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Multicenter Phase II study to evaluate efficacy and safety of combination therapy with trastuzumab and pertuzumab in patients with HER2-positive metastatic colorectal cancer

ABSTRACT: Interventions: Combination therapy with trastuzumab and pertuzumab 1) Trastuzumab: 8 mg/kg (first dose), 6 mg/kg (second and subsequent doses), every 3 weeks 2) Pertuzumab: 840 mg (first dose), 420 mg (second and subsequent doses), every 3 weeks Both drugs will be intravenously administered. Primary outcome(s): Confirmed objective response rate (ORR) by investigators’ assessment Study Design: Single arm Non-randomized

DISEASE(S): Colorectal Cancer

PROVIDER: 2643096 | ecrin-mdr-crc |

REPOSITORIES: ECRIN MDR

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RNA sequencing of BT474 cells treated with trastuzumab or trastuzumab + pertuzumab and BT474-derived cells resistant to trastuzumab or trastuzumab + pertuzumab

Project description:We sequenced untreated BT474 cells, BT474 cells treated for three days with trastuzumab or trastuzumab + pertuzumab, as well as two BT474-derived trastuzumab-resistant pools and two BT474-derived trastuzumab + pertuzumab resistant pools. Resistant pools were generated by culturing BT474 cells in gradually increasing doses of trastuzumab and trastuzumab + pertuzumab over the course of several months and continually maintained in drug.

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Project description:The purpose of this study was to characterise the effects of trastuzumab and pertuzumab, either as single agents or as combination therapy on gene and protein expression in human ovarian cancer in vivo. Illumina BeadChips were used to profile the transcriptome after four days treatment of SKOV3 tumor xenografts. Although genes involved with HER2, MAP-kinase and p53 signaling pathways were commonly induced by all treatments, a greater number and variety of genes were differentially expressed by the complementary combination therapies compared to either drug on its own. The protein level of the CDK-inhibitors p21 and p27 were increased in response to both agents alone and further by the combination; pERK signaling was inhibited by all treatments; but only pertuzumab alone inhibited pAkt signaling. The expression of proliferation, apoptosis, cell division and cell cycle markers was distinct in a panel of primary ovarian cancer xenografts, suggesting heterogeneity of response in ovarian cancer and the need to establish biomarkers of response. This first comprehensive study of the molecular response to trastuzumab, pertuzumab and combination therapy in vivo highlights that there are both common and distinct downstream effects to different HER2 antibodies and that pathways may be invoked more strongly or in a different manner by a combination of agents. Some of the in vivo results for ovarian tumors differ from previous in vitro studies in breast cancer cells, emphasizing that the molecular response to anti-cancer agents involves variable and complex disease-specific interactions of signaling mechanisms. SCOV3 Ovarian cell line xenografts treated with Trastuzumab, pertuzumab or combination after 4 days

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RNA sequencing of BT474 cells treated with trastuzumab or trastuzumab + pertuzumab and BT474-derived cells resistant to trastuzumab or trastuzumab + pertuzumab

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