| Type of cancer |
Comparative
studies (N) |
Type of comparative study |
Total number of patients in comparative studies |
| Randomized Controlled Trial |
Non-randomized
controlled trial |
Cohort
study |
Case-control
study |
Other |
| Bile duct [18-22] |
5 |
2 |
0 |
2 |
1 |
0 |
327 |
| Breast [35] |
1 |
1 |
0 |
0 |
0 |
0 |
68 |
| Cervical [41-43] |
3 |
1 |
2 |
0 |
0 |
0 |
99 |
| Esophageal - early [50] |
1 |
0 |
0 |
1 |
0 |
0 |
88 |
| Esophageal – advanced/
inoperable [51,74,75] |
3 |
1 |
0 |
1 |
0 |
1 |
251 |
| Gastrointestinal [95] |
1 |
0 |
1 |
0 |
0 |
0 |
11 |
| Head and neck –
nasopharyngeal [101] |
1 |
1 |
0 |
0 |
0 |
0 |
30 |
| Lung [133-141] |
9 |
2 |
0 |
7 |
0 |
0 |
597* |
| Mesothelioma [160,161] |
2 |
1 |
1 |
0 |
0 |
0 |
62 |
| Skin – basal cell [175-183] |
9 |
9 |
0 |
0 |
0 |
0 |
942 |
| Skin – squamous [184-186] |
3 |
1 |
2 |
0 |
0 |
0 |
288 |
| Skin – Bowen [187-189] |
3 |
3 |
0 |
0 |
0 |
0 |
96 |
| Skin – multiple (non-melanoma)
[190] |
1 |
1 |
0 |
0 |
0 |
0 |
23 |
| Vulval [257,258] |
2 |
0 |
1 |
1 |
0 |
0 |
226 |
| Total |
44 |
23 |
7 |
11 |
1 |
1 |
3108 |
*Number of patients not reported for one study (reported number of lesions instead)