| Group | Combinations | Sample size |
| Group 1 | Stage I, Grade 1, adeno | 11303 | Stage I, Grade 2, adeno | Stage I, Grade 2, squamous, female | Stage I, Grade 3, adeno, female | Stage I, Grade 4, adeno, female | |
| Group 2 | Stage I, Grade 1, squamous | 13431 | Stage I, Grade 2, squamous, male | Stage I, Grade 3, adeno, male | Stage I, Grade 3, squamous | Stage I, Grade 3, large cells, female | Stage I, Grade 4, adeno, male | Stage I, Grade 4, large cells | Stage II, Grade 1, adeno, female | Stage II, Grade 2, adeno, female | Stage II, Grade 2, squamous, female | |
| Group 3 | Stage I, Grade 1, squamous, male | 4522 | Stage I, Grade 3, large cells, male | Stage I, Grade 4, squamous, male | Stage II, Grade 1, adeno, male | Stage II, Grade 2, adeno, male | Stage II, Grade 2, squamous, male | Stage II, Grade 3, adeno | Stage II, Grade 3, squamous | Stage II, Grade 4, large cells | |
| Group 4 | Stage I, Grade 4, small cells | 4291 | Stage II, Grade 4, small cells | Stage III, Grade 1, adeno | Stage III, Grade 2, adeno | |
| Group 5 | Stage III, Grade 1, squamous | 24951 | Stage III, Grade 2, squamous | Stage III, Grade 3 | Stage III, Grade 4, adeno | Stage III, Grade 4, squamous, male | Stage III, Grade 4, large cells | Stage III, Grade 4, small cells | |
| Group 6 | Stage IV, Grade 1, adeno, male | 18215 | Stage IV, Grade 1, squamous, male | Stage IV, Grade 2, adeno | Stage IV, Grade 2, squamous, male | Stage IV, Grade 3, adeno, female | Stage IV, Grade 3, squamous, female | Stage IV, Grade 3, small cells | Stage IV, Grade 4, adeno | Stage IV, Grade 4, small cells | | Group 7 | Stage IV, Grade 2, squamous, female | 12237 | Stage IV, Grade 3, adeno, male | Stage IV, Grade 3, squamous, male | Stage IV, Grade 3, large cells | Stage IV, Grade 4, squamous, male | Stage IV, Grade 4, large cells | |
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