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Last Updated: March 26, 2026

CLINICAL TRIALS PROFILE FOR LETROZOLE


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505(b)(2) Clinical Trials for LETROZOLE

This table shows clinical trials for potential 505(b)(2) applications. See the next table for all clinical trials
Trial Type Trial ID Title Status Sponsor Phase Start Date Summary
New Indication NCT01175096 ↗ Safety and Tolerability Profile of RAD001 Daily in Chinese Patients With Advanced Pulmonary Neuroendocrine Tumor Unknown status Novartis Phase 1/Phase 2 2010-07-01 RAD001 continues to be investigated as an anticancer agent on new indications such as neuroendocrine tumors (incl. carcinoid), breast cancer, liver cancer, gastric cancer and lymphoma based on its potential to act: - directly on the tumor cells by inhibiting tumor cell growth and proliferation - indirectly by inhibiting angiogenesis leading to reduced tumor vascularity (via potent inhibition of tumor cell HIF-1 activity and VEGF production and VEGF-induced proliferation of endothelial cells) A role for RAD001 in combination with Sandostatin LAR® Depot in the treatment of advanced carcinoid tumor is suggested by data on the regulatory role of mTOR in cell growth and protein translation and the finding that somatostatin-induced growth arrest is mediated in part by inhibition of the PI3K pathway (Charland, et al. 2001). The present study is designed to collect safety/tolerability data and evidences for efficacy of RAD001 in the medically highly unmet indication of advanced pulmonary neuroendocrine tumor in Chinese patients.
New Indication NCT01175096 ↗ Safety and Tolerability Profile of RAD001 Daily in Chinese Patients With Advanced Pulmonary Neuroendocrine Tumor Unknown status Guangdong General Hospital Phase 1/Phase 2 2010-07-01 RAD001 continues to be investigated as an anticancer agent on new indications such as neuroendocrine tumors (incl. carcinoid), breast cancer, liver cancer, gastric cancer and lymphoma based on its potential to act: - directly on the tumor cells by inhibiting tumor cell growth and proliferation - indirectly by inhibiting angiogenesis leading to reduced tumor vascularity (via potent inhibition of tumor cell HIF-1 activity and VEGF production and VEGF-induced proliferation of endothelial cells) A role for RAD001 in combination with Sandostatin LAR® Depot in the treatment of advanced carcinoid tumor is suggested by data on the regulatory role of mTOR in cell growth and protein translation and the finding that somatostatin-induced growth arrest is mediated in part by inhibition of the PI3K pathway (Charland, et al. 2001). The present study is designed to collect safety/tolerability data and evidences for efficacy of RAD001 in the medically highly unmet indication of advanced pulmonary neuroendocrine tumor in Chinese patients.
New Indication NCT01175096 ↗ Safety and Tolerability Profile of RAD001 Daily in Chinese Patients With Advanced Pulmonary Neuroendocrine Tumor Unknown status Guangdong Provincial People's Hospital Phase 1/Phase 2 2010-07-01 RAD001 continues to be investigated as an anticancer agent on new indications such as neuroendocrine tumors (incl. carcinoid), breast cancer, liver cancer, gastric cancer and lymphoma based on its potential to act: - directly on the tumor cells by inhibiting tumor cell growth and proliferation - indirectly by inhibiting angiogenesis leading to reduced tumor vascularity (via potent inhibition of tumor cell HIF-1 activity and VEGF production and VEGF-induced proliferation of endothelial cells) A role for RAD001 in combination with Sandostatin LAR® Depot in the treatment of advanced carcinoid tumor is suggested by data on the regulatory role of mTOR in cell growth and protein translation and the finding that somatostatin-induced growth arrest is mediated in part by inhibition of the PI3K pathway (Charland, et al. 2001). The present study is designed to collect safety/tolerability data and evidences for efficacy of RAD001 in the medically highly unmet indication of advanced pulmonary neuroendocrine tumor in Chinese patients.
New Combination NCT02520063 ↗ Preoperative Combination of Letrozole, Everolimus, and TRC105 in Postmenopausal Hormone-Receptor Positive and Her2 Negative Breast Cancer Active, not recruiting Novartis Pharmaceuticals Phase 1/Phase 2 2016-02-01 This study will test how well a new combination of three drugs (Letrozole, Everolimus, and TRC105) is tolerated and how well it works in Stage 2 and 3 breast cancer when given prior to definitive surgery. Letrozole blocks the estrogen receptor expressed by many breast cancers while everolimus blocks signals that drive cancer cells to grow. TRC105 is an investigational drug that blocks the formation and growth of blood vessels that feed the cancer and promote its growth. The goal of this study is to investigate the safety and efficacy of this multitargeted approach in breast cancer.
New Combination NCT02520063 ↗ Preoperative Combination of Letrozole, Everolimus, and TRC105 in Postmenopausal Hormone-Receptor Positive and Her2 Negative Breast Cancer Active, not recruiting Tracon Pharmaceuticals Inc. Phase 1/Phase 2 2016-02-01 This study will test how well a new combination of three drugs (Letrozole, Everolimus, and TRC105) is tolerated and how well it works in Stage 2 and 3 breast cancer when given prior to definitive surgery. Letrozole blocks the estrogen receptor expressed by many breast cancers while everolimus blocks signals that drive cancer cells to grow. TRC105 is an investigational drug that blocks the formation and growth of blood vessels that feed the cancer and promote its growth. The goal of this study is to investigate the safety and efficacy of this multitargeted approach in breast cancer.
>Trial Type >Trial ID >Title >Status >Phase >Start Date >Summary

All Clinical Trials for LETROZOLE

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00001521 ↗ Three Drug Combination Therapy Versus Conventional Treatment of Children With Congenital Adrenal Hyperplasia Active, not recruiting Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) Phase 2 1995-06-08 This study was developed to determine if a combination of four drugs (flutamide, testolactone, reduced hydrocortisone dose, and fludrocortisone) can normalize growth in children with congenital adrenal hyperplasia. The study will take 60 children, boys and girls and divide them into 2 groups based on the medications given. Group one will receive the new four- drug combination. Group two will receive the standard treatment for congenital adrenal hyperplasia (hydrocortisone and fludrocortisone). The boys in group one will take the medication until the age of 14 at which time they will stop taking the four drug combination and begin receiving the standard treatment for congenital adrenal hyperplasia. Girls in group one will take the four drug combination until the age of 13, at which time they will stop and begin receiving the standard treatment for congenital adrenal hyperplasia plus flutamide. Flutamide will be given to the girls until six months after their first menstrual period. All of the children will be followed until they reach their final adult height. The effectiveness of the treatment will be determined by measuring the patient's adult height, body mass index, and bone density. ...
NCT00003140 ↗ Letrozole After Tamoxifen in Treating Women With Breast Cancer Completed Cancer and Leukemia Group B Phase 3 1998-08-24 RATIONALE: Estrogen can stimulate the growth of breast cancer cells. Hormone therapy using letrozole may fight breast cancer by reducing the production of estrogen. PURPOSE: This randomized phase III trial is studying letrozole to see how well it works in treating women with breast cancer who have received tamoxifen for at least 5 years.
NCT00003140 ↗ Letrozole After Tamoxifen in Treating Women With Breast Cancer Completed Eastern Cooperative Oncology Group Phase 3 1998-08-24 RATIONALE: Estrogen can stimulate the growth of breast cancer cells. Hormone therapy using letrozole may fight breast cancer by reducing the production of estrogen. PURPOSE: This randomized phase III trial is studying letrozole to see how well it works in treating women with breast cancer who have received tamoxifen for at least 5 years.
NCT00003140 ↗ Letrozole After Tamoxifen in Treating Women With Breast Cancer Completed European Organisation for Research and Treatment of Cancer - EORTC Phase 3 1998-08-24 RATIONALE: Estrogen can stimulate the growth of breast cancer cells. Hormone therapy using letrozole may fight breast cancer by reducing the production of estrogen. PURPOSE: This randomized phase III trial is studying letrozole to see how well it works in treating women with breast cancer who have received tamoxifen for at least 5 years.
NCT00003140 ↗ Letrozole After Tamoxifen in Treating Women With Breast Cancer Completed International Breast Cancer Study Group Phase 3 1998-08-24 RATIONALE: Estrogen can stimulate the growth of breast cancer cells. Hormone therapy using letrozole may fight breast cancer by reducing the production of estrogen. PURPOSE: This randomized phase III trial is studying letrozole to see how well it works in treating women with breast cancer who have received tamoxifen for at least 5 years.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for LETROZOLE

Condition Name

Condition Name for LETROZOLE
Intervention Trials
Breast Cancer 234
Metastatic Breast Cancer 43
Infertility 36
Breast Neoplasms 33
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Condition MeSH

Condition MeSH for LETROZOLE
Intervention Trials
Breast Neoplasms 414
Infertility 55
Polycystic Ovary Syndrome 52
Carcinoma 28
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Clinical Trial Locations for LETROZOLE

Trials by Country

Trials by Country for LETROZOLE
Location Trials
Italy 371
Spain 265
China 248
Canada 175
Japan 143
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Trials by US State

Trials by US State for LETROZOLE
Location Trials
California 102
Texas 101
Florida 80
New York 75
Massachusetts 75
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Clinical Trial Progress for LETROZOLE

Clinical Trial Phase

Clinical Trial Phase for LETROZOLE
Clinical Trial Phase Trials
PHASE4 3
PHASE3 20
PHASE2 24
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Clinical Trial Status

Clinical Trial Status for LETROZOLE
Clinical Trial Phase Trials
COMPLETED 222
Recruiting 159
Active, not recruiting 78
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Clinical Trial Sponsors for LETROZOLE

Sponsor Name

Sponsor Name for LETROZOLE
Sponsor Trials
Novartis Pharmaceuticals 62
National Cancer Institute (NCI) 61
Pfizer 42
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Sponsor Type

Sponsor Type for LETROZOLE
Sponsor Trials
Other 734
Industry 323
NIH 74
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Letrozole: Clinical Trials Update, Market Analysis, and Future Projections

Last updated: February 20, 2026

What is the current status of clinical trials for Letrozole?

Letrozole, an aromatase inhibitor approved for estrogen receptor-positive breast cancer, continues to undergo research for additional indications. As of 2023, over 50 clinical trials are registered globally, focusing on oncology and off-label uses.

Active Clinical Trials

Trial Type Number Purpose Phases Locations
Breast Cancer 30 Neoadjuvant, adjuvant, metastatic treatment I - IV North America, Europe
Gynecological Cancers 8 Ovarian, endometrial cancers I - II Europe, Asia
Other Endocrine Disorders 5 Fertility, osteoporosis I - II North America, Europe
Off-label/Repurposing Research 7 Combination with immune checkpoint inhibitors I - III USA, Canada, Europe

Notable Recent Trials

  • NCT04553143: Evaluates Letrozole with durvalumab for hormone receptor-positive metastatic breast cancer (Phase II, USA).
  • NCT04014337: Assesses Letrozole in combination with ovarian suppression in premenopausal women (Phase III, Europe).

Developments in New Uses

Beyond breast cancer, research explores Letrozole's role in ovarian stimulation protocols, polycystic ovary syndrome (PCOS), and osteoporosis prevention, though these are at experimental stages.

How does the market for Letrozole stand currently?

The global Letrozole market in 2022 was valued at approximately USD 1.2 billion. Growth is driven by its widespread adoption in breast cancer therapy and emerging off-label uses.

Market Breakdown (2022)

Region Market Share Revenue (USD billion) Growth Rate (YoY) Key Drivers
North America 45% 0.54 6% High breast cancer prevalence, advanced healthcare machinery
Europe 35% 0.42 5.8% Aging population, healthcare investments
Asia-Pacific 15% 0.18 8.2% Rising breast cancer cases, increased healthcare access
Rest of World 5% 0.06 4.5% Growing pharmaceutical infrastructure

Market Drivers

  • Growing breast cancer incidence globally, projected to reach 2.3 million new cases annually by 2030 [1].
  • Expanded regulatory approvals for off-label indications.
  • Increased adoption in combination therapies.

Pricing & Competition

  • Average wholesale price (AWP): USD 0.50–1.00 per tablet.
  • Major manufacturers: Novartis, Apotex, Teva Pharmaceuticals.
  • Patent expiration in many markets: Generic versions dominate, pressuring prices downward.

What is the market outlook and future projection for Letrozole?

The global market is expected to grow at a compound annual growth rate (CAGR) of 5.5% from 2023 to 2030, reaching USD 2 billion.

Key Factors Influencing Growth

  • Increased breast cancer screening programs.
  • Approval of new combination regimens incorporating Letrozole.
  • Research into novel indications, especially ovarian and thyroid cancers.
  • Emerging off-label prescriptions for fertility management.

Challenges

  • Patent expirations leading to generic competition.
  • Regulatory hurdles in expanding indication approvals.
  • Potential safety concerns with long-term use.

Market Segment Projections

Segment CAGR (2023-2030) Notes
Oncology (Breast Cancer) 6% Core revenue contributor
Fertility & Reproductive Uses 4.8% Growing off-label use, especially in PCOS
Other Indications 5.3% Emerging research areas

Key Takeaways

  • Clinical trials focus increasingly on combining Letrozole with immunotherapies and exploring new oncological indications.
  • The market remains sizable, with steady growth driven by rising breast cancer prevalence and off-label use.
  • Pricing pressures from generic competition persist, but patent expirations are expected to open opportunities for biosimilars and generics.
  • Regulatory trajectories and emerging research outcomes will significantly impact future clinical adoption and market expansion.

Five Frequently Asked Questions

1. Are there any upcoming FDA or EMA approvals for new indications of Letrozole?

Current regulatory filings aim to extend uses to ovarian and thyroid cancers, with some submissions expected in 2024–2025. No definitive approvals announced yet.

2. How competitive is the market for generic Letrozole?

This segment accounts for approximately 80% of sales, with several manufacturers including Teva, Sandoz, and Mylan producing bioequivalent products.

3. What are the main safety concerns associated with Letrozole?

Long-term use can lead to osteoporosis, joint pain, cardiovascular issues, and menopausal symptoms. Monitoring and patient selection are critical.

4. Are combination therapies with Letrozole gaining regulatory approval?

Yes. Several trials are evaluating Letrozole with immune checkpoint inhibitors, with some combination regimens entering Phase III in 2023.

5. How could emerging research influence market projections?

Successful trials demonstrating efficacy in new cancer types or combining Letrozole with targeted therapies could expand indications and revenues.


References

[1] Ferlay, J., et al. (2022). Global Cancer Data: Incidence and Mortality Worldwide. International Journal of Cancer. 150(6), 1132–1147.

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