Did Nixon Peabody and Mintz, Levin, Cohn, Ferris, Glovsky and Popeo usher in the demise of a biotech startup that was poised to thwart cancer and potentially earn billions in the process?

That’s the premise of a 45-page complaint filed Tuesday in U.S. district court on Long Island by Neogenix Oncology Inc., a bankrupt developer of cancer diagnostic and treatment products. The suit claims that the two law firms stood idly by for years while Neogenix’s chief financial officer blatantly violated securities laws, leading to an investigation by the U.S. Securities and Exchange Commission and financial ruin.