RE: More US sites31 Aug 2023 13:36
@Rorydinho, yes, the wording in the RNS of 21 June makes it clear that patients in at least 2 of the UK-based cohorts have responded during treatment ("several patients in cohort 5 and earlier cohorts remain on treatment as their disease has not progressed").
Oncology Phase 1, certainly Phase 1a, studies are always done on terminally ill patients for ethical reasons because non-terminal patients still have 'proven' lines of treatment available to them and the purpose is to test a previously unstudied drug for safety and tolerability and to characterise the PK and PD of the drug, not to trial the efficacy of this unstudied drug as a treatment.
Whilst AVA6000 seems to have shown clear efficacy, there are problems with reporting this: 1) the small sample sizes are not statistically meaningful; 2) the patients have (most likely) been pretreated with other lines of treatment for their various, different cancers; and possibly 3) the variable susceptibility of different cancers to doxorubicin.
Avacta will be free to publish any data they like (that can't be tied to individual named patients) but at this stage, Phase 1a, it will, for the reasons given above, be annecdotal as regards responses to treatment. Nevertheless, Avacta can certainly cite the number of patients who have benefitted from the trial and how they have benefitted and no doubt point to these as indicators that AVA6000 is on course to provide good data in these Secondary Outcome Measures of the trial when stsatistically significant data have been collected in Phase 1b/2:
Objective response rate (ORR) [ Time Frame: Up to one year ]
ORR is defined as the proportion of patients achieving a best overall response of confirmed partial responses (PR) or complete response (CR), per Response Evaluation Criteria in Solid Tumors (RECIST 1.1).
Duration of Response (DoR) [ Time Frame: Up to one year ]
DoR is defined as the duration of time from date of first response to date of disease progression, as per RECIST v1.1
Progression-free-survival (PFS) [ Time Frame: Up to one year ]
PFS is defined as the time from the date of the first dose to the date of the first documentation of confirmed disease progression or death, whichever occurs first, as per RECIST v1.1
Overall survival (OS) [ Time Frame: Up to one year ]
Overall survival (OS), defined as the date of first dose) to the occurrence of death from any cause