Subject: Biosimilars

Solving the Culpable Co-Defendant Problem: An Update on Preserving Your Client’s Defenses after a Culpable Co-Defendant Files a Motion for Summary Judgment in California State Court

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California appellate courts have recently provided much needed clarity for defendants wishing to preserve the ability to attribute fault to a potentially culpable co-defendant seeking summary judgment. We previously addressed this issue in a 2021 blog post, highlighting the uncertainty facing defense counsel where granting summary judgment to a co-defendant would preclude an empty chair defense. Two published 2025 decisions now confirm that defendants can oppose a co-defendant’s summary judgment motion directly with no cross-complaint required.

This is a rare and tricky situation. Defendants in multiparty litigation often share interests. Opposing a co-defendant’s motion can inflate costs, strain relationships, and ultimately benefit plaintiffs. But sometimes preserving the ability to attribute fault to a co-defendant is necessary to protect your client.

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California Supreme Court Rejects Duty to Innovate

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On August 3, 2026, the California Supreme Court issued its decision in the closely watched Gilead Tenofovir Cases, No. S283862, — Cal.5th —, 2026 WL 2223748 (Cal. Aug. 3, 2026), rejecting the so-called “duty to innovate.” The court held, in a 6-1 decision, that “a drug manufacturer has no duty of care when deciding whether and when to develop and commercialize an allegedly safer alternative drug” to replace an admittedly nondefective drug. The decision is a significant victory for pharmaceutical manufacturers and carries substantial implications for product liability litigation across industries.

Background

The case arose from a Judicial Counsel Coordination Proceeding comprising more than 30,000 plaintiffs — HIV patients who took Gilead’s tenofovir disoproxil fumarate (TDF). Plaintiffs did not claim TDF was defective; it is undisputedly a life-saving medication. Instead, they alleged Gilead unreasonably delayed bringing an alternative medication, tenofovir alafenamide (TAF), to market, depriving them of a purportedly safer option and allegedly causing kidney, bone, or tooth injuries.

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FDA Approves First Interchangeable Biological Product Under BPCIA

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On July 28, the FDA approved the country’s first interchangeable biosimilar product. Semglee (insulin glargine-yfgn) is both biosimilar to, and interchangeable with, its reference product Lantus (insulin glargine).

Under the Biologics Price Competition and Innovation Act (BPCIA), biological products (e.g., vaccines and therapeutic antibodies) may come to market by showing that they are “biosimilar” to or “interchangeable” with a “reference product,” which is a biological product that has already been approved by the FDA. A biological product is “biosimilar” if it is “highly similar to the reference product notwithstanding minor differences in clinically inactive components” and “there are no clinically meaningful differences between the biological product and the reference product in terms of the safety, purity, and potency of the product.” 42 U.S.C. § 262(i)(2). To date, 28 biological products have been approved as biosimilars.

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