Document zQ26qR5pJ0oRJNryVj7GOnyz0

174 OCCUPATIONAL TUMORS AND ALLIED DISEASES NUMBER OF DEATHS IN DECENNIAL GROUPS FROM MOLE SPINNERS' CANCER (Henry) Site Years 25-34 35-44 45-54 55-64 65-74 75-84 85- Total Scrotal 1 20 Percentage 25 80 87 131 83 22 87 81.9 66.4 64.7 1 345 100 76.8 Non-scrotal Percentage 3 75 5 20 13 29 42 12 13 18.1 33-6 35-3 -- 104 -- 23.2 Total 4 25 100 160 125 34 1 449 Henry could show by an analysis of the age at death from cutaneous cancer of mule spinners during the successive quinquennial periods of the 25 years (1911-1935), that the average age at death increased up to 12 years from 1911-15 to 1930-35. The following two tables were furnished by Henry in support of his observation: AGE AT DEATH FROM SCROTAL CANCER IN MULE SPINNERS 1 00 Co l Years No. of Deaths Aver age 30- 35- 40- 45- 50- 55- 60- 65- 70- 75- 80- 1911-15 1916-20 1921-25 1926-30 1931-35 Total 40 56 77 92 80 345 54.2 65.2 58.3 60.8 63-5 I 3 I 2 I I 2 2 II 12 6 3 3 6 II 18 9 5 3 3 IO 14 12 17 7 9 3 2 7 14 19 13 20 IO 6 2 6 6 15 io 12 14 13 '0v1 1 59-4 I 8 12 31 76 44 39 22 I I AGE AT DEATH FROM CUTANEOUS NON-SCROTAL CANCER IN MULE SPINNERS Years No. of Deaths Aver age 25- 30- 35- 40- 45- 50- 55- 60- 65- 70- 75- 80-- 85- 1911-15 1916-20 1921-25 1926-30 I93I-35 Total i5 19 23 24 23 104 54.6 5 8.6 62.0 67.0 66.7 62.0 I I 2 22 3I3I I 22 54 4I I I3 4463 I II 2 I 9 45 I I I 2 3 6 62 2 2 2 3 5 8 16 13 24 18 8 4 The interpretation of this observation must be postponed. until additional data are available. It cannot be concluded from this evidence that the potency of the carcinogenic hazard has been reduced and has caused a considerable lengthening of the exposure time. It is just as possible that the age at which the workers enter the hazardous operations has been advanced during recent