No, The cells were not tumorigenic in immunosuppressed mice, but did form colonies in semisolid medium.

(P59) diploid to hyperdiploid, hypertriploid to hypertetraploid with abnormalities including breaks, dicentrics and endoreduplication

78 years

The A-704 line was derived by D.J. Giard as indicated in the description for ATCC HTB-41.

Remove medium, rinse with fresh 0.25% trypsin solution, remove trypsin and let the culture sit at room temperature (or at 37C) until the cells detach (about 10 minutes).
Add fresh medium, aspirate and dispense into new flasks.
Subculture every 6 to 8 days.
Subcultivation ratio: A subcultivation ratio of 1:3 to 1:4 is recommended

Medium renewal: 2 to 3 times per week

23218: Giard DJ , et al. In vitro cultivation of human tumors: establishment of cell lines derived from a series of solid tumors. J. Natl. Cancer Inst. 51: 1417-1423, 1973. PubMed:
24381: Fogh J . Cultivation, characterization, and identification of human tumor cells with emphasis on kidney, testis, and bladder tumors. Natl. Cancer Inst. Monogr. 49: 5-9, 1978. PubMed: 571047