Study Treatment Period (Year from-to) Total  number of patients No. of patients with Oropharyngeal Primary Benefit with xerostomia scores? SIGN Evidence      Level Saarilahti et al. [29] 2000-2004 18 14 Yes 3 Murdoch-Kinch et al. [30] 1995-2005 148¥ Not specified Yes 2 ¥ Only 124 patients had pre RT saliva flow rate measurement, 46 had measurements at 2 years follow up.

Table 2: Studies reporting on submandibular salivary gland sparing IMRT.