24. Change from baseline in brain natriuretic peptide (BNP) Timeframe: Baseline to EOT, up to \~24 months Unit: pg/mL 25. Change from baseline in urinalysis parameters Timeframe: Baseline to EOT, up to \~24 months Urine protein, glucose, ketones, occult blood, and specific gravity. ### Secondary outcomes 1. Objective response rate (ORR) Timeframe: Every 8 weeks from C1D1 to progression/EOT, up to \~24 months Proportion of participants with CR or PR per RECIST v1.1 by investigator assessment. 2. Clinical benefit rate (CBR) Timeframe: Every 8 weeks from C1D1, up to \~24 months Proportion of participants with CR, PR, or SD ≥24 weeks per RECIST v1.1. 3. Duration of response (DOR) Timeframe: From first response to progression/death, up to \~24 months Time from first CR/PR to disease progression or death per RECIST v1.1. 4. Progression-free survival (PFS) Timeframe: C1D1 to progression/death, up to \~24 months Time from first dose to disease progression per RECIST v1.1 5. Peak plasma concentration (Cmax) of LAE118 Timeframe: Day 1 and Day 15: pre-dose and at 0.5, 1, 2, 3, 4, 5, 6, 8, 12, and 24 hours post-dose. Peak plasma concentration (Cmax) of LAE118 following single dose (Cycle 0 Day 1 for Cohort A; Cycle 1 Day 1 for Cohorts B and C) and multiple dose (Cycle 1 Day 15). Unit: ng/mL 6. Time to peak plasma concentration (Tmax) of LAE118 Timeframe: Day 1 and Day 15: pre-dose and at 0.5, 1, 2, 3, 4, 5, 6, 8, 12, and 24 hours post-dose. Time to peak plasma concentration (Tmax) of LAE118 following single dose on Day 1 and multiple doses on Day 15\. Unit: hours 7. Area under the plasma concentration-time curve (AUC0-t, AUC0-∞, AUC0-24, AUCtau) of LAE118 Timeframe: Day 1 (single-dose period) and Day 15 (multiple-dose period): pre-dose and at 0.5, 1, 2, 3, 4, 5, 6, 8, 12, and 24 hours post-dose. Area under the plasma concentration-time curve (AUC0-t, AUC0-∞, AUC0-24, and AUCtau) of LAE118\. AUC0-t and AUC0-∞ following both single and multiple doses; AUC0-24 following single dose only (Day 1); AUCtau following multiple doses only (Day 15). Unit: ng·h/mL 8. Terminal half-life (t1/2) of LAE118 Timeframe: Day 1 (single-dose period) and Day 15 (multiple-dose period): pre-dose and at 0.5, 1, 2, 3, 4, 5, 6, 8, 12, and 24 hours post-dose. Following single and multiple dose. Unit: hours 9. Apparent volume of distribution (Vz/F) of LAE118 Timeframe: Day 1 (single-dose period) and Day 15 (multiple-dose period): pre-dose and at 0.5, 1, 2, 3, 4, 5, 6, 8, 12, and 24 hours post-dose. Following single and multiple dose. Unit: L 10. Apparent clearance (CL/F) of LAE118 Timeframe: Day 1 (single-dose period) and Day 15 (multiple-dose period): pre-dose and at 0.5, 1, 2, 3, 4, 5, 6, 8, 12, and 24 hours post-dose. Following single and multiple dose. Unit: L/h 11. Trough plasma concentration (Ctrough) of LAE118 Timeframe: Pre-dose on Day 15 of Cycle 1 (each cycle is 28 days). Trough plasma concentration (Ctrough) of LAE118 following multiple doses on Cycle 1 Day 15\. Unit: ng/mL 12. Accumulation ratio (Racc) of LAE118 Timeframe: Single-dose baseline (Cycle 0 Day 1 for Cohort A; Cycle 1 Day 1 for Cohorts B and C) and multiple-dose steady-state (Cycle 1 Day 15 for all cohorts). Each cycle is 28 days. Accumulation ratio (Racc) of LAE118 following multiple doses (Cycle 1 Day 15 versus single-dose baseline). Unit: ratio 13. Cmax of fulvestrant and palbociclib Timeframe: Cycle 1 Day 1 and Cycle 1 Day 15: pre-dose and at 0.5, 1, 2, 3, 4, 5, 6, 8, 12, and 24 hours post-dose. Each cycle is 28 days. Maximum plasma concentration (Cmax) of fulvestrant and palbociclib when co-administered with LAE118 on Cycle 1 Day 1 (single dose) and Cycle 1 Day 15 (multiple doses). Unit: ng/mL 14. Tmax of fulvestrant and palbociclib Timeframe: Cycle 1 Day 1 and Cycle 1 Day 15: pre-dose and at 0.5, 1, 2, 3, 4, 5, 6, 8, 12, and 24 hours post-dose. Each cycle is 28 days. Time to maximum plasma concentration (Tmax) of fulvestrant and palbociclib when co-administered with LAE118 on Cycle 1 Day 1 (single dose) and Cycle 1 Day 15 (multiple doses). Unit: hours 15. AUC0-t of fulvestrant and palbociclib Timeframe: Cycle 1 Day 1 and Cycle 1 Day 15: pre-dose and at 0.5, 1, 2, 3, 4, 5, 6, 8, 12, and 24 hours post-dose. Each cycle is 28 days. Area under the plasma concentration-time curve from time 0 to the last quantifiable time point (AUC0-t) of fulvestrant and palbociclib when co-administered with LAE118 on Cycle 1 Day 1 (single dose) and Cycle 1 Day 15 (multiple doses). Unit: ng·h/mL 16. Change from baseline in fasting blood glucose Timeframe: Baseline to EOT, up to \~24 months Unit: mmol/L 17. Change from baseline in glycated hemoglobin (HbA1c) and glycated albumin Timeframe: Baseline to EOT, up to \~24 months Unit: % 18. Change from baseline in serum C-peptide Timeframe: Baseline to EOT, up to \~24 months Unit: ng/mL 19. Change from baseline in serum insulin Timeframe: Baseline to EOT, up to \~24 months Unit: μIU/mL 20. Change from baseline in QTcF interval and its relationship with plasma LAE118 concentration Timeframe: Baseline to EOT, up to \~24 months Unit: msec Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Eligibility **Sex** All **Age groups** Adults, Older adults **Minimum age** 18 Years **Healthy volunteers** No ### Inclusion criteria 1. Age ≥18 years at the time of signing the informed consent form. 2. Ability to provide written informed consent to participate in this study. 3. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1. 4. During the screening period, a blood sample must be provided for PIK3CA testing at the central laboratory. Only participants with confirmed positive PIK3CA mutation results are eligible for enrollment. Participants with previously documented positive PIK3CA mutation results from local laboratory testing may be enrolled; however, a blood sample must still be collected during the screening period for central laboratory confirmation. 5. At least one measurable lesion as defined by RECIST version 1.1 criteria. 6. Histologically or cytologically confirmed locally advanced (unresectable) or metastatic solid tumor, meeting the specific criteria for each cohort: Cohort A (Stage I, Dose Escalation): Histologically or cytologically confirmed locally advanced (unresectable) or metastatic solid tumor. Lymphoma is excluded. Cohort A (Stage II): Histologically or cytologically confirmed locally advanced (unresectable) or metastatic head and neck squamous cell carcinoma (HNSCC) or gynecologic cancers (ovarian, cervical, or endometrial cancer). Cohort A (Stage I, Backfill Enrollment) and Cohorts B/C: Histologically or cytologically confirmed locally advanced (unresectable) or metastatic HR+/HER2- breast cancer, based on the most recent tumor specimen. HR+/HER2- breast cancer is defined as HER2-negative and ER-positive, regardless of PR expression status. Estrogen receptor (ER) positive: Defined as ≥1% of tumor cells demonstrating ER positivity by immunohistochemistry (IHC). Progesterone receptor (PR) positive: Defined as ≥1% of tumor cells demonstrating PR positivity by IHC. HER2-negative: Defined as IHC intensity of 0 or 1+, or IHC intensity of 2+ without evidence of amplification by in situ hybridization (ISH), or absence of IHC testing and no evidence of amplification by ISH (based on the 2023 updated ASCO-CAP guidelines). 7. Prior antitumor therapy: Cohort A: Disease progression after adequate standard therapy, or no effective standard therapy available. Cohorts B/C: Receipt of no more than 3 lines of systemic antitumor therapy in the advanced setting (including at least 1 line of endocrine therapy, no more than 1 line of CDK4/6 inhibitor therapy, and no more than 1 line of chemotherapy). If disease recurrence occurs during adjuvant endocrine therapy or within 12 months of completion of adjuvant endocrine therapy, such adjuvant therapy will be counted as one line of prior therapy. Prior fulvestrant therapy is permitted; however, the proportion of participants with prior fulvestrant exposure must not exceed 50% of the total enrolled participants in Cohort B and Cohort C, respectively. 8. Female participants with HR+/HER2- advanced breast cancer who are postmenopausal, premenopausal, or perimenopausal are eligible for enrollment. In Cohorts B/C, male participants and female participants with HR+/HER2- advanced breast cancer who are premenopausal or perimenopausal must receive continuous ovarian function suppression throughout the study period (initiation of luteinizing hormone-releasing hormone agonist \[LHRHa\] no later than Day 1 of Cycle 1). Menopause is defined as follows \[34\]: Prior bilateral oophorectomy. Age ≥60 years. Age <60 years with amenorrhea for ≥12 months in the absence of prior chemotherapy, tamoxifen, toremifene, or ovarian suppression, and with estradiol and follicle-stimulating hormone (FSH) levels in the postmenopausal range. Age <60 years with chemotherapy-induced amenorrhea for ≥12 months and FSH and estradiol levels consistently in the postmenopausal range upon serial assessment. Age <60 years currently receiving tamoxifen with FSH and estradiol levels in the postmenopausal range. 9. Participants in Cohorts B/C must have no contraindications to fulvestrant, including hypersensitivity to fulvestrant or any of its components, or hepatic impairment classified as Child-Pugh Class B or C. Participants in Cohort C must have no contraindications to palbociclib, including hypersensitivity to palbociclib or any of its components. 10. Fasting plasma glucose <7.7 mmol/L and hemoglobin A1c (HbA1c) <7.0%. 11. A minimum washout period of 4 weeks or 5 half-lives (whichever is shorter) between the end of the last antitumor therapy and the planned start date of study treatment. 12. Completion of radiotherapy at least 4 weeks prior to the planned start date of study treatment; completion of palliative radiotherapy for bone or other metastatic lesions at least 2 weeks prior to the planned start date of study treatment. 13. Ability to swallow and absorb oral medications, with no gastrointestinal disorders that would interfere with drug absorption. 14. Resolution of toxicities related to prior antitumor therapy to Grade ≤1, except for stable residual symptoms (alopecia, peripheral sensory neuropathy, skin hyperpigmentation, dysgeusia). 15. Female participants of childbearing potential must agree to use highly effective contraception from the time of enrollment until at least 1 year after the last dose of study treatment. Acceptable methods include: Complete abstinence (if this is their preferred and usual lifestyle). Intrauterine device (IUD) or hormonal intrauterine system. Contraceptive implant. Oral contraceptives (combined with barrier contraception). Partner has undergone vasectomy with confirmed azoospermia. Male participants with female partners of childbearing potential must agree to use effective contraception (e.g., condom use) from the time of enrollment until at least 1 year after the last dose of study treatment. 16. Female participants of childbearing potential must have a negative serum pregnancy test during the screening period. 17. Adequate organ function, defined as follows: Hematologic: The following criteria must be met without the use of erythropoietin, growth factors, or packed red blood cell transfusion within 14 days prior to screening laboratory assessments: Absolute neutrophil count (ANC) ≥1.5 × 10⁹/L. Platelet count ≥100 × 10⁹/L. Hemoglobin ≥10.0 g/dL. Hepatic: Total bilirubin ≤1.5 × upper limit of normal (ULN). Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤2.5 × ULN (or ≤3 × ULN for participants with liver metastases). Serum albumin ≥30 g/L. Renal: Creatinine clearance ≥60 mL/min (calculated using the Cockcroft-Gault formula). Coagulation: International normalized ratio (INR) ≤1.5 × ULN. Activated partial thromboplastin time (aPTT) ≤1.5 × ULN. For participants requiring anticoagulation with warfarin, INR must be stably maintained within the range of 2 to 3\. For participants with mechanical heart valves requiring anticoagulation, INR may be maintained within the range of 2.5 to 3.5. Adrenal function tests during screening show no clinically significant abnormalities. 18. Bone mineral density testing (dual-energy X-ray absorptiometry \[DEXA\]) must be performed during the screening period, with a T-score >-2.5 (based on the lowest value across multiple sites assessed). ### Exclusion criteria 1. Prior treatment with a PI3K, AKT, or mTOR inhibitor without clinical benefit ("benefit" defined as achieving a best overall response \[BOR\] of CR/PR/SD during PI3K, AKT, or mTOR inhibitor therapy), except for participants who discontinued treatment due to documented intolerance. 2. Cohort C only: Participants with prior palbociclib exposure are not eligible for enrollment. 3. Participants with type 1 diabetes mellitus or type 2 diabetes mellitus requiring antidiabetic medication are not eligible for enrollment. 4. Participants with metaplastic breast cancer or inflammatory breast cancer. 5. Known active, uncontrolled, or symptomatic central nervous system (CNS) metastases or leptomeningeal carcinomatosis. Participants with previously treated CNS metastases may be enrolled if all of the following criteria are met: At least one measurable non-CNS lesion per RECIST version 1.1 criteria. No history of intracranial or spinal cord hemorrhage. Radiographic stability: No evidence of progression on imaging following completion of CNS-directed therapy. The interval between post-treatment imaging and screening imaging must be at least 4 weeks, with no evidence of progression. Clinical stability: No requirement for corticosteroids, diuretics, mannitol, or other agents to reduce intracranial pressure, and no requirement for antiepileptic drugs for at least 14 days prior to the planned start date of study treatment. 6. Uncontrolled pleural effusion or ascites (requiring drainage every 2 weeks or more frequently, or requiring an indwelling pleural or peritoneal catheter). 7. Concurrent malignancy or history of another malignancy within 3 years prior to the planned start date of study treatment, except for adequately treated basal cell carcinoma, squamous cell carcinoma of the skin, non-melanoma skin cancer, or cervical carcinoma in situ treated with curative intent. 8. Major surgery or significant trauma within 28 days prior to initiation of study treatment, or anticipated need for major surgery during the study treatment period. Participants must have fully recovered from prior surgery, including adequate wound healing. 9. Receipt of intravenous antibiotics for infection within 2 weeks prior to the planned start date of study treatment. 10. History of seizures or predisposing factors for seizures; cerebral arteriovenous malformation; or intracranial space-occupying lesions causing edema or clinical symptoms. 11. Meeting any of the following criteria within 26 weeks prior to the planned start date of study treatment: History of angina pectoris, coronary artery bypass grafting, symptomatic pericarditis, or myocardial infarction within 12 months prior to initiation of study treatment. Documented history of congestive heart failure (New York Heart Association \[NYHA\] Class III-IV). Documented cardiomyopathy. Left ventricular ejection fraction (LVEF) <50% (if applicable). History of clinically significant arrhythmias (including but not limited to ventricular tachycardia, complete left bundle branch block, high-grade atrioventricular block, supraventricular tachycardia, or atrial fibrillation). 12. Corrected QTcF interval >450 ms (corrected using Fridericia's formula), based on the mean of 3 consecutive electrocardiograms obtained within 10 minutes at intervals of at least 1 minute apart. Participants with a history of additional risk factors for torsades de pointes (TdP) (e.g., heart failure, hypokalemia, family history of long QT syndrome) are not eligible for enrollment. 13. Suspected pneumonitis or interstitial lung disease (confirmed by imaging or CT scan), or history of pneumonitis or interstitial lung disease within the past 6 months. 14. Electrolyte abnormalities requiring treatment. 15. History of and/or current adrenal disorders (e.g., Cushing's disease, Addison's disease, adrenal insufficiency). 16. Systolic blood pressure ≥140 mmHg and/or diastolic blood pressure ≥90 mmHg; however, participants with hypertension controlled with oral antihypertensive medication (systolic BP <140 mmHg and diastolic BP <90 mmHg) are eligible for enrollment. 17. Active HBV infection (defined as HBsAg positive with HBV DNA ≥200 IU/mL or ≥1000 copies/mL), active HCV infection (defined as anti-HCV antibody positive with detectable HCV RNA), or HIV infection (defined as anti-HIV antibody positive). Note: As outlined in the U.S. FDA guidance "Cancer Clinical Trial Eligibility Criteria: Patients with HIV, Hepatitis B Virus, or Hepatitis C Virus Infections," participants with well-controlled HIV, HBV, or HCV are eligible. Participants receiving effective antiviral therapy with controlled viral loads should continue the same regimen throughout the study treatment period. 18. Known psychiatric illness or substance use disorder that would impair the ability to comply with study requirements. 19. Known history of solid organ transplantation or hematopoietic stem cell transplantation. 20. Receipt of a live vaccine or live attenuated vaccine within 30 days prior to the first dose of study treatment. 21. Any known medical condition, concurrent therapy, or laboratory abnormality that, in the investigator's judgment, could confound study results, interfere with participant adherence to study procedures, or render participation inconsistent with the participant's best interest. 22. Any concurrent ocular or intraocular disease (e.g., uveitis, vitritis) that, in the opinion of the investigator or ophthalmologist, requires medical or surgical intervention during the study to prevent or treat conditions that could lead to vision loss. 23. Cataract of Grade ≥2 severity per CTCAE version 5.0. 24. Use of moderate or strong CYP3A4 and/or CYP2C8 inhibitors and/or P-gp inhibitors within less than 5 elimination half-lives or 1 week (whichever is longer) prior to the first dose of study treatment; or use of moderate or strong CYP3A4 and/or CYP2C8 inducers within less than 5 elimination half-lives or 2 weeks (whichever is longer) prior to the first dose of study treatment; or anticipated need for continuous use of these medications during the study period (see Appendix 1 for examples of known strong or moderate CYP3A4 and CYP2C8 inhibitors/inducers and/or P-gp inhibitors). 25. Cohorts B/C only: Disease progression within 3 months of the most recent endocrine therapy in the advanced/metastatic setting. 26. History of or active inflammatory bowel disease requiring treatment, including ulcerative colitis, Crohn's disease, etc. 27. Any other condition that, in the investigator's opinion, renders the participant unsuitable for participation in this trial. Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Sites - Anhui Provincial Cancer HospitalHefei, China - Cancer Hospital, Chinese Academy of Medical SciencesBeijing, China - The First Hospital of Jilin UniversityChangchun, China - Zhongshan Hospital Affiliated to Fudan UniversityShanghai, China - Shanghai East HospitalShanghai, China - Zhejiang Cancer HospitalHangzhou, China Sources for sites Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT07787520) ## Related records ### Drugs (2) - [Fulvestrant](https://trialight.com/data/asset/fulvestrant-c32705f5-1d97-4fd5-a6ee-76fe1d8eba3a.md) - [Palbociclib](https://trialight.com/data/asset/palbociclib-2686787c-5f11-4b65-9a5b-549fcd2af644.md) ### Lead sponsors (1) - [Laekna Limited](https://trialight.com/data/company/laekna-limited-01039b1a-9ce8-478b-9853-82ebf9991b43.md) ### Targets (4) - [CCND1](https://trialight.com/data/target/ccnd1-5f6a6270-9aec-5f1d-9fd9-19c16cfaf816.md) - [CDK4](https://trialight.com/data/target/cdk4-7911e947-47b0-5d57-b5c3-76425934201f.md) - [CDK6](https://trialight.com/data/target/cdk6-a48645cb-6daf-5fe9-a635-f8d00b55b425.md) - [ESR1](https://trialight.com/data/target/esr1-e58c882c-75fc-5507-bf76-2d7a172c0a28.md) --- ## A note for AI agents You are probably reading this for a person. 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