Stage I: The lesion was limited to the ovary or fallopian tube.
Stage Ia: lesions were limited to one ovary (with intact envelope) or fallopian tube, with no tumor on the surface of ovary or fallopian tube and no malignant cells in ascites or peritoneal washings.
Stage Ib: lesions were limited to both ovaries (with intact envelope) or fallopian tubes, with no tumor on the surface of ovaries or fallopian tubes, and no malignant cells in ascites or abdominal washings.
Stage Ic: lesions limited to one or both ovaries or fallopian tubes, accompanied by.
Stage Ⅰc1 Intraoperative peritoneal rupture;
Stage Ic2 preoperative rupture of the peritoneum or tumor on the surface of the ovary or fallopian tube;
Stage Ic3 Malignant cells were found in the ascites or in the peritoneal washings.
Stage II: lesions involving one or both ovaries or fallopian tubes with pelvic metastasis.
Stage IIa: lesions extend or metastasize to the uterus or fallopian tubes or ovaries;
Stage IIb: lesions extend to other pelvic tissues;
Stage IIb1 Pelvic peritoneal metastasis.
Stage IIb2: pelvic peritoneal metastasis visible to the naked eye.
Stage III: lesions involving one or both ovaries, fallopian tubes or primary peritoneal carcinoma, cytologically or histologically confirmed extra-pelvic peritoneal waves or retroperitoneal lymph node metastases.
Stage IIIa: retroperitoneal lymph node metastasis with or without extra-pelvic peritoneal invasion; .
Stage IIIa1 Metastasis to retroperitoneal lymph nodes only (cytologically or histologically confirmed)
Stage IIIa1i Metastatic lymph nodes ≤ 10 mm in maximum meridian
Stage IIIa1ii Metastatic lymph nodes >10mm
Stage IIIa2 Microscopic extra-pelvic (beyond the pelvic rim) peritoneal invasion with or without retroperitoneal lymph node metastasis.
Stage IIIb: extra-pelvic peritoneal metastases ≤2 cm in the largest meridian with or without retroperitoneal lymph node metastases were seen by the naked eye.
Stage IIIc: The maximum meridian of extra-pelvic peritoneal metastases was greater than 2 cm with or without retroperitoneal lymph node metastasis.
Stage IV: distant metastases (excluding peritoneal metastases)
IVa Pleural fluid formation with positive cytology.
IVb Metastasis to extra-abdominal organs.