Amyloidosis Pipeline Still Looks To Alnylam For Answers

The failure of Bellus Health’s (OTCPK:BLUSF) phase III amyloidosis trial reaffirms Alnylam’s (NASDAQ:ALNY) position in the race to develop a treatment for this rare disease. Sitting alongside it are phase III candidates from Prothena (NASDAQ:PRTA) and Takeda (OTCPK:TKPYY), and all should start generating data within the next two years.

Further down the pipeline timings are less clear, but both large and small companies are looking into the space, with GlaxoSmithKline (NYSE:GSK) boasting three assets in early development (see table). With the only marketed product Pfizer’s (NYSE:PFE) Vyndaqel still not available in the US, there is everything to play for.

Setbacks

Bellus’ Kiacta failed to slow renal function decline in patients with AA amyloidosis, the primary endpoint of its phase III trial. AA amyloidosis is often caused by chronic infection or inflammatory disease that leads to amyloid accumulation in the kidneys, liver and spleen.

The company, which has just C$9m ($7m) in cash and no marketed products, saw its stock plummet by 86% this week on the news. Kiacta has had a tortuous development path, and it looks like little can now be done to salvage it (Therapeutic focus – Amyloidosis options emerging from Pfizer, Alnylam, May 31, 2012).

Another recent disappointment was Ionis Pharmaceutical’s (NASDAQ:IONS) IONIS-TTRRx, which was hit with safety issues in a trial in familial amyloid polyneuropathy (FAP), a form of amyloidosis that affects nerve tissue. Cases of severe thrombocytopenia were reported (Ionis safety blow boosts Alnylam, May 27, 2016).

Subsequently a study in familial amyloid cardiomyopathy (FAC; accumulation in the heart) was put on hold until more data from the neuro trial become available. Results are expected in the first half of next year, and are key for partner Glaxo to make a decision on an ongoing relationship.

Remaining ahead

The setbacks have boosted Alnylam, whose two phase III assets, patisiran and revusiran, are being tested in FAP and FAC respectively.

Patisiran’s pivotal study, Apollo, is due to read out by the middle of next year, with a primary endpoint of change in neuropathy impairment score. Positive results were previously seen in a small open-label phase II trial (Study read-across and biotech bull market help Alnylam climb, October 14, 2014).

Meanwhile, revusiran’s Endeavour study is enrolling, and results are due in mid-2018. Primary endpoints include the six-minute walk test and differences in serum transthyretin levels.

Patisiran and revusiran are RNAi therapeutics that knock down wild-type and mutated forms of transthyretin, a protein that when misfolded leads to amyloid accumulation in amyloidosis. Ionis’s IONIS-TTRRx is an antisense project designed to reduce the production of transthyretin.

Alnylam and its partner Sanofi (NYSE:SNY) have not seen thrombocytopenia in trials, suggesting that this could be an antisense-related effect. If the safety issues suffered by Ionis can be avoided patisiran and revusiran could sell $690m and $795m in 2022, according to EvaluatePharma sellside consensus.

Alnylam also has ALN-TTRsc02, which recently entered phase I as a once-quarterly treatment.

Selected amyloidosis pipeline

Status

Project

Company

Pharmacology class

Type of amyloidosis

Trial ID

Phase III

Patisiran

Sanofi/Alnylam

Transthyretin RNAi therapeutic

FAP

NCT01960348

(Apollo)

Revusiran

Sanofi/Alnylam

Transthyretin RNAi therapeutic

FAC

NCT02319005

(Endeavour)

NEOD001

Prothena

Anti-beta-amyloid MAb

AL amyloidosis

NCT02312206

(Vital)

Ninlaro

Takeda

Proteasome inhibitor

AL amyloidosis

NCT01659658

(Tourmaline-AL1)

Phase II

Zydelig

Gilead Sciences

PI3k-delta inhibitor

AL amyloidosis

NCT02590588

Treanda

Teva/Astellas

Alkylating agent

AL amyloidosis

NCT01222260

Revlimid

Celgene

Immunomodulator

AL amyloidosis

NCT00564889

Pomalyst

Celgene

Immunomodulator

AL amyloidosis

NCT01570387

SOM0226

SOM Biotech

Metabolic disease agent

FAP

NCT02191826

Phase I

MAb-11-1F4

NCI

Chimaeric amyloid-reactive MAb 111F4

AL amyloidosis

NCT02245867

Kyprolis

Amgen/Ligand

Proteasome inhibitor

AL amyloidosis

NCT01789242

GSK2315698

GlaxoSmithKline

Serum amyloid P component depleter

Systemic amyloidosis

NCT01777243

GSK2398852

GlaxoSmithKline

Anti-serum amyloid P component MAb

Systemic amyloidosis

NCT01777243

GSK3039294

GlaxoSmithKline

Serum amyloid P component depleter

Systemic amyloidosis

NCT02603172

ALN -TTRsc02

Alnylam

Transthyretin RNAi therapeutic

Transthyretin amyloidosis

NCT02797847

FAP:Familial amyloid polyneuropathy, FAC: Familial amyloid cardiomyopathy

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Also in phase III is Prothena’s NEOD001, a monoclonal antibody targeting misfolded proteins being tested in AL amyloidosis, which occurs when plasma cells produce antibodies with misfolded light chains, which are deposited as amyloid in organs.

Enrollment into Prothena’s phase III Vital trial is expected to complete in the second quarter of next year, while topline results from its phase IIb Proto study are expected late in the year.

As of March the company had $474m in cash, including $129m net from an equity offering in January. Credit Suisse says peak sales could reach $1.85bn by 2030.

Takeda’s Ninlaro is also being tested in AL amyloidosis, and received breakthrough therapy designation at the end of 2014. The phase III Tourmaline-AL1 study tests Ninlaro in combination with dexamethasone, and is estimated to complete in August 2018.

Ninlaro is marketed for multiple myeloma – a cancer of plasma cells; about 10-15% of patients with this disease also develop AL amyloidosis.

Even earlier

Celgene (NASDAQ:CELG) is also trying out the multiple myeloma treatment approach, testing Revlimid and Pomalyst in phase I/II trials. Meanwhile, Gilead is recruiting a small phase II trial testing Zydelig, its chronic lymphocytic leukaemia treatment. The primary completion date is October 2018. Teva's Treanda, also on the market for CLL, is in a phase II amyloidosis trial that could read out by the year end.

Glaxo's assets are in phase I; two are serum amyloid P (SAP) component depleters and one is a monoclonal antibody. SAP binding stabilises amyloid fibrils, aiming to deplete circulating SAP, enabling injected anti-SAP antibodies to reach residual SAP in amyloid deposits. An open-label phase I trial in 15 patients triggered clearance of deposits from the liver.

The only marketed product, Pfizer’s Vyndaqel, has been on sale in Europe for FAP since 2011. However, it received a US complete response letter back in 2012, with the FDA requesting a secondary efficacy study (Alnylam pushes forward in amyloidosis after Pfizer set back, July 16, 2012). According to clinicaltrials.gov a 330 patient study in transthyretin cardiomyopathy is to start recruiting this month.

Few analysts have forecasts for Vyndaqel, but those at Credit Suisse expect sales of $304m by 2022. With little news on its status in the US, and with Alnylam potentially gaining approval within two years, the race to market will be watched with interest.

Disease Condition

Precursor Protein

Organs Affected

ATTR amyloidosis

(also called TTR amyloidosis) Includes FAP and FAC

Transthyretin (TTR) – genetic ‘variant’ type

Nerves

Heart

Carpal tunnel in the wrist

Gastrointestinal tract

Sometimes:

Eye, Kidneys,

Thyroid, Adrenals, Blood vessels

AL amyloidosis

(the most common type of amyloidosis)

Monoclonal Immunoglobulin (antibody) Light chains

Kidney

Heart

Nerves

Gastrointestinal tract

Skin

Tongue (macroglossia- enlarged tongue)

Joints

AA amyloidosis

Serum amyloid A protein

Kidney

Gastrointestinal tract

Liver

Source:http://ttrstudy.com/attr-amyloidosis/

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