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    DRUG:

    letrozole

    i
    Other names: CGP 20267, CGS 20267, CGS20267
    Company:
    Generic mfg.
    Drug class:
    Aromatase inhibitor
    Related drugs:
    13h
    MONARCH plus: A Study of Abemaciclib (LY2835219) in Participants With Breast Cancer (clinicaltrials.gov)
    P3, N=463, Active, not recruiting, Eli Lilly and Company | Trial completion date: Jan 2027 --> Mar 2028
    Trial completion date
    |
    HER-2 (Human epidermal growth factor receptor 2) • ER (Estrogen receptor) • PGR (Progesterone receptor)
    |
    HER-2 overexpression • HER-2 negative
    |
    Verzenio (abemaciclib) • fulvestrant • letrozole • anastrozole
    14h
    A Study of HRS-6208 in Combination With HRS-8080, or Fulvestrant, or Letrozole, With or Without HRS-6209 in Patients With Advanced Unresectable or Metastatic Breast Cancer (clinicaltrials.gov)
    P1/2, N=180, Not yet recruiting, Shandong Suncadia Medicine Co., Ltd.
    New P1/2 trial
    |
    fulvestrant • letrozole
    18h
    Testing Low Dose Tamoxifen for Invasive Breast Cancer, the (LoTam) Trial (clinicaltrials.gov)
    P3, N=1156, Suspended, Alliance for Clinical Trials in Oncology | Recruiting --> Suspended
    Trial suspension
    |
    HER-2 (Human epidermal growth factor receptor 2)
    |
    ER positive • HER-2 negative • HER-2 negative + ER positive
    |
    Prosigna™ Breast Cancer Prognostic Gene Signature Assay • Oncotype DX Breast Recurrence Score®Test
    |
    tamoxifen • letrozole • anastrozole • exemestane
    23h
    IMPULSE: Implementation Study to Describe and Compare Retention Rate and Adherence to Adjuvant Therapy With Ribociclib With and Without Usage of Mobile Application in Patients With HR+ HER2-negative Stage II and III Breast Cancer in Real-world Practice (clinicaltrials.gov)
    P=N/A, N=240, Recruiting, Novartis Pharmaceuticals | Not yet recruiting --> Recruiting | Trial completion date: Jul 2029 --> Dec 2029 | Initiation date: Jul 2025 --> Jan 2026 | Trial primary completion date: Jul 2029 --> Dec 2029
    Enrollment open • Trial completion date • Trial initiation date • Trial primary completion date • Real-world evidence
    |
    HER-2 (Human epidermal growth factor receptor 2)
    |
    HER-2 positive • HR positive • HER-2 negative • HR positive + HER-2 negative
    |
    Kisqali (ribociclib) • letrozole • anastrozole
    3d
    De-Escalation of Breast Radiation Trial for Hormone Sensitive, HER-2 Negative, Oncotype Recurrence Score Less Than or Equal to 18 Breast Cancer (DEBRA) (clinicaltrials.gov)
    P3, N=1670, Recruiting, NRG Oncology | Trial primary completion date: Jan 2026 --> Apr 2026
    Trial primary completion date
    |
    HER-2 (Human epidermal growth factor receptor 2) • PGR (Progesterone receptor)
    |
    HER-2 negative • PGR positive
    |
    MammaPrint® • Oncotype DX Breast Recurrence Score®Test
    |
    tamoxifen • letrozole • exemestane
    3d
    MONARCH 3: A Study of Nonsteroidal Aromatase Inhibitors Plus Abemaciclib (LY2835219) in Postmenopausal Women With Breast Cancer (clinicaltrials.gov)
    P3, N=493, Active, not recruiting, Eli Lilly and Company | Trial completion date: Dec 2025 --> Dec 2026
    Trial completion date
    |
    HER-2 (Human epidermal growth factor receptor 2)
    |
    HR positive • HER-2 negative
    |
    Verzenio (abemaciclib) • letrozole • anastrozole
    5d
    Emulation of the PALOMA-2 Trial (clinicaltrials.gov)
    P=N/A, N=6097, Active, not recruiting, Brigham and Women's Hospital | Trial completion date: Oct 2025 --> Mar 2026 | Trial primary completion date: Oct 2025 --> Mar 2026
    Trial completion date • Trial primary completion date
    |
    HER-2 (Human epidermal growth factor receptor 2) • ER (Estrogen receptor)
    |
    ER positive • HER-2 negative • HER-2 negative + ER positive
    |
    Ibrance (palbociclib) • letrozole
    6d
    Clinical Study of Jinfeng Pill and Letrozole Combination Therapy for PCOS-Related Infertility (ChiCTR2600117547)
    P=N/A, N=264, Not yet recruiting, Shanghai First Maternity and Infant Hospital; Shanghai First Maternity and Infant Hospital
    New trial
    |
    letrozole
    6d
    Randomized Controlled Trial Comparing Letrozole-Induced Ovulation Versus Natural Cycle Single-Blastocyst Frozen Embryo Transfer on Pregnancy Outcomes in Normally Ovulatory Women (ChiCTR2500114189)
    P=N/A, N=352, Recruiting, Beijing Chao-Yang Hospital, Capital Medical University; Beijing Chao-Yang Hospital, Capital Medical University
    New trial
    |
    letrozole
    6d
    The Effect of Estrogen Supplementation on Clinical Pregnancy Rate in Letrozole-Induced Ovulation: A Prospective Randomized Controlled Trial (ChiCTR2500115444)
    P4, N=420, Not yet recruiting, Dongguan People's Hospital; Dongguan People's Hospital
    New P4 trial
    |
    letrozole
    6d
    A Multicenter Randomized Controlled Clinical Trial of Neoadjuvant Endocrine Therapy versus Chemotherapy in Patients with HR+/HER2- Early-Stage Breast Cancer (ChiCTR2500111780)
    P4, N=148, Not yet recruiting, Sun Yat-sen Memorial Hospital, Sun Yat-sen University; Sun Yat-sen Memorial Hospital, Sun Yat-sen University
    New P4 trial
    |
    HER-2 (Human epidermal growth factor receptor 2) • ER (Estrogen receptor) • PGR (Progesterone receptor)
    |
    ER positive • HER-2 negative • PGR positive • HER-2 negative + AR positive + ER positive • HER-2 negative + ER positive
    |
    paclitaxel • cyclophosphamide • Kisqali (ribociclib) • letrozole • epirubicin • goserelin acetate
    7d
    Marked Palliative Benefits Seen With Treatment of Very Advanced Breast Cancer With the Progesterone Receptor Modulator Mifepristone. (PubMed, Anticancer Res)
    Mifepristone provided marked palliative benefit in this patient with nPR-negative, metastatic breast cancer, suggesting potential therapeutic value in similar cases. Confirmation of efficacy will require larger studies focused on tumors with absent or minimal nuclear progesterone receptor expression.
    Journal
    |
    ER (Estrogen receptor) • PGR (Progesterone receptor)
    |
    Verzenio (abemaciclib) • Kisqali (ribociclib) • letrozole • Mifeprex (mifepristone)