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728 Chapter 16: Summaries<br />

Table 1. Strategies to overcome barriers to better DFS for patients with solid tumors (continues<br />

Barrier Strategies<br />

1) Drug resistance<br />

(native <strong>and</strong> acquired)<br />

• Identify molecular basis of resistance <strong>and</strong> develop bypass<br />

of resistance mechanism<br />

• Explore new drugs in high dose therapy (HDRx)<br />

• Use HDRx in first complete remission (CR1)<br />

• Give noncytotoxic therapy after HDRx<br />

• Develop novel therapies<br />

2) Sanctuary site • Introduce irradiation therapy (RT) into the treatment plan<br />

• Include drugs that penetrate <strong>blood</strong>-brain barrier<br />

3) Tumor burden • Administer more chemotherapy before HDRx<br />

4) Cell cycle dependent drug<br />

sensitivity (see native drug<br />

resistance)<br />

5) Dose limiting toxicity (DLT)<br />

of HDRx regimens<br />

6) Tumor contamination<br />

of stem cell product<br />

7) Tissue oxygenation<br />

• Add RT to sites of "former" bulk disease after HDRx<br />

•Try HDRx in CR1<br />

• Use maintenance therapy after HDRx<br />

• Explore novel Rx in setting of minimal residual disease<br />

(MRD)<br />

• Give multiple courses of sub-maximal tolerable dose<br />

(MTD) HDRx<br />

• Try molecular regulators of cell cycle<br />

• Add maintenance therapy after HDRx<br />

• Explore drugs to reduce DLT of MTD<br />

1<br />

Reevaluate purging in vivo:<br />

1<br />

- Positive selection<br />

- Negative depletion<br />

Subvert resistance due to hypoxia<br />

1<br />

Produce tumor cell hypoxia<br />

8) Neutropenic infections • Shorten aplasia<br />

• Use antibiotic prophylaxis

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