A trial last year against Novartis Pharmaceuticals Corp. featured shocking stories of sex discrimination against female sales representatives. One said her manager told her to get an abortion. Another claimed she was blamed for being raped during a work event.

But it was the cross-examination of Dr. Finis Welch, a key expert for Novartis, that tilted the trial toward the class in Velez v. Novartis Pharmaceuticals Corp., according to Katherine Kimpel and David Sanford, partners at Washington’s Sanford Wittels & Heisler, the lead plaintiffs’ lawyers.