Fotodynamisk terapi med PhotoBarr er udelukkende undersøgt på patienter, som ikke lider af alvorlige medicinske tilstande såsom kongestiv hjerteinsufficiens i fremskredent stadium eller alvorlige lungetilstande, der kunne vanskeliggøre patientudvælgelsen til kirurgiske procedurer.
Photodynamic therapy with PhotoBarr has exclusively been studied in patients not suffering from severe medical conditions, such as congestive heart failure of advanced stage or serious pulmonary conditions that might impair the eligibility of patients for surgical procedures.