AstraZeneca Plc and Daiichi Sankyo Co. announced that their cancer treatment, Enhertu, has delayed the growth of a common type of breast cancer by more than a year in a large late-stage trial. This development offers new hope for patients suffering from this aggressive form of the disease.
Key Findings
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Effectiveness of Enhertu:
- When used as an initial treatment, Enhertu reduced the risk of worsening or death from HER2-positive breast cancer within 18 months by 34% compared to chemotherapy alone.
- The median time for cancer progression was approximately 11 months with Enhertu, compared to about 6 months with chemotherapy.
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Patient Impact:
- David Fredrickson, executive vice president of AstraZeneca’s oncology business unit, highlighted that one in three patients starting treatment for this type of cancer cannot receive a second therapy due to health deterioration or death. He expressed optimism that Enhertu could significantly improve these outcomes.
Current Approvals and Mechanism
- Enhertu is already approved as an initial treatment for HER2-positive stomach and esophageal cancers.
- The drug works by targeting HER2 receptors, which are proteins found on certain tumor types.
Related Developments in Cancer Treatments
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Pfizer Inc.’s Braftovi:
- This pill has doubled survival time for patients with an aggressive form of colorectal cancer compared to standard treatment in late-stage trials.
- It targets the BRAF V600E mutation, which is present in 10% to 15% of colorectal cancer patients. The survival rate for these patients is notably low, with just over half living five years post-diagnosis.
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Gilead Sciences Inc.’s Trodelvy:
- Trodelvy has shown promising results as an initial treatment in combination with Merck & Co.’s Keytruda for triple-negative breast cancers (TNBC), reducing the risk of disease worsening by 35%.
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Merck & Co.:
- Recently withdrew its US application for a treatment after it failed a key test.
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Amgen Inc.’s Imdeltyra:
- This drug has been shown to reduce the risk of death among small-cell lung cancer patients whose disease worsened after initial chemotherapy, according to data from a late-stage trial.
These advancements in cancer treatment highlight the ongoing efforts to improve patient outcomes and provide new therapeutic options for aggressive cancer types.

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