On June 15, 2018 MorphoSys AG (FSE: MOR; Prime Standard Segment, TecDAX; Nasdaq: MOR) reported its updated data from the ongoing phase 1/2a study of the anti-CD38 antibody MOR202 in relapsed/refractory multiple myeloma at the European Hematology Association (EHA) (Free EHA Whitepaper) Annual Meeting 2018 in Stockholm (Press release, MorphoSys, JUN 15, 2018, View Source [SID1234527339]). The dose escalation trial comprises three arms: MOR202, MOR202 in combination with the immunomodulatory drug (IMiD) lenalidomide (LEN), and MOR202 in combination with the IMiD pomalidomide (POM), in each case with low-dose dexamethasone (DEX).

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"We are optimistic about the responses seen in patients with multiple myeloma treated with MOR202 plus LEN/DEX and POM/DEX based on matured data as well as about the low proportion of patients experiencing infusion-related reactions," commented Dr. Malte Peters, Chief Development Officer of MorphoSys AG. "There is a medical need for new treatment options in multiple myeloma and we look forward to further maturing data from this ongoing trial."

In total, 56 patients were evaluable for safety and efficacy analysis in the clinically relevant dose cohorts of MOR202 (4 mg/kg, 8 mg/kg, 16 mg/kg) by the time of the data cut-off at December 31, 2017. At data cut-off, 16 patients remained in the study. Of the 56 evaluable patients, 18 had received MOR202 plus DEX, 21 received the combination of MOR202 and POM/DEX and 17 received MOR202 plus LEN/DEX.

MOR202 was given as a two-hour infusion up to the highest dose of 16 mg/kg. Infusion-related reactions (IRRs) occurred in 11% of patients in the clinically relevant dose cohorts of MOR202 and were limited to grade 1 or 2. Further, infusion time could be shortened to 30 minutes in the majority of the 16 patients remaining on study as per the data cut-off date.

The most frequent adverse events of grade 3 or higher were neutropenia, lymphopenia, and leukopenia in 52%, 48%, and 39% of patients, respectively. No unexpected safety signals were observed.

Patients treated with MOR202 in combination with LEN/DEX had a median of two prior treatment lines, 59% being refractory to at least one prior therapy. Median progression-free survival (PFS) was not yet reached. With six of the 17 patients in this cohort still on study at data cut-off, the median follow-up was 16.6 months. An objective response was observed in eleven out of 17 patients (65%), with two complete responses (CR), three very good partial responses (VGPR) and seven partial responses (PR).

Patients receiving MOR202 with POM/DEX, had a median of three prior treatment lines, all being refractory to the last prior therapy. Median PFS was 17.5 months. With ten out of 21 patients in this cohort still on study at data cut-off, the median follow-up was 6.5 months. An objective response was observed in ten out of 21 patients (48%), with two patients achieving a complete response (CR), four patients with a very good partial response (VGPR) and four partial responses (PR).

Patients treated with MOR202 plus DEX had a median of three prior treatment regimens, with 67% being refractory to any prior therapy. Median PFS in this cohort was 8.4 months. All patients had discontinued the study before data cut-off, i.e., follow-up for this cohort is completed. An objective response was observed in five out of 18 patients (28%).

Details of the MOR202 presentation at EHA (Free EHA Whitepaper) 2018

Abstract Code: S848

MOR202 with low-dose dexamethasone (DEX) or pomalidomide/DEX or lenalidomide/DEX in relapsed or refractory multiple myeloma (r/r MM): A phase I/IIa, multicenter, dose-escalation study

The oral presentation will be given during the session "New therapeutic strategies to improve the outcome of relapse/refractory plasma cell disorders" on Saturday, June 16, 2018, from 4:15-4:30pm CEST (10:15-10:30am EDT), in Room A1 at the Stockholmsmässan in Stockholm.

Additional information can be found at www.ehaweb.org, including the abstracts.