Girard et al. (A-51) conducted a study to identify prognostic factors of improved survival after resection of isolated pulmonary metastases (PM) from colorectal cancer. Among the data collected were the following regarding number of resected PM, survival, and outcome for 77 patients who underwent a complete resection at the first thoracic operation:

Number of Number of Resected Survival Resected Survival Patient PM (Months) Status Patient PM (Months) Status 1 1 24 Alive 8 1 15 Dead 2 1 67 Alive 9 1 10 Dead 3 1 42 Alive 10 1 41 Dead 4 1 28 Dead 11 1 41 Dead 5 1 37 Dead 12 1 27 Dead 6 1 133 Alive 13 1 93 Alive 7 1 33 Dead 14 1 0 Dead 15 1 60 Dead 47 1 54 Dead 16 1 43 Dead 48 1 57 Alive 17 1 73 Alive 49 1 16 Dead 18 1 55 Alive 50 1 29 Dead 19 1 46 Dead 51 1 14 Dead 20 1 66 Alive 52 1 29 Dead 21 1 10 Dead 53 1 99 Dead 22 1 3 Dead 54 1 23 Dead Number of Number of Resected Survival Resected Survival Patient PM (Months) Status Patient PM (Months) Status 23 1 7 Dead 55 1 74 Alive 24 1 129 Alive 56 1 169 Alive 25 1 19 Alive 57 1 24 Dead 26 1 15 Dead 58 1 9 Dead 27 1 39 Alive 59 1 43 Dead 28 1 15 Dead 60 1 3 Alive 29 1 30 Dead 61 1 20 Dead 30 1 35 Alive 62 1 2 Dead 31 1 18 Dead 63 1 41 Dead 32 1 27 Dead 64 1 27 Dead 33 1 121 Alive 65 1 45 Alive 34 1 8 Dead 66 1 26 Dead 35 1 24 Alive 67 1 10 Dead 36 1 127 Alive 68 1 143 Alive 37 1 26 Dead 69 1 16 Dead 38 1 7 Dead 70 1 29 Alive 39 1 26 Dead 71 1 17 Dead 40 1 17 Dead 72 1 20 Dead 41 1 18 Dead 73 1 92 Alive 42 1 17 Dead 74 1 15 Dead 43 1 10 Dead 75 1 5 Dead 44 1 33 Dead 76 1 73 Alive 45 1 42 Alive 77 1 19 Dead 46 1 40 Alive