Table 2.
Characteristics of studies entered into the analysis in the 2 and 5-year survival rates in the high-grade astrocytoma group
| Author, year, reference | Country | Sample size total | 2-year survival % | 5-year survival % | Type of treatment | Quality |
|---|---|---|---|---|---|---|
| Lin, 2003, [11] | Taiwan | 45 | 73.3 | 64.4 | Radiation therapy | High |
| Fukushima, 1998, [15] | Japan | 17 | 29.4 | - | Chemotherapy | High |
| Nikpour, 2009, [10] | Iran | 13 | 69.2 | 38.5 | Radiation therapy | Medium |
| Davis, 1999, [27] | USA | 3128 | 36.2 | 27.6 | Surgical | High |
| North, 1990, [28] | Australia | 285 | 15.1 | - | Radiation therapy | High |
| Huddart, 1993, [16] | UK | 7 | - | 57.1 | Conservative surgery and radiotherapy | Medium |
| Salcman, 1982, [29] | USA | 74 | 25.7 | 20.3 | Chemotherapy and radiation therapy | High |
| Shahzadi-2, 1992, [8] | Iran | 8 | 62.5 | - | Radiation therapy | High |
| Aghajan, 2019, [30] | USA | 24 | 29.2 | - | Surgical | High |
| Barker, 2014, [24] | USA | 126 | 57.9 | - | Radiation therapy | High |
| Duffner-2, 1986, [31] | USA | 215 | - | 34.9 | Surgical | Medium |
| Okamoto-2, 2004, [32] | Switzerland | 35 | - | 16.4 | Radiation therapy | High |
| Shin, 2016, [33] | USA | 4807 | - | 29.8 | Chemotherapy and radiation therapy | High |
| Minniti, 2014, [25] | Italy | 97 | - | 38.1 | Chemotherapy and radiation therapy | Medium |
| Dey, 2014, [26] | USA | 241 | 19.6 | 10.0 | Surgical | High |