Radiation esophagitis-related pain, 4 weeks from the start of treatment as measured by the Numerical Rating Pain Scale for pain on swallowing (NRPS) Baseline and 4 weeks from the start of treatment [clinicaltrials_resource:296a3a3c8e6b3625b0f8d6570d40e3cf]

Arm 1: Standard supportive care (Viscous lidocaine and magnesium aluminum oxide (Maalox®); Liquid or solid oxycodone)

Radiation esophagitis-related pain, 4 weeks from the start of treatment as measured by the Numerical Rating Pain Scale for pain on swallowing (NRPS) Baseline and 4 weeks from the start of treatment [clinicaltrials_resource:296a3a3c8e6b3625b0f8d6570d40e3cf]

Arm 1: Standard supportive care (Viscous lidocaine and magnesium aluminum oxide (Maalox®); Liquid or solid oxycodone)