Catumaxumab

My mom has 1 chemo session left for stage IIc clear cell ovca. Her gynocologist oncologist said he would of classified it as a stage Ic, but for the medical community it needs to be IIC. Her right ovary had small rupture, and it touched the pelvic wall...
Last week her doctor suggested she go for a second opinion after a clear CT scan and ask about taxol maintence for 12 months or any antibodies, or possibly the drug Catumaxumab? It is for stage II patients and it is in trial? Does anyone know of this and is it a benefit after her 6 cycles of first line chemo?

thanks in advance.