{"classes":[{"categories":[{"measurements":[{"groupId":"OG000","value":"5"},{"groupId":"OG001","value":"2"},{"groupId":"OG002","value":"3"},{"groupId":"OG003","value":"3"}]}],"title":"Post treatment on day 2"},{"categories":[{"measurements":[{"groupId":"OG000","value":"6"},{"groupId":"OG001","value":"6"},{"groupId":"OG002","value":"2"},{"groupId":"OG003","value":"3"}]}],"title":"Post treatment on day 3"}],"denoms":[{"counts":[{"groupId":"OG000","value":"6"},{"groupId":"OG001","value":"6"},{"groupId":"OG002","value":"3"},{"groupId":"OG003","value":"6"}],"units":"Participants"}],"description":"PBMCs were obtained from participants to determine a change in H2AX phosphorylation (named ƴH2AX) in peripheral blood mononuclear cells (PBMCs) when compared to baseline (day 1 pre-treatment). ƴH2AX was detected by immunochemistry (microscopy) by using an antibody specific against ƴH2AX that, in turn, was detected by a secondary antibody conjugated to a fluorescent probe. Changes in ƴH2AX levels in PBMCs is defined as changes in numbers of ƴH2AX foci per cells.","groups":[{"description":"Phase I Dose Level (DL) 1 Topotecan 1mg/m\\^2 intravenous (IV) (days 1-5); VX970 (M6620) 140mg/m\\^2 IV on day 5","id":"OG000","title":"Phase I DL1 Topotecan 1mg/m^2 Intravenous (IV) (Days 1-5); VX970 (M6620) 140mg/m^2 IV on Day 5"},{"description":"Phase I Dose Level (DL) 2 Topotecan 1mg/m\\^2 intravenous (IV) (days 1-5); VX970 (M6620) 140mg/m\\^2 IV on day 2, 5","id":"OG001","title":"Phase I DL2 Topotecan 1mg/m^2 Intravenous (IV) (Days 1-5); VX970 (M6620) 140mg/m^2 IV on Day 2, 5"},{"description":"Phase I Dose Level (DL) 3 Topotecan 1.25mg/m\\^2 intravenous (IV) (days 1-5); VX970 (M6620) 140mg/m\\^2 IV on day 2, 5","id":"OG002","title":"Phase I DL3 Topotecan 1.25mg/m^2 Intravenous(IV) (Days 1-5); VX970 (M6620) 140mg/m^2 IV on Day 2, 5"},{"description":"Phase I Dose Level (DL) 4 Topotecan 1.25mg/m\\^2 intravenous (IV) (days 1-5); VX970 (M6620) 210mg/m\\^2 IV on day 2, 5","id":"OG003","title":"Phase I DL4 Topotecan 1.25mg/m^2 Intravenous(IV) (Days 1-5); VX970 (M6620) 210mg/m^2 IV on Day 2, 5"}],"paramType":"COUNT_OF_PARTICIPANTS","reportingStatus":"POSTED","timeFrame":"Day 1 Pre-Treatment, Post treatment on day 2, and Post treatment on day 3","title":"Phase I: Number of Participants With a Change in H2AX Phosphorylation (ƴH2AX) Levels in Peripheral Blood Mononuclear Cells (PBMCs) From Baseline (Day 1 Pre-Treatment)","type":"SECONDARY","unitOfMeasure":"Participants"}