327 Background: Advanced gastric cancer (GC) is a disease with high morbidity and poor prognosis. We hypothesize that different sites of metastasis have different impact in terms of symptoms and complications. We sought to evaluate if site specific morbidity in our patients impacted treatment and survival. Methods: Medical records from patients with advanced GC treated from Jan 2005 to Dec 2015 were retrospectively reviewed. Morbidity was defined as having any symptom by metastases in a specific site. OS was estimated by Kaplan Meier method and compared by Log-rank test. P value < 0.05 was considered significant. Results: We included 180 consecutive patients, median age at diagnosis was 56 years (21-90), 55% were women. Most common sites of metastases were: peritoneum 76.1%, non-regional lymph nodes 38.9%, liver 22.8%, lung 26.7%, bone 9.4% and ovary 12.8%. Regarding morbidity, at diagnosis 68% of patients presented morbidity by the primary tumor: obstruction 56%, bleeding 27%, obstruction and bleeding 3%, other 14%. Disease by peritoneum caused morbidity in 30%, by lung in 8%, by ovarian in 4.4%, by lymph nodes in 3.3%, and by other sites in 5.6% of patients. OS in the global cohort was: 3.53 months (2.2 to 4.8), nevertheless by univariate analysis we found that OS was affected by morbidity at some sites as it is show in table. More patients with peritoneal morbidity could not receive treatment vs those without peritoneal morbidity (p = 0.042). Conclusions: We found that morbidity in peritoneum, lung and ovary adversely affected prognosis of patients with advanced GC. Moreover, peritoneal morbidity preclude patients from receiving oncological treatment. [Table: see text]
590 Background: universal screening has been proposed as an alternative to clinical criteria for detection of Lynch syndrome (LS). Results of such policy have not been evaluated in mexican population with low incidence of colo-rectal cancer (CCR). Objective: to determine the proportion of patients tested by immunohistochemistry (IHC) for mismatch repair-deficient (dMMR) and characterize subsequent molecular and clinical work up for abnormal results. Methods: we identified all consecutive cases of CCR during 2016 at Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico. We recorded clinical variables, IHC for mismatch repair (MMR) proteins and/or clinical genetics evaluation and molecular confirmation of LS if available. Results: universal screening policy was adopted by our institution in 2016. 209 CRC patients had an outpatient consultation. The median age at diagnosis was 59.8 years. 103 IHC for MMR proteins were done (49%) regardless of age at diagnosis and a family history of CRC. 36/103 (35%) IHC showed abnormal result meaning lack of expression of at least one of four MMR proteins: 26 MLH1, 7 MSH2, 10 MSH6 and 23 PMS2. 11/36 patients (30%) had a family history of CRC. 26/36 (72%) were evaluated by clinical genetics service. Of 26 MLH1 deficient patients, only one case was tested for BRAF mutation. 14/36 patients (39%) were tested by sequencing analysis: 7 MLH1, 5 MSH2, 1 MSH6, 1 PMS2. 2/14 patients were tested by MLPA assay given negative sequencing analysis. Germ-line mutations were identified in 7/36 patients (19%). All mutations were identified in patients with a clinical suspicion given strong family history of CRC. No identified mutations could be attributed to universal screening policy. Conclusions: during the first year of implementing universal screening for LS in CRC patients only half of the patients were screened by IHC. Despite MLH1/PMS2 deficiency was the most frequent abnormality, BRAF mutation analysis was not performed as recommended, given the lack of access to the test. A clinical suspicion of LS was a determinant driver for confirmatory molecular testing therefore limiting the usefulness of universal screening.
518 Background: gallbladder cancer is the most common malignancy of the biliary tract. Treatment modalities and outcomes for this disease in Mexican population have been infrequently reported. Methods: we retrospectively reviewed medical records from 61 patients with histologically confirmed gallbladder cancer treated at Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán from January 2005 to December 2015.Clinical and pathological information was recorded. Survival was estimated by Kaplan Meir method and compared by Log rank test. Results: we found 68.9% women and 31.1% men, with a median age of 68 years (32-93). Clinical stage was advanced in 65.6% (n=40), regional in 23% (n=14), localized in 4.9% (n=3) and in situ in 6.6% (n=4). For patients with localized disease (n=21), which included in situ, localized and regional disease, a potentially curative surgery was attempted in 100% of patients, achieving a R0 resection in 47.6% (n=10) of cases. The morbidity rate was 33.3% (n=7). There were 5 surgical deaths. For advanced disease (n=40), the initial treatment was: 42.5% (n=17) palliative surgery, 25% (n=10) palliative care and for 30% (n=12) systemic chemotherapy, more frequently gemcitabine plus cisplatin (n=7). At progression seven patients received second-line chemotherapy. Median overall survival (OS) in the global cohort was 5.6 months (IC 95, 2.4-8.77). According to clinical stage survival at 5 years was 100% for in situ and 67% for localized disease. Median survival was 6.3 months (IC 95, 2.3-10-3) for regional disease and 4.2 months (IC 95, 1.1-6.4) for advanced disease. For patients with localized disease not achieving R0 resection (p=0.03) and perineural invasion (p=0.025) were associated with decreased survival. For patients with advanced disease poor performance status (p=0.004) and absence of chemotherapy (p=0.002) were adverse prognostic factors. Conclusions: global poor outcomes may be explained by metastatic disease at presentation. Even for patients with apparent localized disease, a potentially curative resection could be offered to only half of the patients.
319 Background: gastric cancer is common in Mexico. Evaluation of treatment strategies is greatly important in early gastric cancer. National institutions rarely report their outcomes, limiting feedback and policy improvements. Methods: single-center retrospective review of patients with histologically confirmed localized gastric cancer diagnosed from Jan 2005 to Dec 2017. Overall survival (OS) and recurrence-free survival (RFS) were estimated by Kaplan-Meier curves and compared with log-rank rest. A p value < 0.05 was significant. Results: we included 78 cases, median age 63 years, 52.6% men. Surgery was the initial treatment in 46 patients (59%) and 87% achieved R0 resection. Adjuvant treatment was administered to 63% of patients. 29 patients (37.2%) started perioperative chemotherapy with 86.2% of them being resected, and 75.9% having R0 resection. 13 patients (44.8%) also received postoperative chemotherapy. Better performance status (p=0.036) and lower albumin levels (p=0.039) were found in patients with initial surgery vs those with perioperative chemotherapy. At the time of surgery, most patients had stage III disease in both groups but 5 patients had M1 disease despite negative initial laparoscopy in the chemotherapy group and 5 patients did not require aduvant tx given early stage in the surgery first group. Median OS and RFS are reported in table. Conclusions: Most patients in our center undergo initial surgery. We report a differential survival according to initial treatment. More advanced disease in chemotherapy first group may explain differences. Given non-random assignment, we could not show survival benefit of chemotherapy treated patients. [Table: see text]
e13518 Background: COVID-19 detection in a timely manner in patients (pts) undergoing anticancer treatment is essential. RT-PCR test for SARS-CoV2 is the diagnostic gold standard, however it is a potentially limited resource in our setting. As an alternative, clinicians have developed symptom-based questionnaires as a screening tool for the detection of COVID-19 to optimize resources. The predictive efficacy of these tools in pts with cancer and healthcare personnel (HCP) who treat them has not been evaluated. Our objective was to describe the findings of the follow-up through an online clinical tool in our cohort, and determine its predictive performance compared against the gold standard. Methods: Data was obtained from a follow-up cohort of HCP and pts attending the chemoradiotherapy unit of a tertiary hospital designated as a COVID-19 priority facility in Mexico City . The follow-up period was from June 12 to September 30, 2020, and consisted of a 10-item clinical questionnaire (CQ) on respiratory symptoms and contact with patients diagnosed with COVID-19, collected daily electronically or by telephone . In addition, RT-PCR for SARS-CoV2 was performed every two weeks. The CQ was considered as a positive screening test if in the period between the biweekly RT-PCRs the participants had reported symptoms or contact. Results: We included 130 asymptomatic participants. 44.6% (n = 58) were HCP and 55.3 % (n = 72) were pts. Within a median follow-up of 85 days (IQR 48-103) a total of 8970 CQ were completed, 48.3% (n = 4335) were answered by HCP and 51.6% (n = 4635) by pts. 4.03% (n = 175) of CQ returned positive in HCP and 0.77% (n = 36) in pts. 634 nasopharyngeal swabs for SARS-CoV-2 RT-PCR were performed, 13.5% (n = 18) of the participants tested positive for SARS-CoV2 infection. When we evaluate within the biweekly period, the CQ for symptoms or contact was found to be a positive screening test in 12% (n = 78). If we applied the standardized definition of COVID-19 suspicious case used at our center, the CQ was found to be positive just in 3.9% (n = 25). The CQ as a general screening tool gave a sensitivity (SN) of 33.3%, specificity (SP) of 88.3%, a positive predictive value (PPV) of 7.6% and a negative predictive value (NPV) of 97.8%. Using the standardized definition, CQ gave a SN of 38.8% and a SP of 97.07%, a PPV of 28% and a NPV of 98.1%. Conclusions: Screening based on self-reporting of symptoms and contact through a questionnaire demonstrated low sensivity but high specificity in our cohort. When we applied a standardized definition of COVID-19 suspicious case, the clinical performance improved. RT-PCR testing remains as the gold standard to detect COVID-19 and should be preferred in patients undergoing anticancer treatment. Nevertheless, clinical questionnaires are an accessible tool for follow-up.
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