Some random facts about $FATE (engineered NK cells) that might be interesting to my $AFMD (mabs w/ affinity to preload NK cells) and $GMDA (proprietary NK cell expansion combined w/ established antibodies) people.
Surprising to me - $FATE has only dosed 35 patients so far, across all their trials. 150+ doses, since re-dosing is what you do with NK cells. Safety w/ NK cells is excellent as usual.
NK cells + antibodies - where should each piece of functionality go? In particular, where should the targeting be? Build a receptor into the NK cell? Or pre-load NK cell w/ very sticky antibody? Both concepts can be off-the-shelf.
$FATE first clinical dataset - no responses in 15 solid tumors. Not surprising since it was monotherapy w/ an untargeted NK cell product. NK cells w/ out a targeting mechanism aren't promising.
FT596 embeds a CD19 CAR and is combined with CD20 mab in b cell lymphoma. Great concept. So far, 1 PD, 1 PR.

$GMDA plain-vanilla NK + rituxin has 10 CRs in 15 tries in similar population.

So $FATE has to leap a high bar, here.
$FATE has a CAR-NK for BCMA/MM construct, IND-ready. Recall that Genentech is already dose-escalating BCMA $AFMD antibody, which, I'd speculate, will be combined with NK cells once safety is established.
In 2021 $FATE will IND an NK cell designed to enhance antibody cytotoxicity in solid tumors.

Again, $AFMD is dose-escalating an EGFR targeted antibody right now, which is planned for NK cell combos.
Some takeaways:
1) Why is $FATE valued at $4.5b w/ out any proof of concept? Belief that engineered NK cells - CAR-NK or NK + antibodies - will work. And in particular that the engineering enabled by induced pluripotency will be big advantage vs. NK cells from other sources.
2) I don't think we know whether CAR-NK is better than engineered NK + extremely sticky pre-loaded antibodies ( $AFMD ), nor whether NK cells need to be improved in fancy ways. $GMDA 10/15 CRs in lymphoma suggests vanilla NKs + targeting is pretty good.
3) If you're agnostic about CAR-NK vs NK+sticky antibodies you ought to like $AFMD. AFMD/ $FATE have overlapping product concepts in lymphoma, BCMA, solids, etc. AFMD is 1/10th as expensive, and will have more clinical data sooner.
4) Big picture - pointing NK cells (via antibodies or CARs) at targets validated by monoclonal antibodies looks like a GREAT idea. Clinical data so far is promising, concept is straightforward, costs tolerable, safety is pristine. $AFMD fave play - but would like to find more.
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