ANNUAL MEETING ABSTRACTS 273A Design: From January 2011 to August 2013, 162 patients underwent robotic laparoscopic radical prostatectomy for clinically localized prostatic carcinoma at our institution. Gynecologic and Obstetric Pathology Periprostatic fat pads, yielded during defatting of the prostate, were dissected and sent to pathology for histopathologic examination in 133 cases. Clinical and pathological 1128 Recurrent Grade I, Stage Ia Endometrioid Carcinomas of the Uterus: staging was recorded according to the 2009 American Joint Committee on Cancer Analysis of Pathology and Correlation with Clinical Data (AJCC) criterion. SN Agoff. Virginia Mason Medical Center, Seattle, WA. Results: Of 133 patients whose periprostatic fat was examined, 32 (24%) patients had Background: Low-grade and low-stage endometrioid carcinoma of the uterus is thought lymph nodes in the periprostatic fat pads. Metastatic prostatic carcinoma to periprostatic to have an excellent prognosis in the vast majority of patients. However, despite the lack lymph nodes was detected in 5 individuals (3.8%). All 32 patients had bilateral pelvic of myometrial invasion or superfi cial invasion, some patients develop recurrent disease, lymphadenectomy. 3 of the 5 patients with positive periprostatic lymph nodes had no often in the vaginal apex. There is limited literature on these tumors, but recent analyses metastasis in pelvic lymph nodes, thereby upstaging 3 cases from T3N0 to T3N1. No have implicated the pattern of myoinvasion as a prognostic factor. The emphasis of relationship exists between the presences of periprostatic LNs and prostate weight, the current study is non-invasive or stage Ia, grade I endometrioid adenocarcinomas. patient age, pathological staging or Gleason score. When compared to cases with Design: The pathology data base at Virginia Mason Medical Center (VMMC) was tumor free periprostatic LNs, the tumor in cases with metastatic periprostatic LNs searched for cases of grade I endometrioid carcinoma from 1998 to 2012, along with has following features: 1) higher postoperative Gleason score (P=0.01); 2) higher prior biopsy diagnosis. Cases with concurrent ovarian and carcinoma were excluded pathological staging (p=0.001); 3) higher rate of seminal vesicle invasion (p=0.01); as were cases with 50% or > myometrial invasion. Pathological and clinical data was 4) higher rate of extracapsular invasion (p=0.00001); higher rate of positive surgical collected. Histological evaluation was performed, when possible, on either the original resection margin (P=0.001). biopsy, hysterectomy and/or follow-up biopsies. Pt with tumor free LNs in Pt with metastatic LNs in Results: At VMMC, there were 243 cases of grade I stage Ia endometrioid P value periprostatic fat periprostatic fat adenocarcinoma. Of these, 85 had lymph node dissections, 37 had omental and/or Number of Patient 27 5 peritoneal biopsies. Peritoneal washes were performed on all patients and 12 were Age 0.79 positive for tumor. Angiolymphatic invasion was present in 9 patients, lower uterine mean 60 59.2 range 49-75 50-62 segment involvement was present in 5 (3 -epithelial only, and 2 - invasive) and prostate weight 0.33 endocervical gland involvement in 2. From these, only 9 patients experienced recurrent mean 45.1 55.6 disease (4%), the majority in the vaginal cuff (67%). Non-myoinvasive tumors accounted range 23-123 40-75 for 5 cases and 4 patients had superfi cial (<50%) invasion. Angiolymphatic invasion postoperative Gleason 0.01 score was present in 2 patients, lower uterine segment invasion in one and one patient had a 3+3 7 0 positive peritoneal wash. None of the patients had post-hysterectomy treatment. After 3+4 12 0 recurrence, 7 patients had pelvic and vaginal radiation therapy, 2 chemotherapy (1 4+3 4 4 with radiation); 1 has not received therapy yet. Average follow-up time was 20 months >4+3 4 1 Seminal vesicle (39 to 8 months), 2 were lost to followup. Six patients had NED, 1 died with disease. 6 4 0.01 invasion (+) Conclusions: The majority of patients with grade I and stage Ia endometrial Extracapsular 2 5 0.00001 adenocarcinoma have an excellent outcome with no treatment. Rare cases have invasion (+) recurrence of disease. Treatment after recurrence in our study resulted in good clinical Surgical resection 7 5 0.001 margin (+) outcomes for patients where long term followup was available. Further analysis is need Pathology stage 0.001 in order to determine why some patients recur after surgery while the majority do not. pT2 22 0 pT3a 2 1 pT3b 3 4 1129 Uterine Serous and FIGO 3 Endometrioid Carcinomas: A Multi- Conclusions: Despite the relative low incidence of positive periprostatic lymph node, Institutional Comparative Study of 335 Cases routine pathological work up of periprostatic fat pads should be performed to guarantee QF Ahmed, YR Hussein, J Bennett, K Van De Vijver, S Thomas, B Alosh, E Abdulfatah, adequate lymph node staging. D Schultz, S Bandyopadhyay, R Soslow, E Oliva, R Ali-Fehmi. WSU, Detroit, MI; Henry Ford Hospital, Detroit, MI; MGH, Boston, MA; MSKCC, New York, NY. Background: Although uterine serous carcinoma (USC) and FIGO grade 3 endometrioid 1127 Immunoexpression of Napsin A in Renal Neoplasms carcinoma(E3C) constitute a minority of all endometrial carcinomas, they account for B Zhu, SM Rohan, D DeFrias, X Lin. University of Illinois at Chicago, Chicago, IL; a disproportionate number of deaths. The study aimed to compare clinicopathologic Northwestern University, Chicago, IL. features and outcome of USC E3C. Background: Immunohistochemistry (IHC) for Napsin A has been widely used to Design: 335 endometrial carcinomas were identifi ed from 4 institutions. Only E3C support a diagnosis of lung adenocarcinoma with high sensitivity (93.9%). Previous and USC reviewed and agreed on by 2 GYN pathologists(average of 4 slides/case) reports have stated that Napsin A is also highly specifi c for lung adenocarcinoma (up to using WHO criteria were included in the study. 99 E3C and 167 USC were included 94.7%). However, a recent report demonstrated that Napsin A is expressed in papillary in the fi nal cohort. Clinicopathologic variables were analyzed, including patient renal cell carcinoma (RCC). In this study, we evaluated the immunoexpression of demographics, tumor type, myometrial invasion, lymphovascular invasion(LVI), Napsin A in renal neoplasms. cervical involvement(CI), lymph node(LN) status, FIGO stage, recurrence overall Design: Duplicate tissue microarrays (TMA) of 159 surgically excised renal neoplasms survival. of various types were constructed. IHC for Napsin A was performed on TMAs with Results: Median age of patients with E3C and USC was 61 69 yrs, respectively. Outer appropriate positive and negative controls. Tumors with more than 10% cells staining half myometrial invasion was identifi ed more often in E3C compared to USC(p=.001). positive for Napsin A were considered as immunoreactive. Absence of myometrial invasion was seen more frequently in USC(p=.002). CI(p=.015), Results: See Table 1. metastases to fallopian tubes(p=.001) recurrence(p=.001) were seen more frequently Table 1. Expression of Napsin A in renal neoplasms. in USC. Although there was no signifi cant difference in LVI,a higher number of positive Neoplasm No. Napsin A (%) LNs was identifi ed in E3C(p=.001). Omental involvement was seen more in USC than Acquired cystic disease associated RCC 2 100.0 Chromophobe RCC 45 11.1 E3C(p=.05). Early FIGO stage(I-II) was seen more frequently in E3C, whereas more Clear cell RCC 23 43.5 cases of advanced stage (stage IV) were seen in USC(p=.009).There was no statistical Clear cell papillary RCC 19 47.4 difference in overall survival between the 2 cohorts matched by stage(p=.264) Metanephric adenoma 3 100.0 Mucinous tubular and spindle cell carcinoma 1 0.0 Oncocytoma 23 56.5 Papillary RCC 37 83.8 TFE/MITF RCC 1 0.0 Urothelial carcinoma 6 0.0 Conclusions: Napsin A is expressed in various types of renal neoplasms with sensitivity up to 100.0%. It is, sometimes, diffi cult to distinguish oncocytoma from chromophobe RCC on fi ne needle aspiration and/or needle core biopsy of a renal tumor. IHC for Napsin A may be useful in distinguishing oncocytoma from chromophobe RCC with positive labeling favoring oncocytoma. Based on our results, Napsin A is not specifi c for lung adenocarcinoma. When an metastatic carcinoma of unknown primary is positive for Napsin A, the differential diagnosis should include tumors of both renal and lung origin. 274A ANNUAL MEETING ABSTRACTS Clinicopathologic features 1131 Impact of Histological Subtype in Early Stage Cervical Cancer: A E3C,n=99(%) USC,n=167(%) p value Multi-Instituitional Study Median Age 61y 69y B Alosh, I Alvarado-Cabrero, I Winer, S Thomas, D Schultz, R Ali-Fehmi. WSU, Detroit, Race* .121 MI; Mexican Oncology Hospital, Mexico, Mexico. AA 18(42.9) 64(55.7) Other 24(57.1) 51(44.5) Background: Cervical adenocarcinomas(ADC) are viewed as more aggressive than cervical squamous cell carcinomas(SCC). This study aimed to determine the impact Myometrial Invasion .002 of SCC vs. ADC in early stage(ES) cervical cancer. Yes 90(90.9) 126(75.4) Design: 283 patients(pts) diagnosed with ES (IA1-IB2) cervical ADC(132) No 9(9.1) 41(24.6) SCC(151) during 2000-2010 from 2 inner city hospitals (Mexico and Detroit) was Depth of Invasion* .001 included.Age,stage,tumor size,depth of invasion,lymphovascular invasion (LVI),lymph None 0(0) 41(24.6) node status (LNS),recurrence rate(RR) overall survival(OS) were analyzed.GYN Outer half