Studies on the filterability of mouse sarcoma.

Conclusions

1. We have been successful in obtaining 34 mouse sarcoma No. 37 out of 105 injections, when supernatant fluid of cultures of Mouse Sarcoma No. 37, incubated anaerobically for 23 to 24 hours, was used.

2. The Berkfeldt filtrate of Mouse Sarcoma No. 37 also incubated anaerobically yielded 6 tumors out of 164 injected animals.

3. Tumor tissue incubated anaerobically does not seem to be suficiently viable to produce tumors when inoculated subcutaneously.

4. Mouse Carcinoma No. 63 yielded 2 tumors out of 81 injections of the supernatant fluid from incubated mouse carcinomata.

5. The filtered fluid from Mouse Carcinoma No. 63 so far has not produced a single successful tumor formation.