(HealthDay News) -- Here are the latest clinical trials, courtesy of CenterWatch:

Solid Tumors

If you are a non-smoker with adequate hepatic, kidney and bone marrow function, you may be eligible for this study.

The research site is in Santa Monica, Calif.

More information

Please see http://www.centerwatch.com/patient/studies/cat424.html.

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Constipation

If you are 18 or older and have chronic constipation, you may be eligible for this study.

The research site is in Bethesda, Md.

More information

Please see http://www.centerwatch.com/patient/studies/cat247.html.

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Rheumatoid Arthritis

If you have rheumatoid arthritis, at least six tender joints and at least six swollen joints, and have not responded well to etanercept or adalimumab, you may be eligible for this study.

The research site is in Tulsa, Okla.

More information

Please see http://www.centerwatch.com/patient/studies/cat132.html.

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