Ash 2020 preview – Novartis touts its Tasigna follow-on

Pivotal data at the upcoming Ash conference make Novartis’s asciminib one of the highlights for oncology watchers.

After years in relative obscurity Novartis’s BCR-ABL tyrosine kinase inhibitor asciminib could give the Swiss group’s chronic myelogenous leukaemia franchise a third pillar, late-breaking pivotal data to be presented at the Ash conference suggest.

The presentation, from the Ascembl study pitting asciminib against Pfizer’s Bosulif in third-line or later CML, will be of major interest for investors focusing on blood cancers. Other Ash oncology data include a large array of bispecific antibodies, among which two anti-CD20 assets come from Roche.

For Novartis asciminib is a valuable asset. Its Gleevec blockbuster was the first drug targeting the BCR-ABL oncoprotein to be launched for CML, and it revolutionised treatment of this disease.

Me-too assets followed from Bristol Myers Squibb (Sprycel), Pfizer (Bosulif) and Takeda (Iclusig), and Novartis’s own Tasigna is an important first-line drug too. However, Gleevec is now off patent, and Tasigna only has three years’ exclusivity left.

Selected BCR-ABL tyrosine kinase inhibitors for CML
        Sales ($m)
Drug Company Label US patent expiry 2019 2026e
Gleevec Novartis 1st line 2016 1,263 467
Sprycel Bristol Myers Squibb 1st line 2020 2,110 241
Tasigna Novartis 1st line 2023 1,880 321
Bosulif Pfizer 1st line (usually used later) 2024 365 373
Iclusig Takeda 2nd line 2026 396 584
Asciminib Novartis Not approved Unclear 0 119
Source: EvaluatePharma.

Now Novartis reckons to have a mechanistic ace up its sleeve. Unlike the approved BCR-ABL assets asciminib specifically hits the oncoprotein’s ABL myristoyl pocket, a first-in-class approach that the group claims could combat the build-up of resistance pathways.

The 233-patient Ascembl trial was said in August to have read out positively, and the Ash late-breaker reveals a 24-week molecular response rate, its primary endpoint, of 25.5% for asciminib versus 13.2% for Bosulif, with the difference yielding a p value of 0.029. Severe adverse events occurred less frequently with asciminib than with Bosulif.

As the study enrolled subjects who had failed two or more therapies, data discussion at Ash might focus on baseline imbalances: 52% and 28% of asciminib subjects were third and fourth line respectively, versus 40% and 38% for Bosulif; asciminib’s advantage over the Pfizer drug was most pronounced in third-line subjects.

The detail might be important in determining how big a slice of the CML market asciminib might seize. Though Bosulif has a first-line label it is usually used second line or later, and Iclusig, a third-generation drug, is an important second-line (and later) option.

Selected Ash 2020 presentations in oncology (excluding cell therapies)
Project Company Detail Abstract
Chronic myelogenous leukaemia
Asciminib (ABL001) Novartis Ph3 study, 2L to >6L, major molecular response 25.5% vs 13.2% for Bosulif LBA-4
Acute myelogenous leukaemia
GTB-3550 GT Biopharma Anti-CD16 x CD33 (+ IL-15 linker) trispecific NK cell engager, no responses in 3 pts 65
Sabatolimab (MBG453) Novartis Anti-Tim3 MAb, 25 Jun 2020 data cut: 41% ORR in 34 1L pts 657
Odronextamab (REGN1979) Regeneron Anti-CD20 bispecific, 25 Jun data cut: 53% ORR in 151 pts, incl Car-T refractory 400
Mosunetuzumab Roche Anti-CD20 bispecific, 27 May 2020 data cut: 63% ORR (1 relapse) in 19 pts 401
Glofitamab Roche Anti-CD20 bispecific, 17 Apr 2020 data cut: 63% ORR in 32 pts 403
Trph-222 BMS/ Triphase Accelerator Anti-CD22 ADC, lymphoma, 30 Jun 2020 data cut: 23% ORR in 22 pts, incl Car-T refractory 701
MEDI-570 Astrazeneca Anti-Icos MAb in lymphoma, Jun 2020 data cut: 22% ORR in 18 pts 1151
Multiple myeloma
MEDI2228 Astrazeneca Anti-BCMA ADC, 15 May 2020 data cut: 45% ORR in 82 pts 179
REGN5458 Regeneron Anti-BCMA bispecific, 15 Jun 2020 data cut: 36% ORR in 45 pts 291
TNB-383B Teneobio/ Abbvie Anti-BCMA bispecific, 13 Jul 2020 data cut: 37% ORR in 38 pts 293
Talquetamab J&J Anti-GPRC5D bispecific, 20 Jul data cut: 78% ORR in 18 pts given IV, 67% ORR in 12 pts given SC dose 290
RG6060 Roche Anti-FcRH5 bispecific, 13 Apr 2020 data cut: 52% ORR in 29 pts 292

If franchise protection is Novartis’s aim with asciminib then similar thinking might lie behind Roche’s development of projects that, like the ageing lymphoma/chronic lymphoblastic leukaemia blockbuster Rituxan, target CD20.

To this end the group is presenting mid-stage clinical data on two anti-CD20 bispecifics, mosunetuzumab and glofitamab, which are both now in phase III. A similarly acting asset, Regeneron’s odronextamab, is earlier in development, and features in the same Ash session.

The response rates seen so far come from early cuts of the data disclosed in the abstracts, but of more importance will be the updates given at Ash itself, which will presumably comprise results at much later cuts.

Immuno-oncology watchers will note the continued presence of assets targeting once hotly touted antigens like Tim3 and Icos, and there is the usual multitude of BCMA-targeting modalities for multiple myeloma, including for instance Abbvie’s TNB-383B.

That last asset might be significant for another reason: Abbvie picked it up from Teneobio last year. With an overall remission rate cited in the abstract of just 52% at the high dose the Ash data could raise further questions about Abbvie’s deal-making prowess.

Ash 2020 will take place in virtual format on December 5-8.

Vantage analysis previously summarised upcoming Ash presentations that resulted in early share price moves, and separately those in non-oncology indications.

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