Material and Method: Twenty patients diagnosed as primary tubal cancer at the Pathology Department of the Istanbul Faculty of Medicine between October 1997 and December 2005 are described in our study.

Results: The patient age ranged from 43 to 74 years. Of the patients, 13 underwent surgical staging. Most of the patients were classified as stage III. The most common histological type was serous carcinoma. Only one patient had another synchronous primary gynecologic cancer. Of the 11 patients with complete prognostic data, 9 were alive for 16 to 106 months after initial surgery. In conclusion, primary cancers of the fallopian tube are similar to ovarian cancers with their pathological features and usually advanced stage - cancers with peritoneal and lymphatic spread. They can be successfully treated with the combination of cytoreductive surgery and chemotherapy.

Conclusion: We suggest that a thorough macroscopic examination of gynecological specimens by the pathologists would increase the percentage of these “rare” tumors.

,1. Evidence of origin in the tubal mucosa, ideally in the form of intramucosal carcinoma with or without invasive disease.

2. Parenchymal involvement of the ovaries is of less magnitude than the tubes and if present is largely confined to the surface.

The surgical treatment in 6 cases (30%) was standard hysterectomy with salpingo-oophorectomy. In addition, 13 patients (60%) underwent omentectomy with or without pelvic/ paraaortic nodal sampling and peritoneal washing samples were obtained. The surgical treatment was only salpingectomy for the case diagnosed as malignant mesothelioma. Of the 13 patients who underwent surgical staging, twelve had abdominal involvement classified as Stage III. Of 6 patients who underwent total abdominal hysterectomy and bilateral salpingo-oophorectomy without further surgical evaluation, three presented with ovarian and paratubal infiltration (at least Stage II). Two patients were found to have lymph node metastases. Seven patients received full dose chemotherapy based on taxol and carboplatin while 2 received cisplatin and endoxan.

Histologically, ten cases were of serous type (Figure 1), three were of mixed type, and one was of pure transitional type (Figure 2). Four cases were poorly differentiated carcinomas and two of them had preoperative chemotherapy treatment. These four cases were therefore classified as the unclassified histological type. One of the cases, which was classified as mixed-type histology, had serous, mucinous and endometrioid areas (Figure 3). The other case involved the transitional and serous-types together. Apart from these 18 cases, there was a 22-year-old patient with malignant mesothelioma limited to the tubal wall, and finally a 63- year-old patient who was classified as carcinosarcoma (Figure 4). We synchronously found another gynecological primary cancer in one case with endometrial location, which contained a gross tumor in the fallopian tube (Figure 5). An intramucosal tubal carcinoma was present in this case with an endometrial carcinoma arising from the surface epithelium at the same time.

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Figure 1: Serous adenocarcinoma developing from the tubal wall. (H&E, x40)

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Figure 2: The general aspect of the tubal transitional cell carcinoma. (H&E, x100)

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Figure 3: Endometrioid and mucinous carcinoma of the tuba. (H&E, x100)

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Figure 4: Carcinosarcoma of the tuba with malignant epithelial and sarcomatous components. (A: H&E, x200; B: x400)

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Figure 5: The macroscopic appearance of the primary tubal carcinoma

Grading was performed in all cases except two cases that were an intraepithelial carcinoma and malignant mesothelioma. Six of the cases were Grade I, 9 were Grade II and 3 were Grade III. We could reach prognostic information for eleven patients. One of these patients died of hypertension within one year after the surgery and four had recurrences. The recurrences were at the uterine corpus, in abdomen and near gallbladder and were found to occur 6, 7, 15 and 24 months after the first observation. All of these 4 patients underwent surgery again and one of them was found to be alive 16 months after the second surgery. One patient had a second recurrence within 36 months and underwent surgery again but died of the tumor. 9 patients were still alive for 35, 41, 43, 103, 215, 106, 63, 81 and 16 months after surgery.

Tubal cancers were observed at early stages in some studies because of their early and evident typical symptoms^7,10,13. In other studies, the patients had advanced stage (Stage III-IV) disease^8,12. Most of the patients (60%) in our series were Stage III. Some cases had diffuse pelvic metastases and were preoperatively regarded as ovarian or primary peritoneal carcinoma. From this point of view, we may suggest that a thorough macroscopic examination and more sampling from the tubal zone, even if it appears normal, would increase the percentage of gynecological cancer cases diagnosed as primary tubal carcinoma. It has also been reported that tumor location in the fallopian tube and the status of the fimbrial end are important with regard to prognosis in early stage tubal carcinomas, necessitating the use of more detailed staging systems¹⁴. Studies of patients with the BRCA mutation have been of particular value and examination of prophylactic salpingo-oophorectomies will reveal an early cancer in approximately 5% of individuals, with 80% of these early carcinomas originating in the distal fallopian tube^15-18.

The most frequent histological type of primary tubal carcinoma is the serous type, and the second most frequent is the endometrioid type. Clear cell and pure mucinous-type carcinomas are less common^{1-5,7,8,12,19} and transitional cell carcinomas are more frequently encountered in the fallopian tube when compared to their ovarian counterparts^20,21. Carcinosarcomas are rarely seen in the fallopian tube^7,22,23. In accordance with the literature, we observed that serous tubal carcinomas were the most frequent histological type in our series. There was a case of mesothelioma and another case of carcinosarcoma in our study in contrast to the literature.

The differentiation of primary tubal cancers from primary peritoneal cancers is a subject of debate. Recent studies have suggested that the distal fallopian tube is the origin for ovarian or peritoneal serous carcinomas. These observations lead to the development of a proposed fallopian tube pathway to serous malignancies. Nevertheless, the classification of tubal or pelvic origin in a serous carcinoma displaying features of both extensive peritoneal involvement and tubal intraepithelial carcinoma is still controversial^24-26. The real incidence of primary carcinoma of the fallopian tube in the general population is therefore still not known. More studies are required to solve this problem. In our 5 cases with extensive peritoneal involvement, we had a similar problem in determining the primary origin of the cancer. Tubal intraepithelial carcinoma was detected in all 5 cases with a detailed macroscopic and microscopic examination and they were regarded as primary tubal carcinomas

The management of the tubal carcinoma is cytoreductive surgery and chemotherapy. The overall survival is reported to range from 30 to 50 months. Stage, lymph node status, positive peritoneal cytology, grade and clinical response to chemotherapy are known as the prognostic factors for tubal carcinomas^8,13,14. Tubal wall invasion and location at the fimbrial end are said to be the prognostic factors for early stage carcinomas. The survival and recurrence characteristics of 11 patients were like the literature in our study. Although one of our patients was classified as Stage III, she was surprisingly doing well 106 months after the initial therapy. Histopathologically, this case was a Grade I-serous carcinoma and the low histopathology grade could be the reason for the unexpectedly good prognosis for this patient.

Finally, primary tubal carcinomas diagnosed in our department were evaluated generally as serous carcinomas and high-grade tumors at an advanced stage. Preoperative and postoperative incorrect diagnoses can often be made because of the localization of these tumors. Pathologists should therefore be careful during macroscopic examination of the female genital tract specimens especially in postmenopausal women with unexplained uterine bleeding or an adnexial mass. In the same way, more samples should be taken from the tubal zone especially from the fimbrial part when no gross tumor appears in the ovaries as commonly happens after preoperative chemotherapy. We suggest that a thorough macroscopic approach would lead to an increase on the incidence of primary tubal carcinoma among gynecopathology cases.

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