Bristol Myers Ends Blood Cancer Drug Deal With Cell Therapy Maker Cellares
Bristol Myers Squibb (BMY) ended its partnership with Cellares to manufacture its blood cancer therapy, Breyanzi, citing commercial-scale production issues. Breyanzi generated $1.36B in 2025 sales. Cellares may lay off workers due to the loss. The 2024 deal was worth up to $380M.
How this was made
The 30-second read
Why it matters
The deal termination signals operational challenges for BMS's Breyanzi product, which generated $1.36B in 2025 sales.
Market read
First report of partnership termination; material for BMY valuation and supply‑chain risk assessment.
What to watch
Cellares' capacity issues could affect other pharma partners, potentially creating opportunities for competitors.
Background
BMS had a 2024 agreement with Cellares worth up to $380M for CAR‑T manufacturing across multiple regions.
Ticker impact
Bristol Myers Squibb ended its partnership with Cellares, terminating a $380M manufacturing deal for Breyanzi CAR‑T therapy.
Potential short‑term downside as investors reassess CAR‑T pipeline execution.
The termination removes a key manufacturing partner, creating supply‑chain risk for a $1.36B revenue product.
Market effects
CAR‑T and broader oncology biotech sector may see heightened scrutiny on manufacturing partnerships.
U.S. biotech equities could face modest pressure as supply‑chain concerns emerge.
Limited to companies with similar cell‑therapy manufacturing dependencies.
Counterpoint
The termination may allow BMS to partner with a more scalable manufacturer, improving long‑term margins.
Key entities
- companyBristol Myers Squibb
Large U.S. pharmaceutical company, ticker BMY.
- companyCellares
Cell‑therapy startup, private.


