April 2021, Vol 12, No 2

The HER2-targeted bispecific investigational antibody zanidatamab, either as monotherapy or in combination with chemotherapy, has shown promising antitumor activity in an ongoing phase 1 study of patients with HER2-expressing biliary tract cancer or gastroesophageal adenocarcinoma, reported Funda Meric-Bernstam, MD, Chair, Department of Investigational Cancer Therapeutics, M.D. Anderson Cancer Center, Houston, TX, at the 2021 ASCO Gastrointestinal Cancers Symposium.
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A small-molecule CD73 inhibitor (AB680) induced a 41% overall response rate (ORR) when combined with chemotherapy (with nab-paclitaxel and gemcitabine), plus the novel PD-1 inhibitor zimberelimab, as a first-line treatment for patients with metastatic pancreatic ductal adenocarcinoma, according to results of the dose-escalation portion of a phase 1/1b study known as ARC-8.
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Pembrolizumab (Keytruda) plus chemotherapy improved progression-free survival (PFS) compared with chemotherapy alone as first-line treatment of metastatic triple-negative breast cancer (TNBC), according to the results of KEYNOTE-355. Improvement in PFS with the addition of pembrolizumab to chemotherapy was more robust in patients with TNBC and PD-L1 expression. These results from KEYNOTE-355 were presented at the 2020 San Antonio Breast Cancer Symposium (SABCS) and add to a growing body of evidence supporting the first-line use of pembrolizumab plus chemotherapy combinations for TNBC.
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Sacituzumab govitecan (Trodelvy) led to increased response rates and improved progression-free survival (PFS) compared with chemotherapy in heavily pretreated patients with metastatic triple-negative breast cancer (TNBC) and stable brain metastases, according to a subgroup analysis of the phase 3 ASCENT clinical trial. The drug did not lead to improved overall survival (OS) in patients with stable brain metastases. These results were presented at the 2020 San Antonio Breast Cancer Symposium (SABCS).
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Cabazitaxel (Jevtana) is approved as third-line therapy for patients with metastatic castration-resistant prostate cancer (CRPC) after treatment with docetaxel and an androgen receptor inhibitor. A new phase 2 clinical trial shows that the radionuclide therapy that targets the prostate-specific membrane antigen (PSMA), 177Lu-PSMA-617, reduced the risk for disease progression or death by 37% compared with cabazitaxel in men with previously treated metastatic CRPC. Moreover, the TheraP study showed that patients who received 177Lu-PSMA-617 had fewer side effects and improved quality of life compared with patients who received cabazitaxel.
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The combination of nivolumab (Opdivo) plus cabozantinib (Cabometyx) continued to show superior survival outcomes compared with single-agent sunitinib (Sutent) as first-line treatment for patients with advanced renal-cell carcinoma (RCC), according to extended follow-up data from the phase 3 CheckMate-9ER clinical trial presented at the 2021 ASCO Genitourinary (GU) Cancers Symposium.
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