GCC Agonist Signal in the Small Intestine

Inclusion Criteria: * Scheduled for clinically indicated esophagogastroduodenoscopy (EGD) * Age \>= 18 years of age. Note: Because no dosing or adverse event (AE) data are currently available on the use of plecanatide or linaclotide in participants \< 18 years of age, children and adolescents are excluded from this study but will be eligible for future pediatric trials, if applicable * Willing to provide mandatory biospecimens as specified in the protocol * Eastern Cooperative Oncology Group (ECOG) performance status =\< 2 * Not pregnant or breastfeeding, as determined by pregnancy test prior to EGD procedure. Note: The effects of plecanatide and linaclotide on the developing human fetus at the recommended therapeutic dose are unknown. For this reason, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for 2 weeks after discontinuing study agent. Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her study physician immediately. Breastfeeding should be discontinued if the mother is treated with plecanatide or linaclotide * Ability to understand and the willingness to sign a written informed consent document * Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial * For patients with evidence of chr…