Treatment of nonmelanoma skin cancer at a large Australian center.

One thousand one hundred fifty-four cases of nonmelanoma skin cancer (NMSC) referred to the Consultative Skin Clinic at Peter MacCallum Cancer Institute (PMCI) (Melbourne, Australia) in 1980 were reviewed. The median age was 68 years, and the male to female ratio was 1.5:1. Final diagnosis was basal cell carcinoma (BCC) in 901 patients (78%), squamous cell carcinoma (SCC) in 242 patients (21%), and basosquamous carcinoma in 11 patients (1%). Seven hundred twelve (62%) were biopsy proven. Comparison of clinical and histologic diagnoses showed that BCC were correctly diagnosed clinically in 85% of cases but only 53% of SCC were correctly diagnosed. The distribution of sites was as follows: head and neck 871 (75%), limbs 131 (11%), trunk 50 (4%), and multiple sites 102 (9%). One thousand eighty-nine (94%) had primary lesions and 65 (6%) had recurrent lesions. The lesions were treated with surgery in 55% of cases, superficial radiotherapy in 39%, other types of radiotherapy in 3%, cryotherapy in 1%, and 5-fluorouracil in 0.2%. Recurrent lesions, lesions on the eyelids, ears or nose, and T4 lesions were significantly associated with increased failure rates. Superficial radiotherapy was associated with a 2.3-fold increase in failure rate compared to surgery when other prognostic factors were taken into account (P = 0.01, 95% confidence interval = 1.2-4.3). Nonsuperficial radiotherapy was associated with an 11.5-fold increase in failure rate compared to surgery (P less than 0.0001, 95% confidence interval = 4.9-27.1), but several of these cases were treated for palliative purposes only. The results of, and indications for treatment with surgery or radiotherapy at PMCI are discussed.