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For question(s) or comment(s) about the CDAS website, or to contact someone at CDAS, fill out the form below. Your message will be forwarded to the party best able to address your concern(s). If you are unable to use the form, you may send an email to cdas@imsweb.com (for data-only requests) or cdas-eems@imsweb.com (for biospecimens requests).

If you are a PLCO Participant or Relative: PLCO participant information can be updated by emailing the Central Data Collection Center at PLCO_CDCC_Fieldroom@westat.com.