A Study to Evaluate the Incidence of Clinically Suspicious Lambert-Eaton Myasthenic Syndrome (LEMS) in Subjects Diagnosed With Small Cell Lung Cancer (SCLC)

This is a multi-center observational study in subjects with a diagnosis of small cell lung cancer. All eligible subjects enrolled will undergo a brief, symptom directed neurological evaluation and VGCC antibody testing (to be performed at a participating Quest laboratory). The results (positive/negative) of VGCC antibody testing will be documented as well as the receptor type P, Q or N. These tests will be repeated quarterly (Q3 months) for the duration of the study. If at any visit the subject is found to be BOTH neurologically suggestive of having LEMS and the VGCC Ab test is positive, then the subject is considered to be Clinically Suspicious of having LEMS. At any visit if a subject meets the criteria of Clinically Suspicious of LEMS. the end of study visit will be completed. Once the End of study visit is completed no further treatment information will be collected.