Table 1. Characteristics of the included studies.
| Study ID | Study type | Country | Number of patients | M/Fa | Median age (IQR)(years)b | Cancer type | Intervalc(days) | Number of patientsd |
| Assaad 2020 | Retrospective | France | 302 | 144/158 | 58.2# | Non-specific | 30 | 26 |
| Fox 2020 | Retrospective | UK | 55 | 38/17 | 63(23-88) | Hematological malignancies | 14 | 9 |
| Garassino 2020 | Retrospective | International | 200 | 141/59 | 68(61.8-75) | Thoracic cancer | 7 (median) | 34 |
| García-Suárez 2020 | Prospective | Spain | 697e | 413/277 | 72 (60-79) | Hematological malignancies | 30 | 44 |
| Jee 2020 | Retrospective | US | 309 | 119/150 | NAf | Non-specific | 35 | 18 |
| Lee 2020 | Prospective | UK | 800g | 449/349 | 69(59-76) | Non-specific | 28 | 44 |
| Lievre 2020 | Retrospective | France | 1289 | 795/494 | 67(19-100) | Solid cancer | 28 | 62 |
| Mehta 2020 | Retrospective | US | 218 | 127/91 | 69(10-92) | Non-specific | 30 | 5 |
| Mehta 2021 | Retrospective | India | 186 | 105/81 | 52(42–58.75) | Non-specific | 30 | 11 |
| Nakamura 2021 | Retrospective | Japan | 32 | 22/10 | 74.5(24–90) | Non-specific | 30 | 3 |
| Ozer 2021 | Retrospective | US | 68 | 37/31 | 72(23-91) | Non-specific | 28 | 2 |
| Pinato 2020 | Retrospective | International | 890 | 503/387 | 68# | Non-specific | 19 (mean) | 56 |
| Provencio 2021 | Prospective | Spain | 447 | 332/115 | 67.1# | Lung cancer | NA | 91 |
| Sanchez-Pina 2020 | Prospective | Spain | 39 | 23/16 | 64.7# | Hematological malignancies | NA | 3 |
| Stroppa 2020 | Retrospective | Italy | 25 | 20/5 | 71.64# | Non-specific | NA | 4 |
| Wang 2020 | Retrospective | US | 58 | 30/28 | 67 | Multiple myeloma | NA | 32 |
| Yang F 2020 | Retrospective | China | 52 | 28/24 | 63(34–98) | Solid cancer | 30 | 1 |
| Yang KY 2020 | Retrospective | China | 205 | 96/109 | 63(56–70) | Non-specific | 28 | 4 |
| Yarza 2020 | Prospective | Spain | 63 | 34/29 | 66# | Solid cancer | 28 | 8 |
| Zhang 2020 | Retrospective | China | 107 | 60/47 | 66(36-98) | Non-specific | 30 | 6 |
aM means males and F means females.
bIQR means interquartile range.
cInterval of immunotherapy before diagnosis of COVID-19.
dNumber of cancer patients receiving immunotherapy within 30 days before COVID-19 diagnosis.
eData are missing for 7 patients.
fNA means data not available.
g2 patients did not identify as either male or female.
#Mean age.