ITIL-306 in Advanced Solid Tumors

Key Inclusion Criteria: * Histologically documented advanced (metastatic and/or unresectable) disease as appropriate per cohort. * Phase 1a Dose Escalation: High-grade serous epithelial carcinoma of the ovary, fallopian tube, or peritoneum, adenocarcinoma of the lung, or clear-cell renal cell carcinoma. * Phase 1b Expansion: * Cohort 1: High grade serous, endometrioid, or clear cell epithelial carcinoma of the ovary, fallopian tube, or peritoneum. * Cohort 2: Squamous-cell carcinoma or adenocarcinoma of the lung. * Cohort 3: Clear cell or papillary RCC. * Disease must have unequivocally progressed during or after at least 1 prior line of systemic therapy that must include the following parameters (by indication): * Phase 1a dose escalation and Phase 1b Cohort 1: Participants with EOC whose disease has progressed during or after 1 prior line (at least 4 cycles) of platinum-based chemotherapy and had disease progression within 6 months from the last dose of the platinum agent. Participants who received 2 or more lines of platinum therapy must have disease which has progressed on or within 6 months after the date of the last dose of the platinum agent. Participants with BRCA-mutated EOC must have received previous PARP inhibitor therapy. * Phase 1a dose escalation and Phase 1b Cohort 2: Participants with NSCLC whose disease has progressed after 1 prior line of platinum-based doublet chemotherapy and a CPI. Participants with targetable mutations (e.g. EGFR/ALK/KRAS) are required to have progressed on targeted therapy in addition to a platinum-based doublet chemotherapy * Phase 1a dose escalation and Phase 1b Cohort 3: Participants with RCC whose disease has progressed after 1 prior line of antiangiogenic therapy and a PD-1-axis inhibitor. * Medically suitable for surgical resection of tumor tissue * Following tumor resection for TIL harvest, will have, at minimum, 1 remaining measurable lesion as identified by CT or MRI per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 * Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1 * Adequate bone marrow and organ function Key Exclusion Criteria: * History of another primary malignancy within the previous 3 years * Phase 1a: * EOC of the following subtypes: low-grade, endometrioid, clear cell, mucinous, sarcomatous, or mixed. * NSCLC of the following subtypes: squamous, neuroendocrine differentiation. * RCC of the following subtypes: nonclear-cell RCC * Phase 1b: * Cohort 1: Participants with mucinous, sarcomatous, and low-grade EOC. * Cohort 2: Participants with small cell lung cancer, or NSCLC with neuroendocrine differentiation * Cohort 3: Participants with nonclear-cell RCC, except papillary RCC * Previously received an allogeneic stem cell transplant or organ allograft * Previously received TIL or engineered cell therapy (eg, CAR T-cell) * Significant cardiac disease * Stroke or transient ischemic attack within 12 months of enrollment * History of significant central nervous system (CNS) disorder * Symptomatic and/or untreated CNS metastases * History of significant autoimmune disease within 2 years prior to enrollment * Known history of severe, immediate hypersensitivity reaction attributed to cyclophosphamide, fludarabine, dimethyl sulfoxide (DMSO), human serum albumin (HAS), phosphate buffer or gentamycin