“…Since 1950, 49 patients (excluding those in the M. D. Anderson Cancer Center series) with such tumors have been reported, with histological confirmation by surgery. 2,3,7,[9][10][11][12][13]16,17,19,[24][25][26][27][28][32][33][34][35][36][37]42,45 The average age of 54 years at diagnosis (range 23-74 years) is similar to that found in both the present study (mean age 51 years) and in the only other published series of significant size reported by Perrin and colleagues 23,34 in 1982. Women outnumbered men in both series by 6:4, and the female/male ratio is 1.3:1 when all 59 cases now on record are considered.…”