Pfiz­er im­press­es car­dio crowd with mor­tal­i­ty and hos­pi­tal­iza­tion rates for tafamidis in AT­TR-CM -- but Al­ny­lam quick­ly blasts back

Pfiz­er has scored the kind of po­ten­tial­ly game-chang­ing piv­otal da­ta for tafamidis in rare cas­es of transthyretin amy­loid car­diomy­opa­thy that an­a­lysts have been on the look­out for. And the phar­ma gi­ant is rolling out an ex­pand­ed ac­cess pro­gram for AT­TR-CM pa­tients now — just as a ri­val ther­a­py from Al­ny­lam is hit­ting the mar­ket for the first time.

Re­searchers to­day fol­lowed up pos­i­tive top-line da­ta with the news that tafamidis spurred a 30% drop in mor­tal­i­ty risk along with a 32% re­duc­tion in the risk of car­dio-re­lat­ed hos­pi­tal­iza­tion.  That’s good enough to win over a key crowd of top an­a­lysts, but you can bet that there will be plen­ty of ques­tions to­day as every­one hunts for the dev­il in the de­tail. And Al­ny­lam wast­ed no time in rais­ing doubts about the da­ta, which is like­ly go­ing to re­lieve in­vestors fret­ting over the com­pe­ti­tion.

Cred­it Su­isse an­a­lysts ear­li­er not­ed that “even a mod­est im­prove­ment in mor­tal­i­ty (10% to 15%) would be fa­vor­able.” Any­thing 20% to 25% could prove to be a game-chang­er, they added, in a field where a land­mark RNAi ther­a­py from Al­ny­lam is about to hit the mar­ket and an­oth­er — less at­trac­tive — ther­a­py from Akcea and Io­n­is is like­ly right be­hind it.

The da­ta al­so hit a sec­ondary on an im­prove­ment in the re­duc­tion of per­for­mance in the 6-minute walk test along with an im­prove­ment in qual­i­ty of life scores.

But some ques­tions re­main. And at first blush Al­ny­lam got a quick thumbs up for re­main­ing com­pet­i­tive as a mar­ket show­down looms be­tween the lead­ers in the field.

Al­ny­lam fol­lowed up by point­ing out that Pfiz­er looks weak­est where it looks strongest, with­out a sta­tis­ti­cal­ly sig­nif­i­cant read­out for hered­i­tary AT­TR. The com­pa­ny al­so spot­light­ed the pooled dose re­sults, an un­usu­al de­ci­sion by Pfiz­er. They added:

  • In APOL­LO, over 50% of patisir­an pa­tients showed IM­PROVE­MENT rel­a­tive to base­line on both mNIS+7 and Nor­folk.
  • In APOL­LO car­diac sub­pop­u­la­tion of hAT­TR pa­tients*, patisir­an re­sult­ed in:
    • De­crease from base­line (i.e., IM­PROVE­MENT) in NT-proB­NP lev­els (55% re­duc­tion for pati rel­a­tive to pbo)
    • 31.6% of pati pa­tients had de­crease change from base­line of NT-proB­NP ≥30% and ≥300 pg/mL, a key mor­tal­i­ty prog­nos­ti­ca­tor, at Month 18, where­as no pbo pa­tients had de­creas­es of this mag­ni­tude.

Per­haps most sig­nif­i­cant­ly, Al­ny­lam al­so be­lieves that this field is pri­mar­i­ly a growth op­por­tu­ni­ty, as new and bet­ter di­ag­noses iden­ti­fy a grow­ing group of pa­tients for both. In that sce­nario, pa­tients and physi­cians can make their own choic­es as all the biotechs ben­e­fit.

You can get more de­tails in the study pub­lished in the New Eng­land Jour­nal of Med­i­cine.

In­vestors seem fair­ly hap­py ini­tial­ly with both sides. Al­nyam shares jumped 16% by the end of the day — a re­lief ral­ly — while Pfiz­er stock end­ed down a cou­ple of points.

Bren­da Coop­er­stone

Re­searchers of­fered pooled da­ta for two dos­es of the drug — an 80 mg and 20 mg reg­i­men — rather than break­ing the re­sults out in­to dosage groups, leav­ing it un­like­ly that they saw a clear dose re­sponse. An­a­lysts will be fol­low­ing up Pfiz­er’s state­ment to­day with more ques­tions on how the ther­a­py worked. But it’s clear that Pfiz­er will be claim­ing an ad­van­tage here, pro­vid­ing one rea­son for CEO Ian Read’s re­cent vote of con­fi­dence that the com­pa­ny’s late-stage pipeline can pro­vide the big drugs it needs to keep rev­enue on the up­swing.

The drug is al­ready armed with both a break­through ther­a­py des­ig­na­tion as well as a Saki­gake ti­tle from Japan­ese reg­u­la­tors. Look for some quick mar­ket­ing ap­pli­ca­tions and an ag­gres­sive roll­out if the da­ta hold up.

What we al­so didn’t get im­me­di­ate­ly was much de­tail on safe­ty da­ta. The drug arm and place­bo had a “com­pa­ra­ble” safe­ty pro­file, the com­pa­ny re­port­ed.

Cred­it Su­isse has es­ti­mat­ed peak sales at $600 mil­lion, with a shot at more un­der cer­tain cir­cum­stances. The big ques­tion now is how much Al­ny­lam — whose drug On­pat­tro was ap­proved for TTR polyneu­ropthay — might be af­fect­ed by the com­pe­ti­tion. Ac­cord­ing to the an­a­lysts:

Though the in­di­ca­tions may be dif­fer­ent, the prod­ucts will like­ly com­pete, as physi­cians we spoke with in­di­cat­ed that many pa­tients with car­diomy­opa­thy tend to al­so have polyneu­ropa­thy and vice ver­sa. A few physi­cians be­lieve Al­ny­lam’s prod­uct is the safer prod­uct and will use patisir­an to treat car­diomy­opa­thy while get­ting re­im­burse­ment for polyneu­ropa­thy. Oth­er physi­cians ex­pect to pri­mar­i­ly pre­scribe tafamidis if the out­come da­ta are clin­i­cal­ly mean­ing­ful.

Pfiz­er, though, al­so faces a chal­lenge in get­ting physi­cians to do a much bet­ter job at di­ag­nos­ing TTR-car­diomy­opa­thy. But their de­ci­sion to be­gin a wide-open ex­pand­ed ac­cess pro­gram is a clear shot over Al­ny­lam’s bow. The drug is al­ready ap­proved as Vyn­daqel and on the mar­ket to treat fa­mil­ial amy­loid polyneu­ropa­thy.

Their mar­ket ri­val­ry starts to­day.

Al­so af­fect­ed by to­day’s an­nounce­ment is Ei­dos Ther­a­peu­tics $EI­DX, which re­cent­ly went pub­lic as it pur­sued its own work in the field.

“We be­lieve the AT­TR-ACT study find­ings bring us a sig­nif­i­cant step clos­er to our goal of pro­vid­ing an ur­gent­ly need­ed ther­a­py for a se­ri­ous and of­ten fa­tal dis­ease,” said Bren­da Coop­er­stone, Pfiz­er’s chief de­vel­op­ment of­fi­cer for rare dis­ease. “We look for­ward to con­tin­u­ing dis­cus­sions with glob­al reg­u­la­to­ry au­thor­i­ties about the po­ten­tial of tafamidis as a treat­ment op­tion for peo­ple liv­ing with AT­TR-CM.” 

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