Radical versus Local Surgical Excision for Early Rectal Cancer: A Systematic Review and Meta-Analysis

Background

Radical excision (RE) for rectal cancer carries a higher risk of mortality and morbidity, while local excision (LE) could decrease these postoperative risks. However, the long-term benefit of LE is still debatable.

Aim

To study the effectiveness of LE versus RE in T1 and T2 rectal cancer.

Methods

A systematic review and meta-analysis was conducted using key databases like PubMed and ClinicalTrials.gov. Only cohort studies and randomized controlled trials were included. RevMan 5.4 tool was used for data analysis. Both clinical and statistical heterogeneity of the studies were assessed, and I2 >75% was considered as highly heterogeneous. The primary outcomes being measured were 5-year overall survival (OS) and 5-year disease free survival (DFS). A subgroup analysis of patients with T1-only was also conducted, without adjuvant chemo/radiotherapy.

Results

A total of 18 studies were included for final meta-analysis. Four were RCTs, while the other 15 were retrospective cohort studies. One included study had data from both RCT and non-RCT study groups. Nine studies were multicentered or national studies while nine were unicentral.There was no difference in risk ratio (RR) between OS: RR 0.95, 95% Confidence Interval (CI) [0.91, 0.99] and DFS: RR 0.93, 95% CI [0.87, 1.01]. There were lower hazards ratios in OS: RR 1.41, 95% CI [1.14, 1.74] and DFS: RR 1.95, 95% CI [1.36, 2.78] with radical, as compared to LE. Lower recurrence rate was associated with RE. Random effect model was used due to clinical heterogeneity between studies (different surgical procedures, tumor staging, adjuvant chemo or radiotherapy).

Conclusions

LE for early-stage rectal cancer has lower 5-year OS and DFS than RE, with higher local recurrence rate. However, LE is associated with lower early postoperative mortality, morbidity and length of stay as compared to RE.

Circulating Tumor DNA as a Minimal Residual Disease Assessment and Recurrence Risk in Patients Undergoing Curative-Intent Resection with or without Adjuvant Chemotherapy in Colorectal Cancer: A Systematic Review and Meta-Analysis

Emerging data have suggested that circulating tumor DNA (ctDNA) can be a reliable biomarker for minimal residual disease (MRD) in CRC patients. Recent studies have shown that the ability to detect MRD using ctDNA assay after curative-intent surgery will change how to assess the recurrence risk and patient selection for adjuvant chemotherapy. We performed a meta-analysis of post-operative ctDNA in stage I-IV (oligometastatic) CRC patients after curative-intent resection. We included 23 studies representing 3568 patients with evaluable ctDNA in CRC patient post-curative-intent surgery. Data were extracted from each study to perform a meta-analysis using RevMan 5.4. software. Subsequent subgroup analysis was performed for stages I-III and oligometastatic stage IV CRC patients. Results showed that the pooled hazard ratio (HR) for recurrence-free survival (RFS) in post-surgical ctDNA-positive versus -negative patients in all stages was 7.27 (95% CI 5.49-9.62), p < 0.00001. Subgroup analysis revealed pooled HRs of 8.14 (95% CI 5.60-11.82) and 4.83 (95% CI 3.64-6.39) for stages I-III and IV CRC, respectively. The pooled HR for RFS in post-adjuvant chemotherapy ctDNA-positive versus -negative patients in all stages was 10.59 (95% CI 5.59-20.06), p < 0.00001. Circulating tumor DNA (ctDNA) analysis has revolutionized non-invasive cancer diagnostics and monitoring, with two primary forms of analysis emerging: tumor-informed techniques and tumor-agnostic or tumor-naive techniques. Tumor-informed methods involve the initial identification of somatic mutations in tumor tissue, followed by the targeted sequencing of plasma DNA using a personalized assay. In contrast, the tumor-agnostic approach performs ctDNA analysis without prior knowledge of the patient's tumor tissue molecular profile. This review highlights the distinctive features and implications of each approach. Tumor-informed techniques enable the precise monitoring of known tumor-specific mutations, leveraging the sensitivity and specificity of ctDNA detection. Conversely, the tumor-agnostic approach allows for a broader genetic and epigenetic analysis, potentially revealing novel alterations and enhancing our understanding of tumor heterogeneity. Both approaches have significant implications for personalized medicine and improved patient outcomes in the field of oncology. The subgroup analysis based on the ctDNA method showed pooled HRs of 8.66 (95% CI 6.38-11.75) and 3.76 (95% CI 2.58-5.48) for tumor-informed and tumor-agnostic, respectively. Our analysis emphasizes that post-operative ctDNA is a strong prognostic marker of RFS. Based on our results, ctDNA can be a significant and independent predictor of RFS. This real-time assessment of treatment benefits using ctDNA can be used as a surrogate endpoint for the development of novel drugs in the adjuvant setting.

Diagnostic Accuracy of Elastography and Liver Disease: A Meta-Analysis

BACKGROUND

Ultrasound-based transient elastography (TE) is a non-invasive alternative to liver biopsy for the staging of hepatic fibrosis due to various chronic liver diseases. This meta-analysis aims to assess the diagnostic accuracy of TE for detecting liver cirrhosis (F4) and severe fibrosis (F3) in patients with chronic liver diseases, in comparison to the gold standard liver biopsy.

METHODS

A systematic search was performed using PubMed search engine following Preferred Reporting Items for Systematic reviews and Meta-Analysis (PRISMA) guidelines from inception to May 2021. The meta-analysis studies evaluating the diagnostic accuracy of TE for severe fibrosis and cirrhosis were identified. We conducted a meta-meta-analysis to generate pooled estimates of the sensitivity, specificity, and diagnostic odds ratios (ORs) for F3 and F4 fibrosis stage.

RESULTS

We included five studies with a total of 124 sub-studies and 20,341 patients in our analysis. Three studies have reported the diagnostic accuracy of TE in detecting F3/severe fibrosis stage and found 81.9% pooled sensitivity (95% confidence interval (CI): 79.9-83.7%; P < 0.001) (I2 = 0%), 84.7% pooled specificity (95% CI: 81.3-87.6%) (I2 = 81%; P = 0.02). All five studies reported the diagnostic accuracy of TE in detecting F4/liver cirrhosis stage. We found 84.8% pooled sensitivity (95% CI: 81.4-87.7%) (I2 = 86.4%; P < 0.001), 87.5% pooled specificity (95% CI: 85.4-89.3%) (I2 = 90%; P < 0.001) and pooled diagnostic OR (41.8; 95% CI: 3.9 - 56.5) (I2 = 87%; P < 0.001).

CONCLUSIONS

Ultrasound-based TE has excellent diagnostic accuracy for identifying cirrhosis and liver fibrosis stages 3. Future studies should focus on estimating the diagnostic accuracy of other fibrosis stages in chronic liver disease patients. This will eventually decrease the risk associated with invasive liver biopsy.

Circulating tumor DNA (ctDNA) as a minimal residual disease (MRD) assessment and recurrence risk in patients undergoing curative intent resection with or without adjuvant chemotherapy in colorectal cancer: A systematic review and meta-analysis

3623

Background: Minimal residual disease (MRD) assessment may effectively detect cure in patients with colorectal cancer (CRC). Emerging data have suggested that circulating tumor DNA (ctDNA) can be a reliable biomarker for MRD in patients. Recent studies have shown the ability to detect MRD using ctDNA assay to assess recurrence risk and patient selection for adjuvant chemotherapy. We performed a systematic review and metanalysis of post operative ctDNA in Stage I-IV (oligometastatic) CRC patients after curative intent resection with or without adjuvant chemotherapy. Methods: We searched PubMed/Medline, EMBASE, Web of Science, Cochrane Library, and Google from inception to February 3, 2022 using keywords related to colorectal cancer, ctDNA, and MRD. The search also includes paper and conference presentations. The search resulted in 427 studies after removing the duplicates. Data were extracted to perform a meta-analysis using RevMan 5.4. software. Subsequent subgroup analysis was performed for stages I-III and oligometastatic stage IV CRC patients. Results: After the initial abstract screening, 48 studies were identified. The final review led to the inclusion of 27 studies representing 3459 patients with evaluable ctDNA, with 623 having +ve post-surgery ctDNA levels. Seven studies had analyses of patients specifically with oligometastatic disease, the rest 20 studies subdivided within stages I-III. The pooled HR for RFS in post-surgical ctDNA +ve vs -ve patients in all stages was 7.16 (95% CI 6.12-8.36) p <0.00001. Subgroup analysis revealed pooled HR = 8.27 (95% CI 6.16-11.09) and 6.07 (95% CI 4.54-8.13) for stage I-III and IV CRC, respectively. Only 11 studies did analysis for post adjuvant chemotherapy patients based on ctDNA status. The pooled HR for RFS in post-adjuvant chemotherapy ctDNA +ve versus -ve patients in all stages was 12.40 (95% CI 9.24-16.64) p <0.00001. Subgroup analysis revealed pooled HR = 13.95 (95% CI 9.08-21.43) and 11.39 (95% CI 5.99-21.66) for stage I-III and IV CRC, respectively. Conclusions: This is the largest and most current meta-analysis done on ctDNA levels as MRD assessment in CRC. Our analysis emphasizes that post operative ctDNA is a strong prognostic marker of RFS. Based on our results ctDNA can be a significant and independent predictor of RFS. Several ctDNA-based randomized adjuvant trials are ongoing internationally to confirm the clinical utility of ctDNA in colorectal cancer. [Table: see text]

Phase Ib/IIa trial of CEND‐1 in combination with neoadjuvant FOLFIRINOX-based therapies in pancreatic, colorectal, and appendiceal cancers (CENDIFOX)

TPS4195

Background: The efficacy of chemotherapy is often compromised due to poor penetration of drugs in solid tumors. The tumor microenvironment, which is characterized by dense extracellular matrix‐rich stroma that creates a physical barrier to penetration of anti‐cancer drugs, is especially pronounced in Pancreatic Ductal Adenocarcinoma (PDAC) and in peritoneal metastases from Colorectal/Appendiceal Adenocarcinoma. CEND‐1 is a tumor‐penetrating peptide (scientifically also known as iRGD) that has preclinically demonstrated to enhance the tumor penetration of chemotherapy agents through binding and activation of alphav-integrins and neuropilin‐1 (NRP-1). The 2-step mechanism leads to a higher delivery and concentration of chemotherapeutics selectively in the tumor, while sparing normal tissue. Hence CEND-1 therapy has the potential to improve the efficacy of anti‐cancer therapies and reduce side effects through increased tumor access, specificity, and sensitivity. We hypothesize that CEND‐1 may become a powerful adjuvant that safely enhances standard anti‐neoplastic therapy in the neoadjuvant setting for the above populations. Methods: A safety lead-in 6-9 patients (Phase Ib) will be followed by an open label, single arm, parallel (3 cohorts) Phase IIa study. A total of 50 patients (20 PDAC, 15 colorectal/appendiceal with peritoneal metastases, 15 oligometastatic colorectal) will be enrolled. A starting CEND-1 dose of 3.2 mg/kg in combination with the standard doses of FOLFIRINOX (+/- Panitumumab if RAS/RAF wild type) will be used for the safety lead-in. CEND-1 dose will be lowered for Phase IIa if > 1/6 patients experienced DLTs. Participants enrolled will receive standard doses of FOLFIRINOX q2w +/- Panitumumab q2w 6mg/kg IV q2w (14-day cycles) for Cycles 1-3. After a subsequent research biopsy, the CEND-1 + chemotherapy combo will be continued at RP2D q2w for cycles 4-6, followed by CEND-1 +/- Panitumumab ̃72h prior to resection. Assessment of tumor response using RECIST v1.1 will be done every 3 cycles. Up to 10 patients may receive Panitumumab. Eligible Pts are untreated, newly diagnosed, resectable/borderline resectable PDAC or colorectal/appendiceal adenocarcinoma with peritoneal metastases or oligometastases eligible for cytoreductive surgery, as determined by multidisciplinary evaluation. Inclusion criteria also include ECOG PS 0-1, adequate organ function, measurable or evaluable disease. Primary objectives are safety and biological activity of CEND‐1. Secondary objectives include ORR, R0 resection rate, DFS, OS. Exploratory objectives include pathologic response, tissue immune response, EGFR expression, tumor tissue-to-plasma concentration of Panitumumab pre and post CEND-1 treatment. Enrollment to the CENDIFOX trial is currently ongoing. Clinical trial information: NCT05121038.

Association of pathologic response and survival after peri-operative therapy in resected pancreatic adenocarcinoma: KU cancer center experience

e16254

Background: Neo-adjuvant therapy (NAT) and associated pathologic complete response (pCR) rates have correlated with improved survival in resected pancreatic ductal adenocarcinoma (PDAC). In this study, we explored the relationship between pathologic response, peri-operative therapy, and survival, especially the impact of change in adjuvant therapy in patients with no/poor path response to NAT. Methods: Retrospectively reviewed 66 PDAC patients who received NAT ± radiation and underwent resection at KU Cancer Center between 2011-2022. We compared DFS and OS between Path Responders vs Non-Responders based on standard Tumor Regression Scores from pathology reports. A subanalysis was performed in path non-responders based on switch in adjuvant therapy (AT) versus not. Results: Patient characteristics are summarized in the table. Among 66 PDAC patients, 50 (75.8%) achieved a path response (G0-G2), 16 (24.2%) experienced no/poor path response (G3). Of the 50 pts who achieved a path response, 4 (8.0%) had a complete path response (pCR; G0), 5 (10%) marked response (G1), 41 (82%) moderate response (G2). Median DFS (mDFS) was 17.3 months (95% CI: 12.7-22.4) in Path Responders vs 15.9m (95% CI: 9.6-35.8) in Non-Responders [p=0.59]. Median OS (mOS) was 32.9m (95% CI: 23.4-41.5) vs 27.7m (95% CI: 15.2-38.2), respectively [p=0.39). A sub-analysis in the Non-Responders (n=16) based on switch in AT (n=8) vs not (n=3), revealed mDFS 16.4m (95% CI: 9.6-41.8) when AT was switched vs mDFS 11.3m (95% CI: 5.9-16.6) when AT was not switched [p=0.24]; and mOS 30.6m (95% CI: 15.7-60.3) vs 17.2 months (95% CI: 6.7-27.7), respectively [p=0.18]. Conclusions: Our study found no statistical difference in DFS and OS between Pathologic Responders and Non-Responders to neo-adjuvant therapy. However, a sub-analysis within Pathologic Non-Responders revealed a longer DFS and OS after switching adjuvant therapy without reaching statistical significance, likely due to small sample size. Our findings warrant validation in a larger cohort as switch in adjuvant therapy could potentially change the treatment landscape for Pathologic Non-Responders.[Table: see text]

Radical versus local surgical excision for early rectal cancer: A systematic review and meta-analysis

3622

Background: Colorectal cancer is the third common cancer worldwide. Radical excision (RE) as total mesorectal excision for rectal cancer carries a higher risk of mortality and morbidity, while local excision (LE) could decrease these postoperative risks. However, the long-term oncologic outcomes of LE are still debatable. We aim to study the effect of LE versus RE in T1 and T2 rectal cancer. Methods: We conducted a systematic review and meta-analysis. We searched PubMed and CENTRAL databases, using an optimized search-strategy from inception until 15 June 2021, without restriction on publication date or status. We included only cohort and randomized controlled trials (RCTs). Two authors independently screened the title, abstracts, and full-text manuscripts for inclusion and data extraction. All included trials contained at least one of the primary outcomes. We used RevMan 5.4 tool for data analysis. We calculated both hazards ratio (HR) and risk ratio (RR) for the 5-years survival analyses, with their 95% confidence intervals (CI). We assessed both clinical and statistical heterogeneity of the studies; I2 >75% was considered highly heterogeneous. We used random effect model (REM). We used standardized mean difference (SMD) for hospitalization days. We conducted a subgroup analysis of patients with T1-only without adjuvant chemo/radiotherapy (CRT). Results: We retrieved from the search a total of 1243 reports. A total of 18 studies were included for final meta-analysis (4 RCTs and 14 retrospective cohorts). Nine studies were multi-central while ten were unicentral studies. We did not find any difference in risk ratio (RR) between overall survival (OVS) and disease-free survival (DFS). But there were higher HRs in OVS and DFS with LE as compared to RE. A higher recurrence rate was also seen with LE. Six studies showed absent 30-days postoperative mortality in both groups so we used peto-odds ratio. Postoperative mortality and morbidity were lower with LE rather than RE. Conclusions: LE for early stage rectal cancer has a higher risk of decreased 5-year OVS and DFS than RE, with higher local recurrence rate. However, LE is associated with lower early postoperative mortality, morbidity, and hospitalization days, as compared to RE. Patient selection is key to balance these risks for the optimal outcome. [Table: see text]

Vitamin D: The Missing Nutrient Behind the Two Deadly Pandemics, COVID-19 and Cardiovascular Diseases

The coronavirus (COVID-19) pandemic is claiming millions of lives and creating an additional burden on health care, which is already affected by the rise of non-communicable diseases (NCDs). The scientific community, on the other side, is enormously engaged with studies to best identify the characteristics of the virus and minimize its effect while supporting the fight to contain NCDs, mainly cardiovascular diseases (CVDs), which are contributing hugely to the global death toll. Hence, the roles of vitamin D in COVID-19 immunity and cardiovascular health are gaining traction recently. 

This literature review will mainly focus on summarizing pertinent studies and scientific publications which highlight the association of vitamin D levels with the various outcomes of COVID-19 and CVDs. It will also address how low vitamin D correlates with the epidemiology of CVDs and the inflammatory mechanisms attributed to COVID-19 severity. We believe that our review may open up hindsight perspectives and further discussions among the physicians in tapping the potential of vitamin D supplementation to tackle the morbidity, mortality, and health care cost of the two deadly diseases, COVID-19 and CVDs. 

Social Media and Professional Development for Oncology Professionals

The use of social media continues to increase in health care and academia. Health care practice, particularly the oncologic field, is constantly changing because of new knowledge, evidence-based research, clinical trials, and government policies. Therefore, oncology trainees and professionals continue to strive to stay up-to-date with practice guidelines, research, and skills. Although social media as an educational and professional development tool is no longer completely new to medicine and has been embraced, it is still under-researched in terms of various outcomes. Social media plays several key roles in professional development and academic advancement. We reviewed the literature to evaluate how social media can be used for professional development and academic promotion of oncology professionals.

Cancer Prevalence in E-Cigarette Users: A Retrospective Cross-Sectional NHANES Study

Background

It is well known that traditional smoking causes various types of cancer, leading to the current decline in traditional smoking among US adults from 20.9% in 2005 to 14.0% in 2019. Electronic cigarettes (e-cigarettes) are commonly marketed as a safe alternative and gaining popularity especially among never-smokers and adolescents. However, there is limited evidence of effects of e-cigarette on cancer. Hence, we aim to find the prevalence and association of e-cigarette and traditional smoking among cancer respondents.

Methods

We conducted a retrospective cross-sectional study using the NHANES database from 2015 to 2018. We assessed history of cancer (MCQ220), type of cancers (MCQ230a), and smoking status (e-cigarette: SMQ900 or SMQ905 and traditional smoking: SMQ020) using questionnaires. We performed multivariable logistic regression models to find the association of e-cigarette use, traditional smoking, and no smoking with cancer after adjusting for confounding variables.

Results

A total of 154,856 participants were included, of whom 5% were e-cigarette users, 31.4% were traditional smokers, and 63.6% were nonsmokers. There is a higher prevalence of e-cigarette use among younger participants, females (49 vs. 38) in comparison to traditional smokers (P < 0.0001). The e-cigarette users have lower prevalence of cancer compared to traditional smoking (2.3% vs. 16.8%; P < 0.0001), but they were diagnosed with cancer at a younger age. Among cancer subtypes, cervical cancer (22 vs. 2.6), leukemia (8.5 vs. 1.1), skin cancer (non-melanoma) (15.6 vs. 12.3), skin (other) (28 vs. 10) and thyroid (10.6 vs. 2.4) had higher prevalence of e-cigarette use compared to traditional smokers (P < 0.0001). Our regression analysis showed that e-cigarette users have 2.2 times higher risk of having cancer compared to non-smokers (odds ratio (OR): 2.2; 95% confidence interval (CI): 2.2 - 2.3; P < 0.0001). Similarly, traditional smokers have 1.96 higher odds of having cancer compared to nonsmokers (OR: 1.96; 95% CI: 1.96 - 1.97; P < 0.0001).

Conclusion

In our study, e-cigarette users had an early age of cancer onset and higher risk of cancer. Hence, this is stepping stone for future research to evaluate the safety and effects of e-cigarettes in patients with cancer.

Kidney disease and COVID-19 disease severity-systematic review and meta-analysis

We aimed to identify prevalence and association of comorbid chronic kidney disease (CKD), acute kidney injury (AKI) and utilization prevalence of continuous renal replacement therapy (CRRT) in COVID-19-hospitalized patients as a function of severity status. With the ongoing struggle across the globe to combat COVID-19 disease, published literature has described the role of kidney disease in COVID-19 patients based on single/multicenter experiences across the globe. We extracted data from observational studies describing comorbid CKD, AKI and CRRT and outcomes and severity of COVID-19-hospitalized patients from December 1, 2019-August 20, 2020 following PRISMA guidelines. Severity of COVID-19 includes intensive care unit admission, oxygen saturation < 90%, invasive mechanical ventilation utilization, in-hospital admission and mortality. Meta-analysis was performed using a random-effects model to calculate pooled estimates, and forest plots were created. In total, 29 studies with 15,017 confirmed COVID-19 patients were included. The overall prevalence of AKI was 11.6% [(430/3693)], comorbid CKD 9.7% [(1342/13,728)] and CRRT 2.58% [(102/3946)] in our meta-analysis. We also found higher odds of comorbid CKD (pooled OR: 1.70; 95%CI: 1.21-2.40; p = 0.002), AKI (8.28; 4.42-15.52; p < 0.00001) and utilization of CRRT (16.90; 9.00-31.74; p < 0.00001) in patients with severe COVID-19 disease. Conclusion Our meta-analysis suggests that comorbid CKD, AKI and utilization of CRRT were significantly associated with COVID-19 disease severity. Clinicians should focus on early triaging of COVID-19 patients with comorbid CKD and at risk for AKI to prevent complication and mortality.

A Case Report of COVID-Associated Catastrophic Antiphospholipid Syndrome Successfully Treated with Eculizumab

Antiphospholipid syndrome (APS) is an autoimmune disorder characterized by multiple episodes of venous and arterial thromboses or recurrent fetal losses in the presence of antiphospholipid antibodies against β₂GP1, frequently accompanied by moderate thrombocytopenia. Catastrophic APS (CAPS) is a severe manifestation of APS. COVID-19 may have an intense hypercoagulable state in critically ill patients. SARS-CoV2 may potentiate pathogenic APS effects, including the activation of endothelial cells, monocytes, platelets, and complement, resulting in a proinflammatory state and prothrombotic events. The endothelial tropism of SARS-CoV2 may also modify the clinical presentation of COVID-19 in susceptible individuals and trigger flares of underlying vascular diseases. We report a case of a 64-year-old woman with a history of triple-positive APS who had multiple thrombotic and bleeding episodes after being found to have a COVID-19 infection temporally associated with CAPS development that was successfully treated with eculizumab, preventing further macro- and microvascular thrombotic events at 1 month follow-up. Our case highlights the need for more research regarding the mechanism by which COVID-19 may potentiate APS and lead to the development of CAPS.

Abstract PO-085: Sex bias in COVID-19-associated Illness severity and mortality in cancer patients: A systematic review and meta-analysis

Importance: There is strong evidence that COVID-19 is associated with higher morbidity and mortality in males compared to females in the general population. However, whether the same sex bias exists in the cancer patient population is unknown. Several published studies have examined this question, but the results are inconclusive and inconsistent and the association remains unclear.

Objective: To evaluate the sex differences in the risk of severe illness and mortality attributable to COVID-19 in the cancer patient population.

Data Sources: Published articles that evaluated clinical outcomes associated with severe illness or death attributable to COVID-19 in the cancer patient population from inception to June 1, 2020, were identified by searching PubMed and EMBASE, as well as the ASCO 2020 Virtual Annual Conference, ESMO conferences held from January 2020 to June 1, 2020, and the preprint databases medRxiv and bioRxiv.

Study Selection: Prospective or retrospective analyses, studies published in English, providing clinical outcomes data with sex differences in the cancer patient population.

Data Extraction and Synthesis: Author, date of publication, country, type of studies, median and range of age, cancer types included in the studies, definitions of clinical outcomes, and the odds ratios (OR) for severe illness or death attributable to COVID-19 were retrieved. Where OR data were not available, raw data were used to calculate the OR in a univariate analysis model and included in the meta-analysis.

Main Outcome(s) and Measure(s): The primary outcome of interest was OR of (1) severe illness, (2) death, and (3) composite outcome of severe illness and death attributable to COVID-19 in males versus females.

Results: Overall, 2,764 patients (9 studies) were analyzed in retrospective study settings. Of the included studies, two studies were multinational whereas the rest were conducted in China (4), France (1), United Kingdom (1), and United States (1). Median ages were similar across studies (range 62-70). Three studies reported outcomes for death and six studies reported outcomes for severe illness. Of the seven studies, all but one defined severe illness as illness requiring ICU admission or leading to death and attributable to COVID-19. Pooled ORs for the composite outcome was 1.68 (95% CI, 1.27-2.24), death was 1.98 (95% CI, 1.21-3.26), and severe illness was 1.48 (95% CI, 1.05-2.10), all disfavoring males. Random effects model was used with the Dersimonian-Laird Model throughout analyses and significant heterogeneity was subsequently confirmed (I2, 48.1%; tau2, 0.0816). No significant between-study bias was detected per Begg’s funnel plot.

Conclusions and Relevance: The male sex was associated with higher risk of severe illness, death, and the composite outcome of both attributable to COVID-19. This finding has implications in informing the clinical prognosis and decision making regarding oncologic patients.

Citation Format: Robin Park, Anusha Chidharla, Kathan Mehta, Weijing Sun, Anup Kasi. Sex bias in COVID-19-associated Illness severity and mortality in cancer patients: A systematic review and meta-analysis [abstract]. In: Proceedings of the AACR Virtual Meeting: COVID-19 and Cancer; 2020 Jul 20-22. Philadelphia (PA): AACR; Clin Cancer Res 2020;26(18_Suppl):Abstract nr PO-085.

Oxaliplatin-associated sarcoid-like reaction masquerading as recurrent colon cancer

A 54-year-old man with stage IV B metastatic colorectal cancer with liver and peritoneal metastasis was treated with cytoreductive surgery (extended left colectomy, right partial hepatectomy, resection of right diaphragm nodule) and perioperative oxaliplatin-based chemotherapy. The patient was cancer-free for 6 months, at which point a surveillance positron emission tomography-CT scan showed metabolically active hepatosplenic lesions and mediastinal and bilateral hilar lymph nodes. An endobronchial ultrasound bronchoscopy-guided fine needle aspiration of the mediastinal and hilar lymph nodes revealed non-necrotising granulomas. The workup was negative for bacterial, fungal or mycobacterial infection, cancer or autoimmune disease. Carcinoembryonic antigen and COLVERA (a circulating tumour DNA liquid biopsy test for the detection of recurrent colon cancer) tests were negative. Subsequently the rare diagnosis of a sarcoidosis-like reaction from oxaliplatin-based chemotherapy was made. Repeat imaging after 3 months showed resolution of the hepatosplenic lesions and lymphadenopathy, alike.

Sex-bias in COVID-19-associated illness severity and mortality in cancer patients: A systematic review and meta-analysis

BACKGROUND

Whether there is sex-bias within the adverse outcomes associated with COVID-19 in the cancer population is unknown. In this regard, several published studies have examined this question, but the results are inconclusive and inconsistent. To evaluate the sex-difference in the risk of adverse outcomes associated with COVID-19 in the cancer population, we have conducted a systematic review and meta-analysis.

METHODS

Published articles evaluating adverse outcomes associated with COVID-19 in the cancer population from inception to June 2020 were identified by searching PubMed and EMBASE, ASCO 2020 Virtual Annual Conference, AACR 2020 COVID-19 and Cancer, ESMO conferences held from January to June 2020, and medRxiv and bioRxiv. Prospective or retrospective analyses in English, providing outcomes data with sex differences in the cancer population were included. The primary outcomes of interest were pooled ORs of severe illness, all-cause death, and the composite of severe illness and death attributable to COVID-19 in males versus females in cancer patients.

FINDINGS

Overall, 3968 patients (17 studies) were analyzed in retrospective study settings. Overall, pooled ORs of the composite of severe illness and all-cause death in the setting of COVID-19 in males versus females was 1.60 (95% CI, 1.38-1.85). The risk of severe illness or death were both independently increased in males versus females.

INTERPRETATION

Male sex was associated with a higher risk of severe illness and death attributable to COVID-19. This finding has implications in informing the clinical prognosis and decision making in the care of cancer patients.

FUNDING

This study received no funding.

A woman with dyspnea and recurrent pneumothorax: when dyspnea is not asthma

Lymphangioleiomyomatosis (LAM) is a rare disease characterized by cystic lung lesions, lymphatic abnormalities, and angiomyolipomas. It can take a significant amount of time to diagnose LAM due to the vague symptoms of fatigue, progressive dyspnea, pneumothorax, and pleural effusion. We present a case of a 29-year-old woman with recurrent spontaneous pneumothorax and progressive dyspnea who was initially misdiagnosed with asthma and was later found to have LAM. As with all rare diagnoses, there needs to be a suspicion of the disease in order for a further workup to be initiated. In patients with a compatible High-resolution CT scan of the chest, a high vascular endothelial growth factor-D (VEGF-D) value is diagnostic for LAM, and no other confirmatory test is needed.

ALK alteration association with prognosis in metastatic colorectal cancer: A single institution retrospective cohort study

676

Background: The Anaplastic Lymphoma Kinas (ALK) gene is altered in various malignancies which can be targeted with several inhibitors. However, the incidence of mutations in ALK are not well defined in colorectal cancers (CRC). We aim to study the prevalence of ALK mutations in metastatic CRC (mCRC) patients and correlate with clinical outcomes. Methods: We retrospectively evaluated 54 mCRC patients treated with chemotherapy at Kansas University Cancer Center between June 2010 and September 2017 who underwent our inhouse targeted 17 gene next-generation sequencing test using an illumina MiSeq technology. The panel included AKT1, ALK, BRAF, EGFR, FLT3, HRAS, IDH1, IDH2, JAK2, KIT, KRAS, NPM1, NRAS, PDGFRA, PIK3CA, PTEN, and TP53 genes. We compared baseline characteristics, tumor location (left vs right) and clinical outcomes between patients with ALK mutations versus ALK wild type. Results: We retrospectively evaluated 54 mCRC patients treated with chemotherapy at Kansas University Cancer Center between June 2010 and September 2017 who underwent our inhouse targeted 17 gene next-generation sequencing test using an illumina MiSeq technology. We compared baseline characteristics, tumor location (left vs right) and clinical outcomes between patients with ALK mutations versus ALK wild type. Results: We found 10 pts (18.5%) with ALK mutations and compared with 44 patients that were ALK wild type. Demographic and baseline characteristics (ALK mutation/wild type) were as follows: Median age 61 vs 61 years, Gender (male): 80% vs 50%, Left sided tumor 70% vs 60%. Of 41 evaluable patients (ALK mutation vs wild type), Objective response rate (stable + partial response) was 50% vs 91% [p = 0.03], 6-month PFS 33% vs 77%, Median PFS 12 months vs 17.7 months [p = 0.2], Median OS was 14.5 months vs not reached [HR 28.98, p = 0.025]. Conclusions: Patients harboring ALK mutations had a statistically significant poorer objective response rate and OS compared to ALK wild type patients. Findings of our study highlight the importance of assessing ALK gene alteration as a prognostic biomarker for mCRC. Therefore ALK mutation appears to be poor prognostic factor and needs to be validated in larger cohorts.