A Study of Amivantamab Subcutaneous (SC) Administration for the Treatment of Advanced Solid Malignancies

The purpose of this study is to assess the feasibility of subcutaneous (SC) administration of amivantamab based on safety and pharmacokinetics and determine a dose, dose regimen and formulation for amivantamab SC delivery.

Inclusion criteria: * Part 1 and Part 2: Participant must have histologically or cytologically confirmed solid malignancy that is metastatic or unresectable and which may derive benefit from epidermal growth factor receptor (EGFR) or mesenchymal-epidermal transition tyrosine kinase receptor/hepatocyte growth factor receptor (cMet) directed therapy. Eligible tumor types include non-small cell lung cancer (NSCLC), squamous cell carcinoma of the head and neck (SCCHN), hepatocellular cancer (HCC), colorectal cancer (CRC), renal cell cancer (RCC), medullary thyroid cancer (MTC), gastroesophageal cancer (GEC), mesothelioma, breast cancer (BC) and ovarian cancer (OC). Participants must have either progressed after prior standard of care therapy for metastatic disease, be ineligible for, or have refused all other currently available therapeutic options. In cases where participants refuse currently available therapeutic options, this must be documented in the study records. * Participant must have Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 * A woman of childbearing potential must have a negative serum (beta-human chorionic gonadotropin \[beta-hCG\]) at Screening and a negative urine or serum pregnancy test within 24 hours before the first dose of study drug * A woman must agree not to donate eggs (ova, oocytes) for the purposes of assisted reproduction during the study and for 6 months after receiving the last dose of study drug * A man who is sexually active with a woman of childbearing potential must agree to use a condom and his partner must also be practicing a highly effective method of contraception (that is, established use of oral, injected or implanted hormonal methods of contraception; placement of an Intrauterine device \[IUD\] or Intrauterine system \[IUS\]) Exclusion criteria: * Participant has uncontrolled inter-current illness, including but not limited to poorly controlled hypertension or diabetes, ongoing or active systemic infection (that is, has discontinued all antibiotics for at least one week prior to first dose of study drug), diagnosed or suspected viral infection (except Human immunodeficiency virus \[HIV\] positive participants with 1 or more of the following: a) not receiving highly active antiretroviral therapy; b) a change in antiretroviral therapy within 6 months of the start of screening; c) cluster of differentiation 4 (CD4)+ T-cell count less than \[\