Table 2.
Frequency of cancer, according to sex and to age group, in children served by the Instituto Mexicano del Seguro Social and treated in hospitals in Mexico City (1996–2001).
| Diagnostic group | Age group (years) | Sex | |||||||||||
| < 1 | 1–4 | 5–9 | 10–14 | Male | Female | Ratio | |||||||
| N | % | n | % | n | % | n | % | n | % | n | % | M/F | |
| I. Leukemias | 24 | 27.9
|
301 | 48.0
|
246 | 50.5
|
213 | 42.4
|
412 | 46.6
|
372 | 45.5
|
1.1 |
| II. Lymphomas* | 0 | 0.0 | 49 | 7.8 | 79 | 16.2
|
66 | 13.2
|
138 | 15.6
|
56 | 6.8 | 2.5 |
| Hodgkin disease | 0 | 0.0 | 7 | 1.1 | 26 | 5.3 | 32 | 6.4 | 43 | 4.9 | 22 | 2.7 | 1.9 |
| Non-Hodgkin lymphoma | 0 | 0.0 | 42 | 6.7 | 53 | 10.9 | 34 | 6.8 | 95 | 10.7 | 34 | 4.1 | 2.8 |
| III. CNST | 6 | 7.0 | 69 | 11.0
|
59 | 12.1
|
63 | 12.5 | 84 | 9.5
|
113 | 13.8
|
0.7 |
| IV. SNST | 9 | 10.5 | 21 | 3.3 | 5 | 1.0 | 4 | 0.8 | 20 | 2.3 | 19 | 2.3 | 1.1 |
| V. Retinoblastoma | 15 | 17.4
|
56 | 8.9
|
1 | 0.2 | 1 | 0.2 | 34 | 3.8 | 39 | 4.8 | 0.9 |
| VI. Renal Tumors | 7 | 8.1 | 44 | 7.0 | 15 | 3.1 | 5 | 1.0 | 39 | 4.4 | 32 | 3.9 | 1.2 |
| VII. Hepatic Tumors | 7 | 8.1 | 11 | 1.8 | 7 | 1.4 | 5 | 1.0 | 13 | 1.5 | 17 | 2.1 | 0.8 |
| VIII. Bone Tumors | 0 | 0.0 | 6 | 1.0 | 26 | 5.3 | 65 | 12.9
|
43 | 4.9 | 54 | 6.6 | 0.8 |
| IX. Soft Tissue Sarcomas | 5 | 5.8 | 29 | 4.6 | 23 | 4.7 | 32 | 6.4 | 43 | 4.9 | 46 | 5.6 | 0.9 |
| X. Germ Cell Tumors | 13 | 15.1
|
38 | 6.1 | 19 | 3.9 | 40 | 8.0 | 49 | 5.5 | 61 | 7.5
|
0.8 |
| XI. Carcinomas | 0 | 0.0 | 3 | 0.5 | 7 | 1.4 | 8 | 1.6 | 9 | 1.0 | 9 | 1.1 | 1.0 |
| Total | 86 | 100 | 627 | 100 | 487 | 100 | 502 | 100 | 884 | 100 | 818 | 100 | 1.1 |
* 40 cases of Histiocytosis were not included M: male; F: female Numbers in circles indicate the three highest frequencies, in descending order CNST: central nervous system tumors SNST: sympathetic nervous system tumors