my mom is suffering from ovarian cancer
2 years she got operated & got 6 cycles of chemotherapy

aftr a year of operation..she had 2 small cysts in the ovary & they wer neutral

afr 3 or 4 months one of the cysts got disappeared but one exseted & latr now developed in to cancerous cyst
its size was of 40\40 mm
& got increased to 75\75 mm

after 2nd phase of chemotherapy...that cyst got reduced back to 40/40mm now
doctors said that the cyst should be reduced completely...but it didnt even aftr complete 6 cycles of chemotherapy for 2nd phase...

can we conduct a operation now as even cancerous r no more ...& remove that cyst??
because that cyst might later develop back to cancerous as it happened last time
doctors said that the neutral crst is ok in the human body ,,,but i read in the internet that even a normal cyst shouldnt be kept inthe body not more than 8 weeks...
so.. i feel doctors neglected at that point 7 yet kept the cyst in the body which now had turned back to cancerous...

what can be the perfect solution now to treat??
plz..i need asnwer for this ..
thanks