Abbreviated Title : CUPem Clinical Indication : A Phase II, Two-Stage, Trial of Pembrolizumab in Cancer of unknown primary Trial Type : Single Arm, non-randomised; Two-stage; Hypothesis generating Type of control : None Route of administration : IV Trial Blinding : N/A Treatment Groups :Two cohorts: (i) First Cohort: One or more lines of prior therapy (ii) Second Cohort: First Line untreated CUP patients Number of trial subjects : i) First Cohort: 20 ii) Second Cohort: 57 Eligibility Criteria : The Eligibility Criteria are the same as used in the A trial of chemotherapy for cancer of unknown primary (CUP-ONE) trial in the United Kingdom (UK), please see below. * Histologically confirmation of a diagnosis of CUP, with imaging and all diagnostic investigations confirmed as CUP within a CUP Multidisciplinary Team (MDT). * Eastern Cooperative Oncology Group (ECOG) Performance Status 0-2 * Patients must have disease that is not amenable to potentially curative options such as resection or radical radiotherapy * If patient's disease presentation precludes tumour biopsy (inaccessible or biopsy thought not to be in the patient's best interest), the patient is not study eligible. Estimated recruitment period : 2 years Estimated duration of trial : 3.9 years including set up, recruitment, follow up and close down. Duration of Participation : Cohort 1 = 6-8 months; Cohort 2 = 8-18 months Estimated average length of treatment per patient =6 months
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Overall Response Rate (ORR) by RECIST Criteria v1.1 in the Second-line & First-line Setting.
Timeframe: From the start of the study treatment until the end of treatment, an average of 6-8 months.