Publications by authors named "Ryan Roop"

7 Publications

  • Page 1 of 1

Effect Of Leaf Extract On Platelet Count In Chronic Immune Thrombocytopenic Purpura: A Case Series.

Integr Med (Encinitas) 2019 Oct;18(5):30-35

Kalispell Regional Medical Center, Kalispell, Montana, USA.

The leaves of have been used to treat thrombocytopenia in Dengue fever in areas where the virus is endemic. This case series describes the use of leaf liquid extract (CPLE) as an adjunctive therapy for four patients receiving standard-of-care treatment for chronic immune thrombocytopenic purpura (ITP). The cases presented here indicate that CPLE may prove beneficial in the management of chronic ITP for patients interested in alternative therapy before progressing to second-line treatments. A larger clinical trial is warranted to evaluate CPLE as an adjunctive therapy in chronic ITP.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7219447PMC
October 2019

Short- and Long-term weight changes among United States veterans with diffuse large B-cell lymphoma treated with CHOP chemotherapy.

Leuk Lymphoma 2016 Feb 25;57(2):313-319. Epub 2015 Jul 25.

a Research Service, St. Louis Veterans Affairs Medical Center , St. Louis , MO , USA.

Identifying weight changes associated with treatment of diffuse large B-cell lymphoma (DLBCL) has the potential to improve the long-term health of survivors. A retrospective cohort of United States veterans with a new diagnosis of DLBCL between October 1, 1998 and September 30, 2008, with follow-up until April 23, 2013, was assembled. Weight changes were evaluated before, during, and after treatment in 1935 DLBCL patients who received cyclophosphamide, doxorubicin, vincristine, and prednisone, with or without rituximab (CHOP+/- R). One year prior to treatment, 79% of patients were obese or overweight. During the 12 months leading up to treatment, 57% of the cohort lost weight. Among patients surviving 24 months after treatment initiation, weight increased an average of 2.9 kg above weight at treatment completion. The weight change trends observed in these DLBCL patients suggest that weight management strategies may be an important part of long-term survivorship planning after conclusion of treatment.
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http://dx.doi.org/10.3109/10428194.2015.1056183DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4752439PMC
February 2016

Comparative effectiveness of anthracycline-containing chemotherapy in United States veterans age 80 and older with diffuse large B-cell lymphoma.

J Geriatr Oncol 2015 May 19;6(3):211-8. Epub 2015 Jan 19.

Division of Public Health Sciences, Washington University School of Medicine, 660 S. Euclid Ave., St. Louis, MO 63110, USA.

Objectives: While anthracycline-based treatment can cure diffuse large B-cell lymphoma, most patients over age 80 do not receive doxorubicin due to toxicity concerns. This study evaluated this practice, as patients age 80 and older are largely excluded from clinical trials. The primary outcome of interest was overall survival. Secondary outcomes included treatment-related mortality and anthracycline dose intensity.

Materials And Methods: We assembled a cohort of 530 newly diagnosed diffuse large B-cell lymphoma patients age 80 or older diagnosed within United States Veterans Health Administration. Treatment and survival information were obtained to determine associations between anthracycline use, dose intensity, treatment-related mortality and overall survival.

Results: Of the 530 patients, 285 received systemic treatment and 193 received an anthracycline. After controlling for potential confounders, rituximab decreased mortality (hazard ratio, 0.62; 95% confidence interval [CI]: 0.44-0.88), while doxorubicin was not significantly associated with mortality (hazard ratio, 0.87; 95% CI: 0.64-1.17). Completion of treatment with anthracycline dose intensity ≥85% of expected was only 14%. Patients treated with anthracycline dose intensity <85% had better one year survival compared to those treated at ≥85% (70% vs. 59%, p=0.029).

Conclusion: These results suggest that full dose anthracycline therapy may be less important in the treatment of diffuse large B-cell lymphoma patients over age 80. The low frequency of completion of full dose intensity treatment suggests that standard doses are an unrealistic standard of care for patients this age. Alternate treatment strategies and risk stratification should be considered for these patients.
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http://dx.doi.org/10.1016/j.jgo.2015.01.003DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4605388PMC
May 2015

A randomized phase II trial investigating the effect of platelet function inhibition on circulating tumor cells in patients with metastatic breast cancer.

Clin Breast Cancer 2013 Dec;13(6):409-15

Department of Medicine, Division of Oncology, Washington University School of Medicine in St. Louis, St. Louis, MO.

Background: Blockade of platelet activation and aggregation can inhibit metastasis in preclinical models and is associated with cancer prevention. To test whether disruption of platelet function with clopidogrel and aspirin would decrease the number of circulating tumor cells (CTCs) in patients with metastatic breast cancer, a randomized phase II study was performed.

Methods: Patients with metastatic breast cancer who were not currently receiving cytotoxic chemotherapy were eligible. Patients were randomized to receive either clopidogrel and aspirin or to a control group receiving no treatment. Phlebotomy was performed at baseline, at 2 and 4 weeks, and monthly thereafter to obtain specimens to assess CTC, platelet aggregation, and thrombin activity. The primary end point was the proportion of patients with detectable CTCs at 1 month.

Results: Forty-eight patients were enrolled and 42 were evaluable at 1 month. Baseline CTC numbers were ≥ 5 in 13% and ≥ 1 in 65% of patients. Despite adequate platelet function inhibition in the treatment group, the proportion of patients with detectable CTCs was similar between the clopidogrel/aspirin and control groups at baseline (P = .21) and 4 weeks (P = .75), showing no treatment effect. Measured endogenous thrombin potential did not correlate with CTC number. No bleeding-related serious adverse events (SAEs) occurred.

Conclusion: The baseline CTC numbers were lower than expected, decreasing the ability to detect an impact of platelet inhibition on CTCs. Clopidogrel and aspirin were well tolerated. Future studies evaluating the potential therapeutic role of antiplatelet therapy in breast cancer remain of interest, and they may be informed by these results.
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http://dx.doi.org/10.1016/j.clbc.2013.08.006DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3949605PMC
December 2013

Endocrine resistance in breast cancer: molecular pathways and rational development of targeted therapies.

Future Oncol 2012 Mar;8(3):273-92

Washington University School of Medicine in Saint Louis, Department of Medicine, Divisions of Hematology & Oncology, St Louis, MO, USA.

Endocrine resistance presents a major challenge in the management of estrogen receptor (ER)-positive breast cancer and is an area under intense investigation. Although the underlying mechanism is still poorly understood, many studies point towards the 'cross-talk' between ER and growth factor receptor signaling pathways as the key in the development of estrogen-independent growth in breast cancer. This review aims to provide the reader our current understanding of various molecular pathways that mediate endocrine resistance and that are being evaluated as therapeutic targets for ER-positive breast cancer. While most of the agents that target these pathways have only been tested in Phase I or small Phase II trials, some have shown encouraging results. A critical issue that remains is the development of research strategies and clinical trials that take into account the molecular heterogeneity of ER-positive breast cancer.
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http://dx.doi.org/10.2217/fon.12.8DOI Listing
March 2012

PARP inhibitors and their evolving role in breast cancer.

Oncology (Williston Park) 2011 Oct;25(11):1033-4

Division of Hematology/Oncology, Washington University School of Medicine, St. Louis, Missouri, USA.

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October 2011
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