No current peripheral neuropathy > grade 2 at time of randomization Peripheral neuropathy Grade ? 2 Peripheral neuropathy of any etiology that exceeds grade 1 Patients must not have baseline peripheral neuropathy that exceeds grade 1 =< grade 2 peripheral neuropathy; patients with grade 1 peripheral neuropathy with pain will be excluded =< grade 2 peripheral neuropathy Peripheral neuropathy >= 2 Grade >= 2 peripheral neuropathy Patients with a baseline peripheral neuropathy >= grade 2 will not be eligible Patients with preexisting grade II peripheral neuropathy Peripheral neuropathy ? Grade 2. Grade >= 2 peripheral neuropathy at the present time Peripheral neuropathy of Grade 2 within 3 weeks prior to the first study therapy Peripheral neuropathy ?grade 3. Peripheral neuropathy >= grade 2 at screening Peripheral neuropathy > Grade 2 despite supportive therapy. Participants with >= grade 2 peripheral neuropathy Baseline peripheral neuropathy of severity > grade 1 Presence of >= grade 2 peripheral neuropathy Peripheral neuropathy >= grade 2 Presence of peripheral neuropathy > grade 1 Peripheral neuropathy =< grade 1 at the time of registration Presence of > grade 1 peripheral neuropathy Peripheral neuropathy >Grade 2 Patients must not have peripheral neuropathy ? grade 2 Grade >= 2 peripheral neuropathy Peripheral neuropathy > grade 1 Peripheral neuropathy > CTCAE grade 1 Clinically significant (>= grade 2) peripheral neuropathy at the time of study entry Peripheral neuropathy grade > 1 Has greater than Grade 1 peripheral sensory neuropathy or > Grade 1 peripheral motor neuropathy graded according to the Modified (\Balis\) Pediatric Scale of Peripheral Neuropathies. CTCAE grade >= 2 peripheral neuropathy is NOT permitted Effects of any other prior therapies not reverted to ? Grade 1 (or ? Grade 2 for alopecia and peripheral neuropathy). Active >= grade 3 peripheral neuropathy Peripheral neuropathy > grade 1 Patients with > grade 1 peripheral neuropathy Peripheral neuropathy grade 1 or less. No peripheral neuropathy Baseline grade II peripheral neuropathy Current peripheral neuropathy >= grade 2 Peripheral neuropathy >= grade 2 at screening Patients with a peripheral neuropathy > grade 1 Peripheral neuropathy >= grade 2 Baseline grade II peripheral neuropathy Patients with a peripheral neuropathy > grade 1 ENTRECTINIB EXCLUSION CRITERIA: Peripheral neuropathy >= grade 2 Grade >= 2 peripheral neuropathy at baseline (within 21 days prior to cycle 1 day 1) Patients with peripheral neuropathy of > grade 1 No peripheral neuropathy >= grade 2 at baseline Peripheral neuropathy, if present, should be =< grade 1 Peripheral neuropathy > grade 1 if due to brentuximab vedotin or any peripheral neuropathy > grade 2 Peripheral neuropathy grade 0-2 Patients with preexisting peripheral neuropathy >= grade 2 are ineligible Patients with grade >= 2 peripheral neuropathy For the bortezomib arm of the study, patients with grade >= 2 peripheral neuropathy Peripheral neuropathy > grade 1 Peripheral neuropathy >= grade 1 Has > Grade 1 peripheral sensory neuropathy or > Grade 1 peripheral motor neuropathy graded according to the Modified (\Balis\) Pediatric Scale of Peripheral Neuropathies CTCAE v4 Grade ?2 peripheral neuropathy Grade >= 2 peripheral neuropathy Preexisting peripheral neuropathy is not allowed from any cause Grade >= 2 peripheral neuropathy >= grade 2 peripheral neuropathy Peripheral neuropathy >= grade 2 despite supportive therapy Patients with existing grade 3 or 4 peripheral neuropathy Peripheral neuropathy >= grade 2 at baseline OR peripheral neuropathy >= grade I with neuropathic pain Patients with grade 3/4 peripheral neuropathy Patients who have baseline peripheral neuropathy >= grade 2 are not eligible Grade > 2 peripheral neuropathy at baseline (within 14 days prior to cycle 1 day 1) Subject has >= grade 2 peripheral neuropathy Peripheral neuropathy >= grade 2 Patients with > grade 1 peripheral sensory neuropathy or > grade 1 peripheral motor neuropathy graded according to the Modified (“Balis”) Pediatric Scale of Peripheral Neuropathies are not eligible Peripheral neuropathy >= grade 2 Peripheral neuropathy >= grade 2 Peripheral neuropathy =< grade 1 >= grade 2 peripheral neuropathy >= grade 2 peripheral neuropathy within 14 days before beginning maintenance therapy Patients with >= grade 2 peripheral neuropathy Patients must not have peripheral neuropathy >= grade 2 Patients with peripheral neuropathy > grade 2 regardless of etiology Has peripheral neuropathy ? Grade 2. Peripheral neuropathy =< grade 1 Has peripheral neuropathy ? Grade 2 Subjects with baseline peripheral neuropathy that exceeds grade 1 Significant symptoms (grade >= 2) peripheral neuropathy Peripheral neuropathy ? Grade 3 or ? Grade 2 with pain within 2 weeks prior to first dose Peripheral neuropathy ? Grade 2 Peripheral neuropathy ? Grade 2. Has peripheral neuropathy ? Grade 2 Current Grade >1 peripheral neuropathy Grade ? 2 peripheral neuropathy Peripheral neuropathy < grade 2 Grade >= 2 peripheral neuropathy Current Grade >1 peripheral neuropathy from any cause Patients must not have peripheral neuropathy > grade 2 Peripheral neuropathy exclusions ? Grade 2 peripheral neuropathy Baseline peripheral neuropathy/paresthesia grade >= 1 Serious peripheral neuropathy. Peripheral neuropathy ? Grade 2. Previous diagnosis of diabetic neuropathy or peripheral neuropathy from any cause Participants who have more than grade 1 peripheral neuropathy Peripheral neuropathy >= grade 2 Peripheral neuropathy < grade 2 Clinically significant peripheral neuropathy Has baseline peripheral neuropathy/paresthesia grade ? 1. Evidence of peripheral neuropathy of Grade >2. Subject has peripheral neuropathy ? grade 2. Peripheral neuropathy >= grade 1 Grade 3 or above peripheral neuropathy Peripheral neuropathy: must be =< grade 1 Grade > 2 peripheral neuropathy at baseline Grade >= 2 peripheral neuropathy within 14 days prior to cycle 1 day 1 Patients with existing peripheral neuropathy grade > 2 Peripheral neuropathy =< grade 1 at the time of registration Grade >= 2 peripheral neuropathy within 14 days prior to initiation of therapy Subject has peripheral neuropathy >= grade 2. Presence of peripheral neuropathy ? CTCAE Grade 2 Peripheral neuropathy ? Grade 2 despite supportive therapy Has baseline peripheral neuropathy/paresthesia COHORT II: Patients must not have >= grade 2 peripheral neuropathy Peripheral neuropathy > Grade 2. Peripheral neuropathy >= grade 2 at baseline OR peripheral neuropathy >= grade I with neuropathic pain Peripheral neuropathy: must be =< grade 1 Grade 2 or more peripheral neuropathy Peripheral neuropathy of grade >=3. Patients with painful grade 2 neuropathy are also excluded Peripheral neuropathy ? Grade 2 Peripheral neuropathy >= grade 3 No ? grade 2 peripheral neuropathy. CTCAE version 4.03 > grade 3 peripheral neuropathy Peripheral neuropathy =< grade 1 Peripheral neuropathy >= grade (Gr) II Peripheral neuropathy =< grade 1 Peripheral neuropathy >/= Grade 2 (NCI-CTC Version 3.0) Grade 3 peripheral neuropathy Patients with peripheral neuropathy of grade >= 3; patients with painful grade 2 neuropathy are also excluded Peripheral neuropathy Peripheral neuropathy > grade 2 > grade 2 peripheral neuropathy at baseline Presence of ? Grade 2 peripheral neuropathy Peripheral neuropathy ? Grade 3. Presence of clinically significant non-hematological toxicity of prior chemotherapy that has not resolved to ? Grade 1 as determined by CTCAE v 4.0, with the exception of alopecia and peripheral neuropathy. Note: Peripheral neuropathy > Grade 2 plus pain, or Grade 3 or Grade 4 are excluded. Presence of > Grade 1 peripheral neuropathy Peripheral neuropathy CTCAE Grade ?2 Peripheral neuropathy ? Grade 2 Patients with peripheral neuropathy > 2 Baseline peripheral neuropathy ? grade 2. Peripheral neuropathy ? grade 2. Grade >= 2 peripheral neuropathy Patients with grade >= 2 peripheral neuropathy will not be permitted on study Patients with preexisting peripheral neuropathy grade >= 2 will not be eligible Evidence of peripheral neuropathy of Grade > 2 Subjects with > grade 1 peripheral neuropathy Patients with > grade 2 neuropathy according to the Modified (“Balis”) Pediatric Scale of Peripheral Neuropathies will be excluded except in cases in which neuropathy is secondary to prior surgery Peripheral neuropathy Grade >/=2 Subjects with preexisting Grade 3 or 4 neuropathy. Any peripheral neuropathy must recover to Grade less than or equal to 2 before enrollment Presence of peripheral neuropathy Subjects with Grade >2 peripheral neuropathy Peripheral neuropathy at study entry Peripheral neuropathy CTCAE v4.03 Grade ? 3 Patients with peripheral neuropathy >= grade 2 Peripheral neuropathy ? CTCAE Grade 2 at baseline. Patients who have grade >= 2 peripheral neuropathy Preexisting grade >= 2 peripheral neuropathy Patients with peripheral neuropathy >= grade 2 are not permitted unless discussed with the principal investigator and only in unique circumstances (i.e. unilateral neuropathy due to trauma) Ongoing Grade 3 or Grade 4 peripheral neuropathy, or Grade 2 peripheral neuropathy with pain despite appropriate interventions, within 28 days prior to first dose of study treatment. No grade >= 2 peripheral neuropathy Grade >=2 peripheral neuropathy Part 2 only: Patients with >= grade 2 peripheral neuropathy. Peripheral neuropathy ?Grade 2. >= grade 2 peripheral neuropathy Peripheral neuropathy Patients with a >= grade 2 peripheral neuropathy Current Grade >1 peripheral neuropathy History of peripheral neuropathy; (note: this does not apply to Cohort 3) Grade >=2 peripheral neuropathy Patients with peripheral neuropathy >= grade 2 Grade ?2 peripheral neuropathy at baseline (within 14 days prior to cycle 1 day 1). Peripheral neuropathy >= grade 2 Patient has > Grade 2 painful neuropathy or peripheral neuropathy Peripheral neuropathy ? Grade 2 Patients with peripheral neuropathy > grade 1 will be excluded from study participation History of peripheral neuropathy of ?grade 2 Patients with symptomatic peripheral neuropathy> Grade 1. Peripheral neuropathy > grade 1 (NCI-CTC). Peripheral neuropathy of > grade 2 severity. Peripheral neuropathy ? CTCAE grade 2 Peripheral neuropathy with grade =< 1 Clinically significant (>= grade 2) peripheral neuropathy at the time of study entry Peripheral neuropathy >= grade 1 Grade >= 2 peripheral neuropathy Patients must not have a history of peripheral neuropathy (regardless of cause) Any peripheral neuropathy >= grade 3 Patients with known, previously diagnosed peripheral neuropathy from causes other than chemotherapy Grade III or IV upper extremity peripheral neuropathy Self-report of >= 4 on the Peripheral Neuropathy Question Patients with known, previously diagnosed peripheral neuropathy from causes other than chemotherapy. History of peripheral neuropathy prior to receiving neurotoxic chemotherapy Pain or symptoms of peripheral neuropathy of > 3 month's duration attributed to chemotherapy-induced peripheral neuropathy Previous diagnosis of diabetic neuropathy or peripheral neuropathy from any cause No >= grade 2 peripheral neuropathy Peripheral neuropathy ? grade 2