Both Merck & Co. and Halozyme are holding their ground in a freshly unveiled patent dispute surrounding the New Jersey pharma’s under-the-skin version of its blockbuster cancer drug Keytruda.

A new patent dispute is brewing between Halozyme Therapeutics (NASDAQ:HALO), a biotech focused on drug delivery technology, and Merck (NYSE:MRK) over an injectable version of the New Jersey-based pharma giant’s cancer blockbuster,

Merck's injected version of its blockbuster cancer drug Keytruda could face a potential patent challenge from biotech Halozyme Therapeutics , the Wall Street Journal reported on Wednesday, citing people familiar with the matter.

The new formulation of Keytruda, currently under FDA review, is sparking conflict with Halozyme, which makes enzymes that convert intravenous drugs into injectable versions.

Merck's newly developed injected version of its blockbuster cancer drug, Keytruda, may be at the center of a potential patent dispute, according to a report by The Wall Street Journal

Halozyme Therapeutics claims Merck's new Keytruda version infringes on patents, requiring a licensing agreement, reports WSJ.