CORRECTION: 5/25/2013 11:30 A.M. EDT. The subheadline of the original version of this article incorrectly stated that Proskauer Rose terminated Elly Rosenthal shortly after she returned from a medical leave in 2008. In fact, Rosenthal was terminated in 2011, roughly three years after the medical leave in question. The subheadline has been revised to reflect the correct information. We regret the error.

A former Proskauer Rose chief financial officer who sued the firm in 2011 alleging that various forms of discrimination led to her termination has whittled the claims contained in her initial suit to a single allegation: that the firm forced her out over a medical leave she took in 2008 after being diagnosed with breast cancer.