The prognostic role of comorbidity in salivary gland carcinoma.

Background: Patients with head and neck cancer are prone to develop significant comorbidity mainly because of the high incidence of tobacco and alcohol abuse, both of which are etiologic and prognostic factors. However, to the authors' knowledge little is known regarding the prognostic relevance of comorbidity in patients with salivary gland cancer.

Methods: A retrospective cohort of 666 patients with salivary gland cancer was identified within the Dutch Head and Neck Oncology Cooperative Group database.

Facial nerve function in carcinoma of the parotid gland.

Aim: To analyse, for patients with carcinoma of the parotid gland, the prognostic value for treatment outcome of the function of the facial nerve (NVII), and determining facial nerve dysfunction after treatment.

Methods And Materials: In a retrospective study of the Dutch head and Neck cooperative group (NWHHT), data of 324 patients with parotid carcinoma were analysed. The function of N VII before treatment was intact in 77%, partially and completely impaired in 14% and 7%, respectively.

The role of radiotherapy in the treatment of malignant salivary gland tumors.

Purpose: We analyzed the role of primary and postoperative low linear energy transfer radiotherapy in 538 patients treated for salivary gland cancer in centers of the Dutch Head and Neck Oncology Cooperative Group, in search for prognostic factors and dose response.

Methods And Materials: The tumor was located in the parotid gland in 59%, submandibular gland in 14%, oral cavity in 23%, and elsewhere in 5%. In 386 of 498 patients surgery was combined with radiotherapy, with a median dose of 62 Gy.

Salivary gland carcinoma: independent prognostic factors for locoregional control, distant metastases, and overall survival: results of the Dutch head and neck oncology cooperative group.

Background: We analyzed the records of patients with malignant salivary gland tumors, as diagnosed in centers of the Dutch Head and Neck Oncology Cooperative Group, in search of independent prognostic factors for locoregional control, distant metastases, and overall survival.

Methods: In 565 patients, we analyzed general results and looked for the potential prognostic variables of age, sex, delay, clinical and pathologic T and N stage, site (332 parotid, 76 submandibular, 129 oral cavity, 28 pharynx/larynx), pain, facial weakness, clinical and pathologic skin involvement, histologic type (WHO 1972 classification), treatment, resection margins, spill, perineural and vascular invasion, number of neck nodes, and extranodal disease. The median follow-up period was 74 months; it was 99 months for patients who were alive on the last follow-up.

Prognostic index for patients with parotid carcinoma: external validation using the nationwide 1985-1994 Dutch Head and Neck Oncology Cooperative Group database.

Background: Validation of the prognostic indices for the recurrence-free interval of patients with parotid carcinoma, the development of which was described in a previous report, is needed to be confident of their generalizability and justified prospective use.

Methods: The Dutch Cooperative Group on Head and Neck Cancer database contains 231 patients with parotid carcinoma from six tertiary referral centers who were seen between 1985-1994. This database was used to validate the predictive value of the prognostic indices, PS1 (pretreatment index predicting recurrence) and PS2 (posttreatment index predicting recurrence), in patients with parotid carcinoma.