Pharma BD Deal Intelligence
The reverse merger gave Mereo BioPharma a Nasdaq listing plus two oncology candidates, but both fizzled—Celgene passed on etigilimab in 2019 and navicixizumab was out-licensed to Oncologie for just $4M upfront. The $57M transaction's real value was the shell listing itself; neither oncology asset ever reached approval.
The Nasdaq listing was the real prize; both OncoMed oncology assets (etigilimab, navicixizumab) fizzled and were out-licensed for token sums, while Mereo's value now rests entirely on unrelated rare-disease assets.
Full analysis, sources & comparables →Endpoints framed the deal as Mereo executing a 'back flip onto Nasdaq' by combining with a 'flailing OncoMed,' highlighting the transaction as a low-cost route…
Post-close coverage emphasized Mereo retained 'a select number of OncoMed employees' and the Redwood City base, with skepticism about whether the navicixizumab…
Mereo announced FDA Fast Track designation for navicixizumab in heavily pretreated ovarian cancer following phase 1b data showing 43% ORR with paclitaxel — the…
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UK-listed Mereo BioPharma announced December 2018 stock-for-stock reverse merger with US-listed OncoMed Pharmaceuticals to gain Nasdaq listing and add two oncology candidates (navicixizumab anti-DLL4/VEGF bispecific and etigilimab anti-TIGIT). OncoMed shareholders received Mereo ADSs plus contingent value rights, with former OncoMed holders owning ~25% of combined company. Strategically notable as a precedent-setting transatlantic biotech reverse merger structure. Closed April 23, 2019.
The Nasdaq listing was the real prize; both OncoMed oncology assets (etigilimab, navicixizumab) fizzled and were out-licensed for token sums, while Mereo's value now rests entirely on unrelated rare-disease assets.
Assessment window: 5yr post-close.
20K US cases/yr · $1.7B US ovarian cancer drugs market 2024 (44% of $3.84B global)
Ovarian cancer is the deadliest gynecologic malignancy, with most patients diagnosed at advanced stage and ~70% relapsing within three years of first-line platinum chemotherapy. Platinum-resistant disease (recurrence within 6 months of platinum) carries a particularly poor prognosis and limited treatment options, with response rates to standard salvage regimens typically below 20%.
The platinum-resistant ovarian cancer (PROC) treatment landscape in late 2018 was dominated by anti-angiogenic and PARP-inhibitor classes. Roche/Genentech's Avastin (bevacizumab) plus weekly paclitaxel was the established anti-angiogenic standard following the AURELIA trial, with ORRs near 27%. PARP inhibitors — AstraZeneca's Lynparza (olaparib), GSK/Tesaro's Zejula (niraparib), and Clovis's Rubraca (rucaparib) — captured the BRCA-mutant and HRD-positive maintenance setting but offered limited benefit in heavily pre-treated, bevacizumab-exposed PROC. Single-agent chemotherapies (pegylated liposomal doxorubicin, topotecan, gemcitabine) remained the backbone for late-line patients with poor response rates. Navicixizumab — a bispecific anti-DLL4/VEGF antibody — was differentiated by simultaneously blocking Notch (DLL4) and VEGF angiogenic pathways, with phase 1b data in 44 PROC patients (many bevacizumab pre-treated) showing 43.2% ORR plus paclitaxel, earning FDA Fast Track designation in October 2019. The OncoMed reverse merger gave Mereo Nasdaq access plus this Fast Track-eligible asset; Mereo subsequently out-licensed navicixizumab to Oncologie (now OncXerna) in 2020, signaling Mereo's strategic pivot toward rare disease (setrusumab, alvelestat).
| Deal | Year | Value | Outcome |
|---|---|---|---|
| Mereo BioPharma Group plc / OncoMed Pharmaceuticals, Inc. (this deal) | 2018 | $57M | 27 |
| AstraZeneca PLC / Daiichi Sankyo Company, Limited | 2019 | $6.9B | 100 |
| Novartis AG / Endocyte, Inc. | 2018 | $2.1B | 96 |
| Astellas Pharma Inc. / Seagen Inc. | 2009 | $4.5B | 95 |
| Bristol-Myers Squibb Company / Medarex Inc. | 2009 | $2.4B | 92 |
| Servier / Agios Pharmaceuticals (oncology) | 2020 | $2.0B | 91 |
| Servier Pharmaceuticals LLC / Agios Pharmaceuticals Inc. | 2020 | $2.0B | 91 |
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