A Study of Nemtabrutinib (MK-1026) in China Participants With Relapsed or Refractory Hematologic Malignancies (MK-1026-005)

ORR per iwCLL criteria 2018 is defined as the percentage of participants achieving a complete response (CR), complete response with incomplete bone marrow (BM) recovery (CRi), nodular partial response (nPR) or partial response (PR). CR is defined as meeting the following criteria: no lymph nodes ≥1.5 cm, spleen size <13 cm, liver normal; no constitutional symptoms, normal lymphocyte count, platelets ≥100 x 10^9/L; hemoglobin ≥11 g/dL; and normocellular marrow (no CLL cells or B lymphoid nodules). CRi is defined as meeting CR criteria but with incomplete bone marrow recovery. nPR is defined as having features of CR but with lymphoid nodules in the marrow. PR is defined as ≥50% decrease in ≥2 of the following: lymph nodes, liver and/or spleen size, lymphocytes PLUS ≥1 of the following met: platelets ≥100 x 10^9/L or >50% increase from screening, hemoglobin ≥11 g/dL or >50% increase from screening, CLL cells or B lymphoid nodules in marrow.

ORR per IWWM criteria 2014 is defined as the percentage of participants achieving a CR, very good partial response (VGPR), or PR. CR is defined as all lymph nodes are normal in size (none ≥15 mm), liver and spleen normal in size, serum immunoglobulin M (IgM) values in the normal range, disappearance of monoclonal protein by immunofixation (confirmation needed with a second immunofixation at any subsequent timepoint), and no histological evidence of BM involvement. VGPR is defined as ≥50% decrease from baseline in sum of product of diameter (SPD) of lymph nodes (if abnormal at baseline) ≥50% decrease from baseline in the abnormal portion of the spleen (if previously abnormal) and ≥90% decrease from baseline in serum IgM or serum IgM values in normal range. PR is defined as ≥50% decrease from baseline in SPD of lymph nodes (if abnormal at baseline) ≥50% decrease from baseline in serum IgM and ≥50% decrease from baseline in the abnormal portion of the spleen (if previously abnormal).

ORR per Lugano criteria 2014 is defined as the percentage of participants achieving a CR or PR. CR defined as EITHER CR by imaging (computed tomography [CT]): all lymph nodes normal (none ≥15 mm) and normal liver and spleen OR complete metabolic response (CMR): assessing fluorodeoxyglucose (FDG) metabolic activity in lymphomatous lesions AND bone marrow normal by morphology. PR defined as EITHER PR by imaging (CT) with ≥50% decrease in the SPD of target lesions, no worsening of nontarget lesions, no new lesions and ≥50% spleen abnormal portion OR Partial Metabolic Response (PMR) with no new lesions and decreased overall uptake AND residual BM abnormalities; OR CR by imaging with residual BM abnormalities; OR PR by imaging without residual BM abnormalities.

For participants with CR, CRi, nPR, or PR per iwCLL 2018 criteria, DOR is defined as the time from the first documented evidence of objective response until disease progression or death due to any cause, whichever occurs first. CR is defined as meeting the following criteria: no lymph nodes ≥1.5 cm, spleen size <13 cm, liver normal; no constitutional symptoms, normal lymphocyte count, platelets ≥100 x 10^9/L; hemoglobin ≥11 g/dL; and normocellular marrow (no CLL cells or B lymphoid nodules). CRi is defined as meeting CR criteria but with hypocellular bone marrow. nPR is defined as having features of CR but with lymphoid nodules in the marrow. PR is defined as ≥50% decrease in ≥2 of the following: lymph nodes, liver and/or spleen size, lymphocytes PLUS ≥1 of the following met: platelets ≥100 x 10^9/L or >50% increase from screening, hemoglobin ≥11 g/dL or >50% increase from screening, CLL cells or B lymphoid nodules in marrow.

For participants with CR, VGPR, or PR per IWWM criteria 2014, DOR defined as the time from first documented evidence of objective response until PD or death due to any cause, whichever occurs first. CR defined as all lymph nodes normal in size (none ≥15 mm), liver and spleen normal in size, serum IgM values in normal range, disappearance of monoclonal protein by immunofixation (confirmation needed with second immunofixation at any subsequent timepoint), and no histological evidence of BM involvement. VGPR defined as ≥50% decrease from baseline in SPD of lymph nodes (if abnormal at baseline), ≥50% decrease from baseline in abnormal portion of the spleen (if previously abnormal), and ≥90% decrease from baseline in serum IgM, or serum IgM values in normal range. PR is defined as ≥50% decrease from baseline in SPD of lymph nodes (if abnormal at baseline), ≥50% decrease from baseline in serum IgM, and ≥50% decrease from baseline in abnormal portion of the spleen (if previously abnormal).

For participants with CR or PR per Lugano criteria 2014, DOR is defined as the time from the first documented evidence of objective response until PD or death due to any cause, whichever occurs first. CR defined as EITHER CR by imaging (CT): all lymph nodes normal (none ≥15 mm) and normal liver and spleen OR CMR: assessing FDG metabolic activity in lymphomatous lesions AND BM normal by morphology. PR defined as EITHER PR by imaging (CT) with ≥50% decrease in the SPD of target lesions, no worsening of nontarget lesions, no new lesions and ≥50% spleen abnormal portion OR PMR with no new lesions and decreased overall uptake AND residual BM abnormalities; OR CR by imaging with residual BM abnormalities; OR PR by imaging without residual BM abnormalities.